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Hesbus RS232 user guide.txt
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TABLE OF CONTENTS
TABLE OF CONTENTS
Introduction.......................................... 1
Set-Up Instructions................................... 2
Connecting the RS232 Peripheral..................... 3
Testing the Peripheral.............................. 4
Connecting Devices to the Peripheral................ 5
Operating the System.................................. 7
Using BASIC........................................ 7
Software Options.................................... 14
Recover from Errors................................... 21
Common Applications.................................. 22
Output to a printer on the parallel port............ 22
Exchanging Messages Between a Computer and a Video
Terminal.......................................... 22
Appendices ........................................... 24
A. Error Codes...................................... 24
B. Using Assembly Language.......................... 26
C. parity Options................................... 31
D. RS232 Cabling.................................... 32
E. parallel port Cabling............................ 34
Service Information.................................. 35
In Case of Difficulty............................... 35
Exchange Centers................................... 36
If You Have questions or Need Assistance............ 36
Copyright 1983 Texas Instruments Incorporated
INTRODUCTION
INTRODUCTION
The HX-3000 RS232 peripheral is a communications adaptor
that broadens the range of devices you can attach to
computers that use the TI HEX-BUS(tm) Intelligent Peripheral
Interface. This peripheral offers two versatile means of
connecting devices: the RS232 port and the optional parallel
port. The RS232 port lets you attach video display terminals,
modems, plotters, and other devices which follow the EIA
RS232C serial interface specification. The parallel port is
available for use with many of the popular computer printers
built for parallel interfacing.
As part of the expanding line of TI devices that use the HEX-
BUS interface (a standardized interconnection system with
uniform set of cabling conventions, control signals, and
message structures), the RS232 peripheral plugs directly into
any computer compatible with this interface system. '
This manual shows you how to connect and test the RS232
peripheral and presents the BASIC instructions that are used
to operate it. A description of the software options
(parameters that may be varied to configure the peripheral 1
communication with a variety of attached devices) follows
the section on BASIC. Some common applications of the
peripheral are given next, followed by a number of useful
appendices and a section of service information.
Explanations and examples of programming employ the
version of BASIC developed for the TI Compact Computer
Model CC-40. Users of other TI computers may note
differences in format between the BASIC statements shown
here and equivalent statements as used with their own
machines. Apart from that distinction, however, the material
in this manual applies to operation of the peripheral with an
computer compatible with the HEX-BUS interface.
SET-UP INSTRUCTIONS
SET-UP INSTRUCTIONS
Setting up the HX-3000 RS232 peripheral is a simple process
First the peripheral is attached to the HEX-BUS' interface.
Then its operation is tested. This section describes the steps
involved in each of these procedures. Information about
connecting other devices to the peripheral is also included.
Please read the material in this section completely before
you begin to set up the peripheral.
CAUTION
The electronic components of the RS232
peripheral can be damaged by discharges of static
electricity. To avoid damage, do not touch the
connector contacts or expose them to static
electricity.
After you have unpacked the RS232 peripheral, you are ready
to attach it to the HEX-BUS interface. Save the packing
material for storing or transporting the device.
The devices in the TI HEX-BUS(tm) Intelligent Peripheral
Interface system have identical eight-pin recessed
connectors for the cable through which they communicate.
The computer has one such connector, while each peripheral
has two of them so that a series of devices may be attached
to the computer. The first peripheral is plugged directly into
the computer, the second peripheral is cabled to the first,
and so on. The last peripheral has one connector free.
You may link devices to the computer in any order. Just plug
a new section of HEX-BUS interface cable into the available
connector and plug the other end of the cable into one of the
connectors on the new peripheral, as described on the next
page. The plugs are keyed so that you can insert them only
one way.
Peripherals are normally arranged in a stack next to the
computer, using the short sections of cable supplied with the
devices. Longer cables are available separately if you prefer
to arrange the peripherals differently.
SET-UP INSTRUCTIONS
Connecting the RS232 Peripheral
1. Turn off the computer.
2. If other peripherals are already attached to the HEX-BUS(tm)
interface, wait for their activity to cease. Then turn them
off.
3. Locate the device having the one available HEX-BUS
connector (either the last peripheral on the bus, or the
computer if no peripherals are attached yet). Holding that
device firmly, plug one end of the cable into the connector.
4. Place the RS232 peripheral in position and attach the other
end of the cable to either connector on this unit.
5. Attach the power cord to the small jack on the back of the
RS232 peripheral and plug the AC adapter model AC9201
(included with the peripheral) into a standard 115-vo1t
outlet. DO NOT CONNECT ANY OTHER ADAPTER TO THIS
PERIPHERAL.
CAUTION
To prevent damage, disconnect all devices before
moving any part of the HEX-BUS system. The
cables and connectors which link the computer
and peripherals are subject to accidental strain if
not detached. For shipment over long distances
repack the system securely, preferably in its
original packing materials.
SET-UP INSTRUCTIONS
Testing the Peripheral
Note: The following test procedure is used with the CC-40.
Computers other than the CC-40 may require different test
procedures from that listed below.
1. Turn on the RS232 peripheral and any other attached
peripherals first. Then turn on the computer.
Note: All peripherals must be turned on for proper
operation.
2. Type CALL IO(50,1) and press [ENTER]. The CALL IO
statement causes the I/O (Input/Output) indicator in the
computer display and the "working" light on the peripheral
to turn on for an instant. The message
I/O error 4 "50"
should then appear in the display as the ERROR indicator
comes on. This message tells you that the peripheral is
functioning correctly.
Note: CALL IO(50,1) is a command to close the parallel port
The peripheral has just been turned on at this point,
however, so the port is not yet open. In returning error
code 4 (device not open), the peripheral is operating as it
should.
3. Press [CLR] to clear the error message and restore the
cursor. The peripheral is now ready for use.
If the light does not come on, the device may not be
connected properly. Check the cable connections between
the computer and this peripheral. If a code other than "4" is
displayed, refer to appendix A.
If the I/O indicator stays on, check that all peripherals are
powered up. The computer cannot respond to input from the
keyboard while in this state. Turn the peripheral off
momentarily to clear the condition. Then check the cable
connections and try the operational check once more. If the
malfunction persists, see the In Case of Difficulty section of
this manual for further assistance.
SET-UP INSTRUCTIONS
Connecting Devices to the Peripheral
After the peripheral is connected to the HEX-BUS interface
and tested, additional devices can be attached to the RS232
and parallel ports.
The RS232 port is available for both input and output. It is
readily accessible at the back of the peripheral housing, next
to the two eight-pin HEX-BUS connectors. Just plug in the
RS232 cable from the other device.
Most devices built according to the Electronic Industries
Association (EIA) RS232C interface standard may be attached
to the RS232 port. To be sure that a given device is
compatible with the peripheral, check its user's manual for
specific variations within the standard. Appendix D contains
information about the RS232 cabling required by this
peripheral.
The optional parallel port is provided for output only. It
serves expressly as a connector for the numerous computer
printers that follow the parallel port protocol used in this
peripheral.
The parallel port is located inside the peripheral housing.
Peripherals equipped with this option have a permanently-
attached flat cable which passes beneath the RS232
connector and plugs directly to most printers.
SET-UP INSTRUCTIONS
Appendix E supplies reference information on the signal and
control lines used in the cable. Check the manual of the
printer you intend to connect to verify the compatibility of
that device with the parallel port.
If the Texas Instruments 99/4 Impact Printer Model PHP2500
is used on the parallel port, the RS232 board in the printer
must be removed. Refer to appendix D in the printer manual
(Setting DIP Switches) for instructions on removing the
RS232 board.
Note: RS232 peripherals sold without the parallel port option
can be equipped with this feature after purchase as well. If
you wish to have the parallel output capability added at
some point, contact Texas Instruments for further
information. The address and telephone numbers of the TI
Customer Relations Department are found in the If You Have
Questions or Need Assistance section of this manual.
OPERATING THE SYSTEM
OPERATING THE SYSTEM
After you have attached a device to the RS232 peripheral,
you can control the operation of the system from the
computer keyboard in one of several ways.
* You can operate peripherals with BASIC statements and
commands in programs of your own, as described in this
manual.
* You can use separately available Solid State Software(tm)
cartridges which allow you to access peripherals by
responding to prompts in prewritten programs for
engineering, science, business, and financial applications
* If you are using a CC-40 computer equipped with an
Editor/Assembler cartridge, you can control peripherals in
assembly language.
Appendix B gives an example of an assembly-language
application utilizing the RS232 port. For further information
on the use of Solid State Software or Editor/Assembler
cartridges with the RS232 peripheral, refer to the manuals for
those cartridges.
Using BASIC
The BASIC statements and commands which may be used
with the RS232 peripheral are summarized below. All of them
are implemented in the CC-40 computer. The CALL IO
statement may not be available in other TI computers.
* LIST-Prints or displays a copy of a program.
* OPEN, CLOSE-Begin and end the use of a device in a
program.
* INPUT, LINPUT, PRINT-Send and receive data. INPUT and
LINPUT are used only with the RS232 port, not with the
parallel port.
* CALL IO-Calls a subprogram which can be used to
communicate with peripherals. Allows greater control over
internal details of operations than is otherwise possible in
BASIC.
* EOF (End-of-File)-Tests whether a data file being input
contains additional records to be read. Seldom used with
this peripheral.
The OPEN statement must precede all of the other
statements and commands described above except for LIST
and CALL IO. These two instructions may be used
independently as well as after OPEN.
OPERATING THE SYSTEM
Statements and Commands
Statements are BASIC instructions within a program which
are executed when the program is run. Commands are BASIC
instructions outside a program which are executed
immediately. Every instruction belongs to one of these two
categories, though some overlap exists. On the next few
pages the BASIC statements and commands which can be
used with this peripheral are described.
The sample formats provided with each description are those
used with the CC-40 computer. Other TI computers
compatible with the HEX-BUS(tm) interface may use slightly
different BASIC formats.
The OPEN Statement
The OPEN statement prepares a BASIC program for
communication with peripheral devices. When used with this
peripheral, the OPEN statement links an attached device to
file number and sets functional parameters for the operation
of the RS232 or parallel port. The OPEN statement for this
peripheral has the following general form.
OPEN #file-number, "device-number [.software-options]
[, file-attributes]
File-number is a numeric expression that evaluates to an
integer between 1 and 255.
Device-number is the numeric designation of the peripheral
to be operated. Each peripheral has a number of its own. A
device on the RS232 port may have any number from 20
through 23. Numbers for devices on the parallel port may
range from 50 through 53.
Note: The device numbers for this peripheral are factory-set
at 20 for the RS232 port and 50 for the parallel port. You
never need to change them unless you use more than one
RS232 peripheral on the HEX-BUS(tm) interface. If your
applications do require more than one of these peripherals,
write to Texas Instruments Incorporated, RS232 Device
Codes, P.O. Box 53, Lubbock, Texas 79408 for information on
how to alter device numbers.
OPERATING THE SYSTEM
Software-options are a set of parameters that you may vary
to match the characteristics of this peripheral to those of
attached devices. If you choose not to vary them, these
parameters automatically assume certain settings called
default values. For further information, consult the Software
Options section of this manual.
File-attributes are optional keywords which define certain
features of the data file itself. For attributes not specified,
default values are assumed. These features are described
below.
- File organization-SEQUENTIAL is the only file
organization which may be used with the RS232 peripheral
This is the default value and need not be specified in the
OPEN statement. RELATIVE (random access) files cannot
be used.
- File type-It is possible for the HEX-BUS(tm) interface
system to process data either in ASCII (American Standard
Code for Information Interchange) characters as DISPLAY
files or in INTERNAL format. The DISPLAY file type,
however, is more useful in most applications with this
peripheral. DISPLAY is the default value and need not be
specified.
- Open mode-This entry determines whether the file may be
read from (INPUT), written to (OUTPUT), or both (UPDATE).
If you do not specify an open mode, the default is UPDATE.
Note: The RS232 port functions in all the above modes, but
the parallel port must be opened in OUTPUT mode. Neither
port may be opened in APPEND mode.
- Record type-Records are the blocks of data which make
up file contents. The HEX-BUS(tm) interface system uses
VARIABLE records whose length you can define. If no
length is specified, the RS232 peripheral supplies an
80-character default. You can set maximum record length
to either more or fewer than 80 characters by following the
keyword VARIABLE with a number (as in the first example
below). This feature is useful when, for instance, a printer
having a line length of other than 80 characters is attached
to the RS232 or parallel port.
OPERATING THE SYSTEM
Examples:
100 OPEN #l,"20.B=4800",OUTPUT,VARIABLE 132
Prepares a device on the RS232 port for operation.
Certain software options or file attributes are specified
while the rest (by being omitted from the OPEN
statement) retain their default values. The peripheral is
opened in DISPLAY format (by default) in OUTPUT
mode. Record length is set to 132 characters. This
length is appropriate for a device such as the TI 810
printer, which can print up to 132 characters per line.
110 OPEN #2,"50", OUTPUT
Enables a printer on the parallel port for operation.
OUTPUT is specified because the parallel port must be
opened in this mode. All other options are left at their
default values.
The term file generally refers to a collection of data stored in
a mass storage device such as the TI Wafertape(tm) peripheral
Although most devices accessible through the RS232
peripheral are display-type equipment not strictly oriented
towards use with files, the word is employed in this manual
for the sake of overall consistency and simplicity.
The CLOSE Statement
A device enabled for use with an OPEN statement must also
be closed when its use is ended. The CLOSE statement has
the following general form.
CLOSE #file-number
File number is the number specified in the associated OPEN
statement.
The INPUT Statement
When you use the INPUT statement with a device connected
to the RS232 port, data can be received from the device and
assigned to the variables listed in the statement. In this
application, the INPUT statement has the following general
form.
INPUT #file-number, variable-list
OPERATING THE SYSTEM
To use the INPUT statement with a device on the RS232 port
you must open the device in INPUT or UPDATE mode. The
amount of data taken depends on the transfer type and
record length established in the associated OPEN statement.
These constraints are detailed in the Software Options
section of the manual, under the heading Transfer Type.
Examples:
200 INPUT #3,B$
Puts the next character string available from the device
opened as #3 into the string variable B$.
210 INPUT #5,A,B,C
Puts the next three values from the device opened as #5
into variables A, B, and C.
See The LINPUT Statement for additional examples.
The LINPUT Statement
LINPUT accepts as a single string variable any data received
during an input operation. The format for the LINPUT
statement used with peripherals is as follows.
LINPUT #file-number, string-variable
In contrast to the INPUT statement, LINPUT is unaffected by
punctuation or spaces in the data being accepted-
information is stored exactly as received. The following table
gives examples of the difference between the two
statements.
PROGRAM
DATA RECEIVED SEGMENT DATA DISPLAYED
"BROWN, CHARLES" 10 INPUT #1,A$ BROWN, CHARLES
20 DISPLAY A$
"BROWN, CHARLES" 10 LINPUT #1,A$ "BROWN, CHARLES"
20 DISPLAY A$
BROWN, CHARLES 10 INPUT #1,A$ BROWN
20 DISPLAY A$
BROWN, CHARLES 10 LINPUT #1,A$ BROWN, CHARLES
20 DISPLAY A$
CHARLES 10 INPUT #1,A$ CHARLES
20 DISPLAY A$
CHARLES 10 LINPUT #1,A$ CHARLES
20 DISPLAY A$
OPERATING THE SYSTEM
The data string "BROWN, CHARLES", put into memory by
INPUT, is displayed as BROWN, CHARLES without quotation
marks. When LINPUT is used, the display matches the
original data. BROWN, CHARLES without quotation marks is
taken by LINPUT as a single string variable. INPUT treats the
comma as a separator and takes this data as two distinct
variables.
When CHARLES, preceded by blank spaces, is entered
INPUT takes the blanks as zero input and disregards them.
LINPUT takes them as actual input and reproduces the entire
string, including the blanks.
As the examples show, LINPUT has great utility in situations
involving transfers of data with punctuation, such as
passages of text. In such applications you may often find it
more useful than INPUT.
Example:
300 LINPUT #4,L$
Puts a record's length of data from the device opened
as #4 into the string variable L$ (assuming a transfer
type of T = R for "record"). Transfer type is discussed in
the Software Options section of the manual.
Both INPUT and LINPUT take data from the RS232 port.
When used without a file number, both statements also
accept data from the computer console. Neither INPUT nor
LINPUT, however, can be used with the parallel port.
The PRINT Statement
To send data from the computer through this peripheral to
another device such as a printer or a display terminal, use
the PRINT statement in either of the formats shown below. A
parallel port device must first be opened in OUTPUT mode,
and an RS232 device must be opened in OUTPUT or UPDATE
mode.
PRINT #file-number, print-list
PRINT #file-number, USING {string expression},print-list
{line number }
The optional USING clause specifies the printing or display
format to be used. String-expression defines the format in
the same way as the IMAGE statement (described in the
BASIC reference manual). Line-number refers to the line
number of an IMAGE statement. When used without a file
number, both forms of the PRINT statement place data in
computer display.
OPERATING THE SYSTEM
Examples:
400 PRINT #9,A$
Sends the value of the variable A$ to the device opened
as #9.
410 PRINT #9,"HELLO"
Sends the string HELLO to the device opened as #9.
420 PRINT #9, USING "###.#",357.97
Outputs the value 358.0 to the device opened as #9.
When data is transmitted through the RS232 peripheral to
another device, a carriage return followed by a linefeed
character is sent after each record unless carriage return
software options N or C are set. For a description of the
carriage return and linefeed functions, refer to the section on
the carriage return software option.
The LIST Command
The lines of a program in the computer can be sent through
this peripheral for display or printing on another device by
use of the LIST command in the following format.
LIST "device-number [.software-options] " [,line-list]
No file number is needed; the LIST command opens and
closes the device automatically. Using LIST without
specifying a device number causes the program lines to be
listed in the computer display.
Examples:
LIST " 20.B=4800,N=10",10-100
Causes device 20 (attached to the RS232 port) to list
lines 10 through 100 of a program stored in the
computer. Software options needed for a match in
device characteristics are specified. Those not specified
remain at their default values.
LIST "50"
Causes an entire program to be printed through the
parallel port. The software options are left at their
default values.
OPERATING THE SYSTEM
The EOF Function
BASIC functions are program elements that return a value
after manipulating data, based on parameters given in the
function statements. You can use EOF (end-of-file) when
accepting input from mass storage devices to test whether
the end of a data file has been reached. With devices such
as the Wafertape(tm) peripheral, the value returned by the EOF
function (O or -1) depends on where you are in the file being
read A -1 denotes the end of a file. A 0 means no end-of-
file.
Since the purpose of the RS232 peripheral is not mass
storage, EOF has little application with this device. The value
returned is always 0, indicating that no end-of-file has been
reached.
The CALL IO Statement
CALL IO is a BASIC statement used with the CC-40 computer
to access special features and capabilities unique to many
HEX-BUS(Tm) peripherals.
The RS232 peripheral supports service requests. With this
peripheral, the most frequent use of CALL lO-other than in
the power-up check-is to enable attached devices to issue
service requests or to disable them from doing so. An
example of this CALL IO application can be found in
appendix B.
For further information about the CALL IO statement, consult
the manual for the Editor/Assembler software package.
Software Options
Devices that can be attached to this peripheral differ in how
quickly they operate, how much data they can handle in a
given time, and so on. You can compensate for such
differences by selecting options which are available as part
of the OPEN statement and the LIST commands in BASIC.
Because these options are set within programs, or software,
they are known as software options.
The RS232 peripheral has 12 software options. Ten of these
options affect the RS232 port, which is available for both
input and output. The remaining two control the parallel port,
which can be used only for output.
You can match the operating characteristics of this
peripheral to those of other devices by indicating desired
software options in the OPEN statement and in the LIST
OPERATING THE SYSTEM
command. Since the rest of the BASIC statements and
commands that control this peripheral operate on previous
opened files, you do not need to list options with any of
them-only with OPEN and LIST.
The RS232 peripheral automatically assumes certain preset
software options, called default values. You only have to
specify those settings that you wish to change from their
default values. The tables on the next two pages summarize
the options, their formats, and their default values.
The software options are described in detail on the pages
following the tables. Examples of their application occur in
this section as well as in the COMMON APPLICATIONS
section and in appendix B. In all examples the formats for
specifying software options are those used with the CC-40
SOFTWARE OPTIONS (RS232 PORT>
OPTION DEFAULT FORMAT SETTINGS
Baud rate 300 B= 50,75,110,135,150,300,
600,12OO,1800,2400,
3600,4800,7200,9600,
19200
Data bits 7 D = *5,6,7,8
Parity O P = O,E,N,S,M
Parity check N C = N,Y
Nulls 0 N = 0-99
Stop bits 1 S = *1,2
Echo Y E = N,Y
Transfer type R T = R,C,W
Data overrun Y O = N,Y
Carriage return L R = N,C,L
*lf settings D=5 and S=2 are used, the actual number of stop
bits is 1 1/2.
Note: Several of the above options have equivalent options in
the RS232 interface designed for the T1-99/4A Home
Computer. Where such a correspondence exists, the RS232
software options listed above may be specified either in the
CC-40 format shown or in the alternate 99/4A format. The
RS232 options that have this dual-format feature are
tabulated on the following page.
OPERATING THE SYSTEM
SOFTWARE OPTIONS (PARALLEL PORT>
OPTION DEFAULT FORMAT SETTINGS
Carriage return L R = N, C, L
Strobe level N S = P, N
RS232 SOFTWARE OPTIONS WITH
ALTERNATE FORMATS
STANDARD ALTERNATE
OPTION FORMAT FORMAT REMARKS
Baud rate B = .BA =
Data bits D = .DA =
Parity P = .PA =
Parity check C = .CH .CH is equivalent
to C = Y. Tells the
peripheral to
check parity.
Nulls N = .NU .NU is equivalent
to N = 6. Specifies
six null
characters.
Stop bits S = .TW .TW is equivalent
to S = 2. Specifies
two stop bits.
Echo E = .EC .EC is equivalent
to E = N. Turns the
echo feature off.
Carriage return R = .CR .CR is equivalent
to R = N. No
carriage return or
linefeed is sent.
.LF .LF is equivalent
to R = C. Specifies
carriage return
only - no line feed
is sent.
OPERATING THE SYSTEM
Baud Rate
The baud rate is a measure of the speed of data transmission
After it has been set (in an OPEN statement) it remains that
way unless reset in another OPEN statement, or until the
peripheral is turned off. You can choose baud rates of 50, 75
110, 135, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200,
9600, and 19200. The rate you choose should match the rate
of the device being used. If you specify the baud rate as
B = 1800, for example, the RS232 port is set up to transfer
data at a rate of 1800 baud. The power-up default is 300. If
you specify a different baud rate, it becomes the new default
until the peripheral is turned off or a new baud rate is
specified.
Data bits
The data bits option lets you set the number of bits
contained in each character transmitted. You have a choice
of five, six, seven, or eight bits. If you specify D = 7, then
seven-bit characters are sent. This is the ASCII standard and
the power-up default value. If you set the number of data bits
to 5, 6, or 8, this setting becomes the new default value until
the peripheral is turned off or a different number is specified.
Parity
Checking parity is a way of detecting errors in data
transmission. A parity bit can be inserted into each byte of
data sent. It may be either 1 or 0, depending on the type of
parity chosen. This peripheral can check certain types of
parity at the RS232 port. If the type you specify in the OPEN
statement is one of those that can be checked, any loss or
distortion of data during transmission produces an error
indication. The parity options are as follows.
< E for even parity.
< 0 for odd parity.
< S for space parity.
< M for mark parity.
< N for no parity.
As an example, specifying P = E for even parity sets the
parity bit in a data byte to 0 if the byte has an even number
of Is and to 1 if the byte has an odd number of Is. Odd
parity is the power-up default. Once the parity is set, it
remains as specified until changed by a new OPEN
statement. The parity types are described in appendix C.
OPERATING THE SYSTEM
Parity Check
The peripheral can check for odd or even parity at the RS232
port. The parity check option allows you to control the use of
this capability. C = N is the default value. When this setting
is chosen or when no setting is specified, parity is not
checked. Specifying C=Y in an OPEN statement enables the
peripheral to monitor odd or even parity.
NULLS
The nulls option determines how many null characters follow
a carriage return character. Nulls are included to give a
printer time to complete its return before it begins printing
characters. You may specify any number from 0 to 99. With
the option N = 7, for instance, seven null characters are sent
after a carriage return. The default value is N =0.
Stop bits
Stop bits are sent after transmission of each character to
indicate the end of that character. With the stop bits
software option, you can set the number of stop bits to
either 1 or 2. The setting S=2, for example, causes this
peripheral to end each transmission with two stop bits. The
default value is S = 1. Note that if the settings D = 5 and S = 2
are used, the actual number of stop bits is 1 1/2.
Echo
The echo software option provides an additional method of
detecting errors in transmission of data from a Peripheral
device through the RS232 port to the computer. The RS232
peripheral can be instructed to retransmit characters, as it
receives them, back to the sending device. You can select
E=Y to have characters echoed back to the sending device
or E = N to prevent them from being echoed back. The default
is E = Y.
Transfer Type
Incoming data is temporarily stored at the RS232 port. The
transfer type software option determines the form in which
data is moved from the port to the computer.
Option T = R, the default setting, sends input to the computer
in records of the length established in the associated OPEN
statement. If VARIABLE 15 is specified, for example, data is
transferred in records 15 characters long. This feature is
useful in applications that involve data received in records of
some consistent length.
OPERATING THE SYSTEM
Should a carriage return end the data stream before a record
is complete, the record goes to the computer with the
remainder of its length padded by blank spaces. An entire
record's length of blanks is sent to the computer if a carriage
return is the first character input with option T = R.
If the data transmission itself has a series of trailing blanks
between the carriage return and the end of the actual data,
the user's choice of input statement determines how the
blanks are handled. INPUT removes trailing blanks. LINPUT
preserves them as part of the data.
Option T = C transfers data character by character. Within
limits, any characters stored in the peripheral at the time of
an input operation (including carriage returns and linefeeds)
are sent to the computer. The limits are set by the record
length specified in the OPEN statement and by the number
of characters in the peripheral: the lower of these two figures
is the number of characters transferred. If no data is
available, a null data string is set to the computer and the
program continues.
Option T=W also transfers data character by character. As
long as data is in the peripheral there is no difference
between this option and option T = C, but when no data is
available the RS232 port causes the computer to wait until a
character is ready.
Setting the transfer type to T = C, for example, allows
sending as many characters as are stored at the port, up to
the specified record length, to the computer.
Data Overrun
A data overrun occurs when the RS232 port receives more
data than it can send on to the computer. Any additional
data that arrives during an overrun is lost. Use the data
overrun option to specify whether you wish the peripheral to
report data overrun as an error.
Choosing the option 0 = N causes the peripheral to disregard
data overruns When you are receiving data through the
RS232 port from a device such as a video terminal, this
setting allows the incoming data stream to overflow the port
without producing an error indication and stopping the
program. Characters lost during an overrun are not echoed
back to the sending device, regardless of the echo option
setting.
OPERATING THE SYSTEM
Selecting the option O=Y (which is the default value) allow
a data overrun error to stop a program. This feature is helpful
when the loss of even a small amount of data would make
the rest of a transmission useless.
Carriage Return
The carriage return option allows the peripheral to regulate
the carriage operation of a printing or display device
connected to the RS232 port. The peripheral can be directed
either to send an automatic linefeed and carriage return (or
just a carriage return) at the end of each record, or to
suppress those characters.
The carriage return sends the print head or cursor of the
attached device back to the starting point. The linefeed
character causes the paper or display to advance by one
The options are as follows.
* R = L for carriage return and linefeed.
* R = C for carriage return only.
* R = N for no carriage return or linefeed.
Selecting the option R = C, for example, means that each
record sent from the peripheral is followed by a carriage
return but not by a linefeed. The default value is L. These
details apply equally to the parallel port carriage return
option, which has the same selections and default.
Carriage Return (Parallel Port)
The carriage return option for the parallel port works in the
same way as the carriage return option for the RS232 port.
determines whether the peripheral sends or suppresses an
automatic linefeed and carriage return (or carriage return
only) at the end of each record. The options and default are
identical to those of the RS232 port.
Strobe Level (Parallel Port)
A strobe is a control signal used in data transfers. Some
printers which can be connected to the parallel port require
positive strobes, while others use negative strobes (both
described in appendix E). The strobe level software option
lets you select which level to use with a given printer. The
setting S = P in an OPEN statement produces a positive
strobe. S = N (which is the default value) produces a negative
strobe. Consult the user's manual of the printer you intend
connect for the proper strobe level.
RECOVERY FROM ERRORS
RECOVERY FROM ERRORS
Most errors that involve the RS232 peripheral occur during
input or output with this device as a result of some
discrepancy in program statements. These errors are seldom
serious, and they are easily remedied. Errors are normally
indicated to the operator in the form of a displayed message
beginning I/O error... which includes a one- to three-digit
error code and the device or file number of the port
concerned. If the error occurs during execution of a program
any open files are automatically closed. The error codes that
you may encounter with this peripheral are listed in append
A with their meanings and recommended corrective steps.
In the event of such an error, first note the code number and
look it up in appendix A. Next clear the fault indication and
restore the cursor by pressing [CLR]. Then try the operation
again, following the suggestions given in the appendix for
that error.
If the above measures do not solve the problem, turn the
peripheral off briefly and try once more. If the malfunction
persists, turn the computer off momentarily and try again.
Successive attempts that produce the same error may
indicate a hardware fault. Consult the in Case of Difficulty
section of this manual for service information and additional
troubleshooting suggestions.
COMMON APPLICATIONS
COMMON APPLICATIONS
The RS232 peripheral lets you operate your computer with
wide range of devices beyond those in the standard group
HEX-BUS(tm) peripherals. Two examples are given here. The
first shows how data can be sent from the computer to a
printer on the parallel port, and the second illustrates how
you can use the computer to communicate with a video
display terminal on the RS232 port.
Output to a Printer on the Parallel Port
In this example, seven character strings are read from data
statements at the end of the program and printed.
100 DIM A$(7)
200 FOR P=1 TO 7:READ A$(P)
300 NEXT P
400 OPEN #23,"50", OUTPUT
500 FOR S=1 TO 7:PRINT #23,A$(S)
600 NEXT S
700 CLOSE #23
800 DATA "MONDAY","TUESDAY","WEDNESDAY", "THURSDAY"
900 DATA "FRIDAY", "SATURDAY", "SUNDAY"
Lines 100-300 set up an array and read in the data. Line 400
assigns file number 23 to device number 50, a printer on the
parallel port. The port is opened for OUTPUT. Because no file
type is specified, DISPLAY is assigned by default and the
attached printing device receives data in ASCII format.
Carriage return setting L, also selected automatically, sends
both a carriage return and a linefeed character to the printer
at the end of each record. In lines 500 and 600 a PRINT loop
is executed seven times. Each character string is printed on
a separate line.
If the printer is off-line when the PRINT loop is executed, the
RS232 peripheral holds the data ready and waits. After all the
lines are printed, the device is closed.
Exchanging Messages Between a
Computer and a Video Terminal
The following program can be used in a HEX-BUS(tm) system
with a video display terminal connected to the RS232 port.
The program first accepts a message from the computer and
COMMON APPLICATIONS
transmits it to the terminal. The terminal user is then
prompted to enter a message which is sent to the computer
display. The exchange of messages can continue for as long
as the program is run.
100 OPEN #1,"20.B=4800,0=N,R=N,C=Y,P=O,D=7",
DISPLAY, UPDATE
200 INPUT "TYPE MESSAGE: ";X$
300 PRINT #1,"MESSAGE FROM COMPUTER:
";X$;CHR$(10);CHR$(13)
400 PRINT #1,"TYPE MESSAGE: "
500 INPUT #1,X$
600 PRINT #1,CHR$(10)
700 PRINT "MESSAGE FROM TERMINAL: ";X$
800 PAUSE
900 GOTO 200
Line 100 opens file number 1 for the RS232 port and defines
a number of parameters for operation-baud rate,
management of data overruns, carriage return and linefeed
setting, parity check, parity type, number of data bits, file
type, and open mode. More details on these parameters can
be found in the USING BASIC section. They are set up to
match the operating characteristics of the RS232 peripheral
to those of the terminal.
Line 200 prompts the computer user to type a message and
puts it into the string variable X$. Line 300 sends the
message to the terminal, where it is displayed with the
introductory words MESSAGE FROM COMPUTER:. Both of these
items are displayed on the same line.
In lines 400 and 500, the terminal user is prompted to type
message which is sent back to the computer. So that the
terminal user's prompt and message do not appear on the
same line as the computer user's, carriage return and
linefeed characters-CHR$(13) and CHR$(10)-are inserted
after the message from the computer in line 300.
In line 600, a linefeed character is sent to the terminal so
that the next message from the computer does not erase the
terminal user's current message from his display. Lines 700
and 800 place the terminal user's message in the computer
display. The PAUSE instruction holds the message in the
computer display until the computer user presses the [ENTER]
key to resume the exchange.
APPENDICES
APPENDIX A: ERROR CODES
Listed below are the error codes related to the operation o
the RS232 peripheral in BASIC programs.
The error codes marked with an asterisk (*) are those that
apply only if you use the CALL IO instruction. They do not
occur with any other BASIC statements or commands.
CODE MEANING
0* NO ERRORS.
1 DEVICE/FILE OPTIONS ERROR. Check the software
options in the OPEN statement or IO call. Make sure
that commas, periods and equal signs are used
correctly.
2 ERROR IN ATTRIBUTES. Check the file attributes
given in the OPEN statement or IO call.
4 DEVICE/FILE NOT OPEN. Open the device before
using it.
5 DEVICE/FILE ALREADY OPEN. Close the device an
try again. If the CLOSE statement in BASIC does n
work, use CALL IO(20,1) to close the RS232 port or
CALL IO(50,1) to close the parallel port. If the above
steps are not successful, you can close all
peripherals by turning the computer off momentarily
8* DATA/FILE TOO LONG. Modify the Peripheral Access
Block.
10* NOT REQUESTING SERVICE. This message may be
sent by a peripheral in response to a poll by the
computer to determine which device issued a service
request.
12* BUFFER SIZE ERROR. The data buffer size specified
in the Input/Output subsystem instructions is not
large enough for the data returned by a peripheral.
Make the buffer larger.
13 UNSUPPORTED COMMAND. The peripheral
generates this message in response to commands
that it can not accept.
14 DEVICE/FILE NOT OPEN FOR OUTPUT. The
peripheral's current open mode does not allow you
send data. Reopen the device in OUTPUT (either port)
or UPDATE (RS232 port) mode.
APPENDICES
15 DEVICE/FILE NOT OPEN FOR INPUT. The
peripheral's current open mode does not allow you
receive data. Reopen the RS232 port in INPUT or
UPDATE mode.
17 RELATIVE FILES NOT SUPPORTED. The RS232
peripheral can only process SEQUENTIAL files.
19 APPEND MODE NOT SUPPORTED. This peripheral
cannot operate in the APPEND mode. It must be
opened in INPUT, OUTPUT, or UPDATE mode,
depending on its application in a given program.
21 INPUT MODE NOT SUPPORTED. The peripheral
returns this message if you try to open the parallel
port in the INPUT mode. The port is provided
specifically for output to printers. It must be opened
in the OUTPUT mode.
22 UPDATE MODE NOT SUPPORTED. The peripheral
returns this message if you try to open the parallel
port in the UPDATE mode. Use the OUTPUT mode.
80 DATA OVERRUN. Data is arriving at the RS232 port
faster than it can be sent on to the computer. Input
more frequently to save data, or set the overrun
software option to 0 = N to ignore the loss of data.
81 PARITY ERROR. Indicates either that a data
transmission error has occurred or that the parity
settings of the RS232 port and the attached device
do not match. Check that the parity settings are the
same.
82 FRAMING ERROR. A disparity exists between the
data bits, stop bits, baud rate, or parity software
option settings of the RS232 port and the
characteristics of the attached device. Be sure that
these settings match the device characteristics.
83 FRAMING AND PARITY ERRORS. A combination of
errors 81 and 82 is occurring. Correct the problem as
described above.
255 TIME-OUT ERROR. The computer generates this error
code if it cannot communicate with a peripheral.
Check the HEX-BUS cable connections and make
sure that you are using the correct device-number.
APPENDICES
APPENDIX B: USING ASSEMBLY LANGUAGE
This appendix is primarily for use in conjunction with the
Editor/Assembler manual and software package created for
the CC-40 computer and its peripherals. The descriptions and
sample application given here supplement the explanations
and examples found in the Editor/Assembler manual.
The CC-40 has an Input/Output subsystem which you can
access to communicate with HEX-BUS(tm) peripherals on an
assembly-language level. This communication can take place
either entirely in assembly language if you have the
Editor/Assembler cartridge, or from BASIC if you use the
CALL IO instruction with appropriate command codes.
Command Codes
The devices that you can attach to the RS232 peripheral are
essentially display-type devices, not oriented toward use with
files. The commands affecting this peripheral involve the
basic functions of opening or closing devices and reading or
writing data. (The RS232 port also supports service requests.)
The assembly-language command codes with which you can
direct the RS232 peripheral to carry out these tasks are Iisted
below together with any applicable restrictions.
0 Open. Prepares a device for use. The APPEND mode
and RELATIVE file type cannot be used with either port
of the peripheral. The UPDATE and INPUT modes can
be used only with the RS232 port.
1 Close. Completes any pending operations by a device
and ends the use of the device until the next open
instruction.
3 Read. Inputs data from a peripheral device. The read
command can be used with the RS232 port, but not
with the parallel port. The attached device must first be
opened in INPUT or UPDATE mode.
4 Write. Sends data to a peripheral device. The write
command can be used with both ports of this
peripheral. The parallel port must first be opened in
OUTPUT mode and the RS232 port in OUTPUT or
UPDATE mode.
7 Return Status. Used in requesting device and file status
information from peripherals. When this message is
used with the RS232 peripheral, the end-of-file flag is
always returned set to zero.
APPENDICES
8 Enable Service Requests. Signals a peripheral device
that it may issue service requests to the computer. This
command is used only with the RS232 port since the
parallel port cannot send messages to the computer.
The next section of this appendix contains further
details.
9 Disable Service Requests. Signals a peripheral device
that it may no longer request service. This instruction
can be used only with the RS232 port.
Service Request Poll. Not used in programming, but
automatically sent to peripherals by the computer upon
reception of a service request. Determines which device
is requesting service.
15 Set Options. Modifies the peripheral options previously
specified in an open instruction without first closing
and reopening the device.
16 Transmit Break. Causes the RS232 peripheral to send a
continuous break signal for approximately .25 seconds.
Used in data communications to shift between
operating modes.
254 Null Operation. Not used in programming, but
automatically sent by the computer in response to any
service requests received while a previous request is
being processed. Though the computer may enable a
number of peripherals for service requests, it can
process only one request at a time.
255 Reset Bus. Not normally included in programs, but
allows the user to close all open device files and reset
all peripherals attached to the computer.
For a detailed treatment of the Input/Output subsystem and
command codes, refer to the manual for the Editor/Assembler
cartridge.
Service Requests
Many HEX BUS(tm) peripherals have unique capabilities which
are accessible on an assembly-language level. The RS232
peripheral can be enabled for service requests. It then has
the ability to interrupt regular program execution and have
data processed by the computer.
APPENDICES
This peripheral, when enabled, issues a service request to
the computer whenever data from the attached device
appears at the RS232 port. The peripheral is enabled for
service requests as follows.
1. Set up a Service Request Peripheral Access Block
(SRPAB).
2. Enable interrupts.
3. Open the device.
4. Send the enable service requests instruction.
The above steps are executed most efficiently in assembly
language, as described in the Editor/Assembler manual. With
somewhat reduced efficiency, they can also be performed in
BASIC. Since assembly-language programming is not within
the scope of this manual, a BASIC example is given ere.
The SRPAB, set up in computer memory by the user, supplies
the parameters necessary for communication with the RS232
peripheral through the Input/Output subsystem. It contains
the one- or two-byte fields diagrammed below, which are
filled as needed for each particular application. The diagram
shows an SRPAB that allows service requests from a device
on the RS232 port.
SRPAB$
Device number 20 RS232 port
Command code 0 Don't care
Logical unit number (LUNO) 0 Don't care
Record number 0 Don't care
0
Buffer length 10 Size of allocated buffer
0
Data length 0 Not sending any data
0
Returned status 0 Zeroed initially
Buffer pointer LSB Points to highest address
MSB in buffer
Link to next SRPAB LSB2 Points to start of this SRPAB
MSB2 (No other device enabled)
Service flag 0 Zeroed initially
Pointer to device service 0 Left zeroed
routine (DSR) 0
APPENDICES
As the diagram indicates, the elements that must be
specified in building a Service Request PAB for the RS232
peripheral are the device number, buffer length, data length,
return status, buffer address, SRPAB pointer, service flag,
and device service routine (DSR) pointer. The field for the
DSR pointer is provided for future applications. It is not used
in the CC-40 and should be left zeroed as shown.
Data is entered in the fields of an SRPAB with the POKE
subprogram. The necessary values are placed in memory
starting at the lowest address allocated. The following
program segment illustrates the four-stage process of
enabling the RS232 peripheral for service requests, beginning
with the construction of an SRPAB.
100 CALL GETMEM (17,SRPABADDR) ! Gets SRPAB
110 CALL GETMEM (10,BUFFADDR) ! Gets buffer
120 CALL SPLIT (BUFFADDR+9,MSB,LSB)! Builds SRPAB
130 CALL SPLIT (SRPABADDR+16,MSB2,LSB2)
140 CALL POKE (SRPABADDR,0,0,0,MSB2,LSB2,MSB,LSB,0,
0,0,0,10,0,0,0,0,20)
150 CALL POKE (2056,MSB2,LSB2) !Sets up pointer to
SRPAB
160 CALL POKE (BUFFADDR,5,10) ! Enables interrupts
170 CALL EXEC (BUFFADDR)
180 CALL PEEK (256,IOCNTRL)
190 IOCNTRL=IOCNTRL OR 1
200 CALL POKE (256,IOCNTRL)
210 OPEN #1,"20.B=9600,C=Y,P=E,D=7,E=Y,T=C",
VARIABLE 10
220 CALL IO(20,8) !Sends enable service requests
command
lines 100-140 above prepare memory space for the SRPAB
and the data buffer. line 150 sets up a pointer to the SRPAB
for the I/O subsystem. In lines 160-200, interrupts are enabled
so that the computer can recognize service requests. In line
210 the peripheral is opened, as required before enabling
service requests. The enable service requests command is
sent in Line 220.
The SPLIT subprogram which is called in lines 120 and 130
splits a 16-bit unsigned data value into a Most Significant
Byte (MSB) and a least Significant Byte (LSB), as shown
below.
1000 SUB SPLIT (DATAVAL,MSB,LSB)
1010 MSB=INT(DATAVAL/256)
1020 LSB=DATAVAL-MSB*256
1030 SUBEND
APPENDICES
After a device is enabled for service requests, a program can
check for received data by testing the service flag in the
SRPAB as shown below. The 110 subsystem sets the service
flag upon completion of a successful poll.
230 CALL PEEK (SRPABADDR+2,SERVICE_FLAG)
240 IF SERVICE_FLAG<>0 THEN 700
250 GOTO 230
If the service flag check indicates no reception of data, the
main program continues immediately after line 240. If the
service flag is set, however, execution of the main program
halts and the program branches to line 700. At line 700 the
operation status is checked. Data is then removed and
processed.
700 CALL PEEK (SRPABADDR+7,STATUS)
710 IF STATUS THEN PRINT
" Error-- "; STATUS: PAUSE: STOP
720 CALL PEEK (SRPABADDR+8,MSB,LSB)!Gets data length
730 DATLEN=MSB*256+LSB !MSB should always be zero
740 DATA$= "" !Initializes data string
750 FOR I=1 TO DATLEN
760 CALL PEEK (BUFFADDR+10-I,A)! Gets next character
770 DATA$=DATA$&CHR$ (A)!Appends it to the string
780 NEXT I
790 PRINT DATA$
800 PAUSE
The number of characters transferred during each service
request depends on the buffer length and transfer mode
established in the OPEN command. If the option T = R is
specified, then a full record of data (or data padded with
blanks) having the length of the buffer is sent. If the record
is not complete when the computer polls the RS232 port, the
peripheral causes the computer to wait until it is complete.
the options T = C or T = W are chosen, any number of
characters up to the buffer length may be transferred.
Until the SRPAB service flag is reset to zero by the program,
any additional service requests are disregarded. The
peripheral requesting service continues doing so until its
request is acknowledged.
If the computer transmits an input instruction to a peripheral
issuing a service request, the service request is terminated
and the peripheral sends the required data instead. Data can
also be output to devices enabled for service requests. These
operations are executed as usual.
APPENDICES
APPENDIX C: PARITY OPTIONS
Listed and defined below are the parity options available to
you in data transmissions with the RS232 peripheral. This
peripheral checks for even and odd parity.
E Even parity. If a data byte in the transmission
contains an odd number of 1s, its parity bit
becomes 1. If the data byte has an even number of
1s, its parity bit becomes 0.
O Odd parity. If a data byte in the transmission has
an even number of 1s, its parity bit is set to 1.
Otherwise, its parity bit is set to 0.
S Space parity. If you specify space parity, the parity
bit is always 0 regardless of whether the data byte
contains an even or odd number of 1s.
M Mark parity. The parity bit is always 1.
N No parity. The data transmission does not contain
a parity bit.
APPENDICES
APPENDIX D: RS232 CABLING
Cables used to connect other computers, calculators,
modems, or terminals to the RS232 port must have EIA
RS232C 25-pin male connectors. Some electronic devices
built according to the RS232C standard use nearly all the
available lines, while other devices require fewer
connections. This peripheral utilizes the nine pins listed
below.
PIN SIGNAL DIRECTION
1 Frame ground -----
2 Serial data in To HX-3000 RS232 port
3 Serial data out From HX-3000 RS232 port
4 Request to send To HX-3000 RS232 port
5 Clear to send From HX-3000 RS232 port
6 Data set ready From HX-3000 RS232 port
7 Signal ground From HX-3000 RS232 port
8 Data carrier detect From HX-3000 RS232 port
20 Data terminal ready To HX-3000 RS232 port
The RS232C peripheral connects directly to most video
display terminals and serial printers such as the Texas
Instruments 99/4 Impact Printer without modification. In
these applications the following lines are used.
HX-3000 DATA
RS232 TERMINAL
PORT EQUIPMENT
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
20 20
APPENDICES
The Texas Instruments Telephone Coupler (modem) is
compatible with this peripheral in all respects. Other modems
may require cabling that differs slightly from the
configuration shown. If you use a modem other than Tl's,
check its manual to determine whether any wiring changes
are necessary for compatibility. In general, other devices
such as modems require the pin connections listed below.
Pin 4 is jumpered to pin 20 inside the RS232 peripheral.
HX-3000 DATA
RS232 COMMUNICATIONS
PORT EQUIPMENT
1 1
2 3
3 2
6 20
7 7
8 8
20 6
APPENDICES
APPENDIX E: PARALLEL PORT CABLING
Peripherals equipped with the parallel port option have a
permanently-attached flat cable which is fitted with the
Amphenol 36-pin male type of connector or its equivalent.
These are standard parallel connectors. Twenty of the
available pins are used. Eight lines transfer data, while two
others carry control signals. The remaining 10 lines serve as
signal grounds. The pins are connected as listed below.
PIN FUNCTION
1 Strobe
2 DO (least significant data bit)
3 DI
4 D2
5 D3
6 D4
7 D5
8 D6
9 D7 (most significant data bit)
10 Acknowledge
19-28 Ground
The signals on pins 1 through 9 are outputs from the parallel
port to the printer. Acknowledge is an input to the parallel
port from the printer.
The following diagram illustrates the sequence of events that:
occur during transmission of data from the parallel port.
When a data byte appears at the port, the strobe (either
positive or negative, as selected by the user) signals the
attached printer that data is available. If the printer is ready
to receive it the data is transferred and processed. When the
printer is ready to accept another byte, the acknowledge
signal is sent back to the parallel port.
SERVICE INFORMATION
SERVICE INFORMATION
In Case of Difficulty
If this peripheral or attached devices do not appear to be
working properly, check the following.
1. Power-Be sure that the power source is in order, the
peripheral is plugged in, and the power switch is on. All
peripherals must be turned on for proper operation.
2. When connecting devices to the HX-3000 RS232 port, be
sure the correct cable is being used. Check for loose or
broken leads and connectors. Be sure that cables are
plugged in securely. Some devices may require special
cable connections (see appendix D).
3. Software Options-Even when all devices are operating
correctly, this peripheral can appear to malfunction if
software options are improperly set. Check the user's
manual of the device attached to the peripheral and verify
that the device characteristics correspond to the options
selected in the OPEN statement or LIST command. A
printer built to operate at 300 baud, for instance, will not
function if a baud rate of 1200 is chosen. In
communications with other computers or with terminals,
unsuitable baud rate, data bits, parity, echo, or carriage
return settings may produce undesirable results.
4. Attached Devices-If a device has a test or local mode,
use it to be sure that the device is working properly when
disconnected from the HX-3000 RS232 peripheral.
If the RS232 peripheral or attached devices still do not
appear to be working properly, first turn all power off. Next,
disconnect this peripheral from the HEX-BUS(tm) interface and
attached devices. Then follow the steps below.
1. See if the computer itself is working properly. Turn on the
computer. Enter the statement OPEN #1, "20" (or OPEN #1,
"50" if the malfunction is associated with the parallel port
The error message I/O error 255 #1 should appear in the
computer display, indicating that the port named cannot be
opened. This result is expected when the RS232 peripheral
is not connected to the HEX-BUS interface.
SERVICE INFORMATION
SERVICE INFORMATION
In Case of Difficulty
If this peripheral or attached devices do not appear to be
working properly, check the following.
1. Power-Be sure that the power source is in order, the
peripheral is plugged in, and the power switch is on. All
peripherals must be turned on for proper operation.
2. When connecting devices to the HX-3000 RS232 port, be
sure the correct cable is being used. Check for loose or
broken leads and connectors. Be sure that cables are
plugged in securely. Some devices may require special
cable connections (see appendix D).
3. Software Options-Even when all devices are operating
correctly, this peripheral can appear to malfunction if
software options are improperly set. Check the user's
manual of the device attached to the peripheral and verify
that the device characteristics correspond to the options
selected in the OPEN statement or LIST command. A
printer built to operate at 300 baud, for instance, will not
function if a baud rate of 1200 is chosen. In
communications with other computers or with terminals,
unsuitable baud rate, data bits, parity, echo, or carriage
return settings may produce undesirable results.
4. Attached Devices-If a device has a test or local mode,
use it to be sure that the device is working properly when
disconnected from the HX-3000 RS232 peripheral.
If the RS232 peripheral or attached devices still do not
appear to be working properly, first turn all power off. Next,
disconnect this peripheral from the HEX-BUS(tm) interface and
attached devices. Then follow the steps below.
1. See if the computer itself is working properly. Turn on the
computer. Enter the statement OPEN #1, "20" (or OPEN #1,
"50" if the malfunction is associated with the parallel port
The error message I/O error 255 #1 should appear in the
computer display, indicating that the port named cannot be
opened. This result is expected when the RS232 peripheral
is not connected to the HEX-BUS interface.
SERVICE INFORMATION
2. Check that the RS232 peripheral is working properly. Refer
to the set-up instructions and reconnect only the HX-3000
RS232 peripheral to the HEX-BUS interface. Type the
statement OPEN #1,"20" or OPEN #1, "50" and press [ENTER].
The OPEN statement should disappear from the computer
display and be replaced by a flashing cursor on the left
side, indicating that the port named has been opened.
3. If a device still does not work when reattached to this
peripheral, then that unit or its cable may be faulty. Check
the user's manual of the device for additional
troubleshooting suggestions.
4. If none of the above procedures correct the difficulty,
consult the section entitled If You Have Questions or Need
Assistance or refer to the Service Information portion of
the User's Reference Guide.
Exchange Centers
If your HX-3000 RS232 peripheral requires service and you do
not wish to return the unit to a service facility for repair or
replacement, you may elect to exchange the unit for a
factory-reconditioned HX-3000 RS232 peripheral of the same
model (or equivalent model specified by TI) by going in
person to one of the exchange centers which have been
established across the United States. A handling fee will be
charged by the exchange center for in-warranty exchanges of
the HX-3000 RS232 peripheral. Out-of-warranty exchanges will
be charged at the rates in effect at the time of the exchange.
Please refer to the enclosed Exchange Service listing or call
the Consumer Relations Department for exchange fee
information and the location of the nearest exchange center.
If You Have Questions or Need
Assistance
If you have questions concerning HX-3000 RS232 peripheral
repair or peripheral, accessory, or software purchase, please
call our Customer Relations Department at (800) 858-4565 (toll
free within the contiguous United States). The operators at
these numbers cannot provide technical assistance.
For technical questions such as programming, specific
applications etc., you can call (806) 741-2663. Please note
that this is not a toll-free number and collect calls cannot be
accepted.
SERVICE INFORMATION
As an alternative you can write to
Consumer Relations Department
Texas Instruments Incorporated
P.O. Box 53
Lubbock, Texas 79408
Because of the number of suggestions which come to Texas
Instruments from many sources containing both new and old
ideas, Texas Instruments will consider such suggestions only
if they are freely given to Texas Instruments. It is the policy
of Texas Instruments to refuse to receive any suggestions in
confidence. Therefore, if you wish to share your suggestions
with Texas Instruments or if you wish us to review any
BASIC language program which you have developed, please
include the following statement in your letter.
"All of the information forwarded herewith is presented
to Texas Instruments on a nonconfidential,
nonobligatory basis; no relationship, confidential or
otherwise, expressed or implied, is established with
Texas Instruments by this presentation. Texas
Instruments may use, copyright, distribute, publish,
reproduce, or dispose of the information in any way
without compensation to me."