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1993-04-19
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SPORTSTER 14,400
APPENDIX B. SUMMARIES AND TABLES
FRONT PANEL INDICATORS
Table B.1_LED Indicators
SymbolMeaning Status
AA Auto Answer/ Answer mode only: ON if DIP
switch 5 is UP (OFF) when
Answer the modem is
powered on, or register S0 is
set to 1 (Auto Answer mode),
and when answering a call;
OFF when the modem originates
a call.
CDCarrier DetectON if DIP switch 6 is UP
(factory setting) and the
modem receives a valid data
signal (carrier) from a
remote modem, indicating that
data transmission is
possible. Always ON if the
CD override is ON (DIP switch
6 DOWN).
OH Off Hook ON when the modem takes
control of the phone line to
establish a data link.
RDReceived Data Flashes when the modem sends
result codes or passes
received data bits to the
computer or terminal.
SD Send Data Flashes when the computer or
terminal sends a data bit to
the modem.
TRData Terminal ON if DIP switch 1 is UP
(factory setting) and the
modem
Ready receives a DTR signal from
the computer or terminal. Al
ways ON if the DTR override
is on, DIP switch 1 DOWN.
RS Request to ON if your computer or
terminal sends the RTS signal
Send (your computer or terminal
and software must support
RTS). OFF if the modem is
set to &R2 (Received Data
hardware flow control) and
the computer or terminal
lowers RTS.
CSClear to Send ON until the modem lowers CTS
when Transmit Data hardware
flow control is enabled (&H1,
&H3).
ARQ/Error Control/ Data Mode: Automatic
Repeat Request. ON when the
FAX Fax Operations modem is set to &M4 or
&M5 and successfully connects
with another modem under
error control. Flashes
randomly when the modem
retransmits data to the
remote modem.
Fax Mode: Flashes steadily
to indicate fax mode.
THE RS-232 INTERFACE
Description
The RS-232 interface is a standard
developed by the Electronic Industries
Association (EIA). It defines the
signals and voltages used when data is
exchanged between a computer or terminal
and a modem or serial printer.
The entire standard covers many more
functions than are used in most data
communications applications. Data is
transmitted between the devices over an
RS-232 cable with a 25-pin male (DB-25P)
connector to the modem and a 25-pin, 9-
pin, 8-pin or custom-built connector to
the computer or terminal.
Pin Assignments
Pin assignments are factory-set in the
Sportster 14,400 to match the standard
DB-25 assignments in the following
table. DB-9 connectors for IBM PC/AT-
compatible computers should be wired at
the computer end of the cable as shown
in the DB-9 column. If you're using an
Apple computer, ask your dealer for the
correct modem cable for your Apple
model.
Table B.2_RS-232 Interface Pin Definitions
Signal Source
DB-25 DB-9 Circuit Function
Terminal*_ Modem
1 _ AA Chassis Ground Both
2 3 BA Transmitted DataTerminal
3 2 BB Received Data Modem
4 7 CA Request to SendTerminal
5 8 CB Clear to Send Modem
6 6 CC Data Set Ready Modem
7 5 AB Signal Ground Both
8 1 CF Carrier Detect Modem
12 _ SCF Speed Indicate Modem
20 4 CD Data Terminal Ready
Terminal
22 9 CE Ring Indicate Modem
* Indicates terminal or computer.
Minimum Requirements
Some computer/terminal equipment
supports only a few of the RS-232 signal
functions set in the Sportster 14,400.
The minimum required for the modem to
operate is as follows.
Table B.3_Minimum Required Pins
DB-25 DB-9
Pin Pin Function
2 3 Transmitted
Data
3 2 Received Data
7 5 Signal Ground
20 4 Data Terminal
Ready*
* Required only if you have
the Data Terminal Ready
Override switch OFF (DIP
switch 1 UP).
Additional Flow Control Functions
If your computer and software support
Clear to Send and you wish to use
Transmit Data hardware flow control
(&H1), Pin 5 (DB-25) or Pin 8 (DB-9) is
required.
If your computer and software support
Request to Send and you wish to use
Received Data hardware flow control
(&R2), Pin 4 (DB-25) or Pin 7 (DB-9) is
required.
For 57.6K and 38.4K bps Serial Port Rate
Your software and terminal or computer
must support the 57.6K or 38.4K bps
rate. Make sure the RS-232 cable is
shielded. Cables are normally six feet
long, but longer lengths are possible.
If you encounter problems with signal
degradation, try a shorter cable.
If you decide to build your own cable,
use a low-capacitance cable. To further
minimize the capacitance, connect only
those functions (pins) that your
application requires.
DIP SWITCH SUMMARY
Purpose
The DIP switches, located at the rear of
the modem, are for adapting the modem to
your equipment and personal require
ments. The quick configuration guide
that came with the modem indicates the
recommended switch settings for many
communications software packages. If
your software isn't included, you may
need to review your software
documentation to set DIP switches 1 and
6 correctly for your program's
requirements.
Some users are able to move a single
switch with a finger tip. If this
doesn't work for you, use a toothpick or
other small instrument.
Operations
The DIP switch settings are power-on and
reset defaults, read by the Sportster
14,400 when the computer is turned on or
when you reset the modem. If changed
when the modem is on, switches 2-5
require the ATZ (software reset) command
to initiate the new settings. The
remaining (hardware) switches are
automatically operative when set UP or
DOWN.
Table B.4_DIP Switches
Factory
SwitchSetting Function
1 UP Data Terminal Ready (DTR)
Operations
UP Normal DTR operations:
computer or terminal must
provide DTR signal for
modem to accept commands;
dropping DTR terminates a
call
DOWN Modem ignores DTR
(Override)
2 UP Verbal/Numeric Result Codes
UP Verbal (word) results
DOWN Numeric results
3 DOWN Result Code Display
UP Results suppressed
DOWN Results enabled
4 UP Command Mode Local Echo
UP Keyboard commands
displayed
DOWN Echo suppressed
5 DOWN Auto Answer
UP Modem answers on first
ring
DOWN Auto answer disabled
6 UP Carrier Detect (CD) Operations
UP Modem sends CD signal
when it connects with
another modem, drops CD
on disconnect
DOWN CD always ON (Override)
7 UP Power-on and ATZ Reset
Software Defaults
UP Load from user-defined
nonvolatile memory
(NVRAM)
DOWN Load factory settings
from read only memory
(ROM)
8 DOWN AT Command Set Recognition
UP Command recognition
disabled (Dumb Mode)
DOWN Recognition enabled
(Smart mode)
DEFAULT SETTINGS
User-Programmable Defaults
You can create your own default
configuration and store it in
nonvolatile random access memory (NVRAM)
using the &W command described in
Chapter 5. As long as DIP switch 7 is
UP when you power on or reset the modem,
your defaults are loaded into the
modem's random access memory (RAM). To
view your NVRAM settings, use the ATI5
command.
Tables on the next two pages list the
options you can store in NVRAM,
including S-Register settings. If DIP
switch 7 is DOWN at power-on, the
factory settings listed in the tables
are loaded instead. The first time the
modem is turned on, the NVRAM settings
are the same as the factory settings.
The following command example
substitutes several user-defined
defaults for factory settings. The
modem also stores the rate, word length
and parity it detects from the command's
AT prefix, which depend on how you first
set those parameters in your software.
AT X4 &B1 &M5 &H1 M3 &W <Enter>
Table B.5_NVRAM Command Options
NVRAM Options Factory Setting
Handshake option B0 CCITT answer
sequence
Normal/error control (ARQ) mode &M4
Normal/ARQ
Data compression &K1 Auto enable/disable
Transmit data flow control &H0 Disabled
Rec'd data hardware flow control &R1 Ignore
RTS
Rec'd data software flow control &I0
Disabled
Serial port rate select&B0 Detect from AT
command; then follow
connection rate
Connection rate select&N0 Variable
Result code subset X1 Extended
Error-control response codes &A1 Enabled
Tone/Pulse dialing P Pulse dial
Online local echo F1 Disabled
Speaker control M1 ON during dial
through connect
Remote Digital Loopback (RDL) &T5 Deny RDL
Data Set Ready override&S0 Enabled
Break handling &Y1 Clear buffer, send
immediately
Stored telephone number&Zs Blank
Pulse dial make/break ratio &P0 U.S./Canada
Guard tone &G0 U.S./Canada
Word length* 7
Parity* Even
Serial port rate* 19.2K bps
* Detected by the modem from the AT prefix of
the &W command that writes your defaults to
NVRAM. Set your software to the desired word
length, parity, and serial port rate defaults
before sending the modem the AT . . . &W
string.
Table B.6_NVRAM S-Register Options
Factory
NVRAM S-Register Options Setting
S2 Escape code character 43
S3 Carriage Return character 13
S4 Line Feed character 10
S5 Backspace character 8
S6 Dial wait-time, sec. 2
S7 Carrier wait-time, sec. 60
S8 Dial pause, sec. 2
S9 Carrier Detect time, 1/10th
sec. 6
S10Carrier loss wait-time, 1/10th
sec. 7
S11Touch-Tone duration, spacing,
msec. 70
S12Escape code guard time, 1/50th
sec. 50
S13Bit-mapped functions 0
S14Bit-mapped functions 0
S15Bit-mapped functions 0
S19Inactivity/hang up timer 0
S21Break length, 1/100th msec.10
S22XON character 17
S23XOFF character 19
S25DTR recognition time, 1/100th
sec. 5
S27Bit-mapped functions 0
S28V.21/V.23 fallback delay,
1/10th msec. 8
S34Bit-mapped functions 6
S38Disconnect wait time, sec. 0
NOTE: Bit-mapped registers have up
to eight functions. See instruc
tions under S13 in the S-Register
Summary in this appendix or the
briefer summary in the Quick
Reference Card.
S-REGISTER SUMMARY
Usage
Users typically require the default
values. To change a setting, use the
ATSr=n command, where r is the register
and n is a decimal value from 0O255
(unless otherwise indicated).
The example below sets the modem's test
timer to 10 seconds.
ATS18=10 <Enter>
The modem does not perform a value-range
check. Some values you select may not
work with some equipment, and you'll
have to readjust the settings.
Use ATSr? to display the contents of a
register, as follows.
ATS20? <Enter>
Table B.7_S-Registers
Register Default Function
S0 See DIP Sets the number of rings
on which to an-
Switch 5 swer in Auto Answer Mode.
When DIP switch 5 is UP
the modem answers on the
first ring; S0=1 does the
same. When DIP switch 5
is DOWN (factory setting),
Auto Answer is disabled;
S0=0 (modem answers on 0
rings, or never) does the
same.
S1 0 Counts and stores the
number of rings from an
incoming call.
S2 43 Stores the ASCII decimal
code for the escape code
character. Default
character is I+U. A value
of 128O255 disables the
escape code.
S3 13 Stores the ASCII code for
the Carriage Return
character. Valid range is
0O127.
S4 10 Stores the ASCII decimal
code for the Line Feed
character. Valid range is
0O127.
Register Default Function
S5 8 Stores the ASCII decimal
code for the Backspace
character. A value of
128O255 disables the
Backspace key's delete
function.
S6 2 Sets the number of seconds
the modem waits before
dialing. If set to X2 or
X4, the modem ignores this
register and dials as soon
as it detects a dial tone
(fast dials).
S7 60 Sets the number of seconds
the modem waits for a
carrier. May be set for
much longer duration if,
for example, the modem is
originating an
international connection.
S8 2 Sets the duration, in
seconds, for the pause (,)
option in the Dial
command.
S9 6 Sets the required
duration, in tenths of a
second, of the remote
modem's carrier signal
before recognition by the
Sportster.
S10 7 Sets the duration, in
tenths of a second, that
the modem waits after loss
of carrier before hanging
up. This guard time
allows the modem to
distinguish between a line
hit, or other disturbances
that momentarily break the
connection, from a true
disconnect (hang up) by
the remote modem.
While we don't recommend
connecting the modem to a
line with call waiting, if
you have it, you may wish
to adjust this setting up
ward to prevent the modem
from misinterpreting the
second call signal as a
disconnect by the remote
modem. A better al
ternative is to ask your
phone company how to
temporarily disable call
waiting.
NOTE: If you set S10=255,
the modem will not hang up
when carrier is lost.
Dropping DTR will force
the modem to hang up.
Register Default Function
S11 70 Sets the duration and
spacing, in milliseconds,
of dialed Touch-Tones.
S12 50 Sets the duration, in
fiftieths of a second, of
the guard time for the
escape code sequence
(+++).
S13 0 Bit-mapped register.
Select the bit(s) you want
on and set S13 to the
total of the values in the
Value column. For
example, ATS13=17 enables
bit 0 (value is 1) and bit
4 (value is 16).
BitValue Result
0 1 Reset when DTR
drops
1 2 Reserved
2 4 Reserved
3 8 On DTR signal, Auto
Dial the number
stored in NVRAM
4 16 At power on/reset,
Auto Dial number
stored in NVRAM
5 32 Reserved
6 64 Disable MNP Level 3
(used for testing
Level 2)
7 128 Reserved
S14 0 Bit-mapped. Allowable non-
default value is 1.
BitValueResult
0 1 The modem hangs up
on receipt of +++,
returns to command
mode and sends the
NO CARRIER result
code; see Escape
Code Operations in
Chapter 6
1O7 _ Reserved
Register Default Function
S15 0 Bit-mapped register. To
set the register, see the
instructions for S13.
BitValueResult
0O2 _ Reserved
3 8 Reset non-ARQ mode
Transmit buffer
from 1.5K bytes to
128*
4 16 Disable MNP Level
4; retransmitting
the larger Level 4
data blocks may be
a problem if you
expect a great
number of errors
during a call
5O7 _ Reserved
*The 1.5K-byte non-ARQ buffer allows
data transfer with X- and Ymodem-type
file transfer protocols without using
flow control.
The 128-byte option allows remote users
with slower modems to stop data you're
transmitting from scrolling off their
screens. When remote users send your
computer an XOFF (Ctrl-S) and you stop
transmitting, the data in transit from
your modem's buffer doesn't exceed the
size of their screen.
S16 0 Bit-mapped test register.
Allowable value is 2. For
information on the Dial
test (used in factory
testing), see Appendix F.
BitValueResult
0 _ Reserved
1 2 Dial test
2O7 _ Reserved
S17 0 Reserved.
S18 0 Test timer for &Tn
loopback testing. Sets
the duration of testing,
in seconds, before the
modem automatically times
out and terminates the
test. When S18 is set to
0, the timer is disabled.
See Appendix F for test
instructions.
Register Default Function
S19 0 Sets the duration, in
minutes, for the Inac
tivity Timer. The timer
activates when there is no
data activity on the phone
line; at timeout the modem
hangs up. S19=0 disables
the timer.
S20 0 Reserved.
S21 10 Sets the length, in 10-
millisecond units, of
Breaks sent from the modem
to the computer or
terminal; applies to ARQ
mode only.
S22 17 Stores the ASCII decimal
code for the XON
character. Valid range is
0O127.
S23 19 Stores the ASCII decimal
code for the XOFF
character. Valid range is
0O127.
S24 0 Reserved.
S25 5 Sets the duration, in
hundredths of a second,
that DTR must be dropped
so that the modem doesn't
interpret a random glitch
as a DTR loss. (Most
users will want to use the
default; this register is
useful for setting
compatibility with older
systems running under
older operating software.)
S26 0 Reserved.
S27 0 Bit-mapped register. To
set the register, see the
instructions for S13.
BitValue Result
0 1 Enable CCITT V.21
modulation at 300
bps for overseas
calls; in V.21
mode, the modem
answers both over
seas and domestic
(U.S. and Canada)
calls, but only
originates V.21
calls
S27 continued on following page
Register Default Function
S27 (cont.) Bit Value
Result
1 2 Enable unencoded
(non-trellis-
coded) modulation
in V.32 mode;
rarely used part
of CCITT
Recommendation
V.32
2 4 Disable V.32
modulation
3 8 Disable 2100 Hz
answer tone to
allow two V.42
modems to connect
more quickly
4 16 See below
5 32 See below
6 64 Reserved
7 128 Unusual software
incompatibility.
Some software may
not accept 7200,
12,000 and 14,400
bps result codes.
This setting
disables the codes
and displays the
9600 code instead.
Error control handshaking
options: select the total
values of bits 4 and 5.
Bit 4 Bit 5 Result
0 0 Complete
handshaking
sequence: V.42
Detection, LAPM
error control,
MNP.
16 0 Disable MNP.
0 32 Disable V.42
Detection and
LAPM.
16 32 Combined value of
48 negotiates LAPM
without Detection
phase. Choose
this value if the
remote modem uses
LAPM but does not
support the
Detection phase.
Register Default Function
S28 8 Sets the duration, in
tenths of a second, of the
EIA-specified Multimode
Training. Default = 8 (.8
seconds). This gives V.32
bis modems additional time
to connect with most
U.S./Canada modems at 9600
bps or higher before
falling back to attempt a
V.23 connection (some U.K.
modems, 1200 bps) or a
V.21 connection (European
modems, 300 bps).
If calling/answering low-
speed, overseas modems
under V.21 or V.23
modulation, setting S28 to
zero eliminates the delay,
giving a faster connect
time.
S29 20 Reserved for USRobotics'
internal use.
S30 0 Reserved.
S31 0 Reserved.
S32 1 Reserved.
S33 0 Reserved.
S34 6 Bit mapped. Allowable
values are S34=6, S34=7,
S34=14, and S34=15.
BitValueResult
0 1 Disable V.32 bis.
Used for
troubleshooting;
USRobotics'
Technical Support
may require that
you disable V.32
bis for testing
purposes.
1O2 _ Reserved
3 8 Enable V.23
modulation
4O7 _ Reserved
S35 0 Reserved.
S36 0 Reserved.
S37 0 Reserved.
Register Default Function
S38 0 Sets an optional delay, in
seconds, before a forced
hang-up and clearing of
the Transmit buffer when
DTR drops during an ARQ
call. This allows time
for a remote modem to
acknowledge receipt of all
transmitted data before it
is disconnected. Default
= 0: the modem
immediately hangs up when
DTR drops.
This option only applies
to connections terminated
by dropping DTR. If the
modem receives the ATH
command, it ignores S38
and immediately hangs up.
ASCII CHART
The following chart may be useful for
programming.