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1993-05-10
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CHAPTER 2. SET-UP AND TESTING
Figure 2.1êCourier High Speed Modems
PACKAGE COMPONENTS
Your Courier modem package contains the
following items in addition to this
manual:
ù The modem you purchased: Courier
HST Dual Standard, Courier HST or
Courier V.32 bis.
ù A quick-configuration listing of
Courier DIP switch and other
settings recommended for a number
of popular communications software
products, plus tips for a quick
startup.
ù An RJ11C phone cord.
ù A power adapter.
ù A Quick-Reference card, in this
manual.
ù Your warranty card, to be filled
out and returned to U.S. Robotics,
Inc.
OPERATIONAL REQUIREMENTS
The Courier modem has minimal
operational requirements. Be sure to
read the information in the front of
this manual about radio and television
interference and connecting to the phone
company. In addition, you should be
aware of the following conditions.
ù Follow the operating instructions
in Appendix E, Dedicated Line and
Leased Line Operation, if your
phone line is user-installed or if
it is leased from the telephone
company. Also referred to as
private, these lines are used for a
direct, continuous connection
between two modems. The connection
is made without dialing.
ù If your modem is installed in a
Hewlett Packard system that uses
the Ack/Enq communications
protocol, be sure to follow the
instructions at the end of Appendix
E.
ù If the modem is attached to a
computer instead of a terminal, you
need communications software. The
software uses the modem's AT
command set to control many
communications functions, including
configuring the modem, dialing, and
answering calls, and also enables
the transfer of files and other
operations.
Some users prefer their communica-
tions software to take control of
the modem, and are more comfortable
with a program that makes the modem
almost transparent. Others prefer
a program that allows them to use
the modem's AT command set some-
times, and their software at other
times, depending on the task at
hand. Whichever you prefer, review
at least the Quick Start (Chapter
3) so that you have a basic
understanding of the modem's
requirements and operation.
RS-232 Requirements
You'll need an RS-232 cable to connect
the modem to your computer or terminal.
Use a shielded cable to ensure minimal
interference with radio and television
reception.
The modem takes a DB-25P (25-pin plug,
or male) connector at one end of the
cable. Computer equipment varies,
however. Check the serial port at the
rear of your machine, which may be
labeled SERIAL, COMM PORT, or some other
term (e.g., RS-232). If there are no
labels, review your machine
documentation to find out which is the
serial port. (There may be more than
one.) Don't use a port marked PARALLEL,
PRINTER or AUX.
The physical serial port on the computer
or terminal will be either a socket
(female) or plug (male) that typically
accommodates 25 or 9 pins. For example,
the port on the IBM PC, PC/XT and most
compatibles requires a DB-25S (socket)
connector, while the port on the IBM
PC/AT and some compatibles requires a
DB-9S connector. Apple computers
require a DB-25P, DB-9P or, more
typically, an 8-pin round plug
connector. Check your computer
documentation or with your computer
dealer.
NOTE: Appendix B includes a listing of
RS-232 pin assignments required to
operate the modem. Be sure to check the
appendix if you're not sure what type of
cable you need, or if you're building
your own. If your machine has other
than a 25- or 9-pin port, check your
computer documentation or consult your
dealer to find out what type of RS-232
connector is required.
WARNING: If you're planning to use the
high speed computer-to-modem rates of
57.6K or 38.4K bps, follow the
instructions concerning the RS-232 cable
in Appendix B. The guidelines there
will help you to avoid signal
degradation at very high speeds.
FRONT PANEL SWITCHES
Voice/Data
This pushbutton switch is used primarily
to switch between voice and data
communications during a call. Detailed
instructions are in Appendix E,
Voice/Data Calls. The switch has
multiple functions, however. Options
are as follows:
Disable the switch
Force the modem off hook in Originate
mode (default)
Force the modem off hook in Answer
mode
Have the modem redial the last dialed
number
Have the modem dial the first number
you've stored in nonvolatile memory
Toggle Auto Answer on and off
Reset the modem to its defaults
Initiate Remote Digital Loopback
testing
Busy out the phone line
Volume Control
This is a rotary switch under the front
panel, near the right corner. Turning
it clockwise increases the volume of the
modem's speaker. Turning it counter-
clockwise decreases the volume.
FRONT PANEL INDICATORS
Below is a list of the modem's twelve
status lights, or LEDs. See Appendix B
for descriptions of their operations.
HS High Speed TR Data Terminal Ready
AA Auto Answer MR Modem Ready
(Power)
CD Carrier Detect RS Request to Send
OH Off Hook CS Clear to Send
RD Received Data SYN Synchronous
SD Send Data ARQ Automatic Repeat
Request
(Error Control)
INSTALLING THE MODEM
1. Turn off the computer or terminal and
its peripheral devices.
2. Examine the label on the bottom of
the modem. In addition to the
summaries and other information, the
label contains icons to aid in modem
assembly. Check the interfaces at
the back of the modem, shown in the
following photograph.
Figure 2.2êInterface End, Courier Modem
3. Now review the attached interfaces in
Figure 2.3.
Figure 2.3êConnected Courier Modem
4. Check to make sure that the power
switch is OFF; press it towards the
zero in the 0/1 icon on the bottom
label. Plug the power supply
adapter's small connector into the
power jack at the back of the modem.
Plug the adapter into a standard 115-
volt AC wall socket.
Disconnect your present phone cable
from the wall jack. Plug one end of
the phone cable that came with the
modem into the modem's phone jack
that is near the wall-jack icon on
the bottom label. Plug the other end
into the wall jack.
NOTE: Older telephone installations
may not have the appropriate modular
wall jack and plug. Adapters and
RJ11C connectors are available from
your telephone company or computer
dealer.
If you want to keep your telephone
connected for conventional calls,
plug its cord into the jack at the
rear of the modem near the phone
icon. You can also use both your
telephone and modem in one call,
although not at the same time.
Voice/Data, in Appendix E, explains
how to switch control of the phone
line between the phone and the modem.
5. Next, check the positions of the bank
of Dual In-Line Package (DIP)
Switches located in the well at the
bottom of the modem. These switches
are set at the factory to the
positions most users require.
.G.
Figure 2.4êDIP Switch Factory Settings
The quick-configuration guide that
came with the manual shows
recommended switch settings for many
widely-used communications software
products. If your communications
software is not listed, check your
software documentation for its
requirements, particularly for DIP
switches 1, 4, 5
and 6. You'll also find descriptions
of switch functions and options in
Appendix B.
If you already know your
requirements, use the guide on the
bottom of the modem or the summary in
the Quick Reference Card to verify
the switch positions.
NOTE: If you have built your own RS-
232 cable and it does not support
Data Terminal Ready (DTR), set DIP
switch 1 DOWN, for the DTR override.
The override causes the modem to
operate as if the DTR signal is
always ON, and enables the modem to
accept commands. Most purchased
communications software, however,
requires DTR.
DIP switch 10 is explained under
Setting/Using Defaults in Chapter 5.
Most users will want to leave this
switch OFF, write their own defaults
to nonvolatile memory (NVRAM), and
have those defaults loaded at power
on.
The wider Quad switch on the right of
the numbered switches should be left
UP unless you know your equipment
reverses the transmit and receive
pins at the RS-232 interface (see
Appendix B, DIP Switch Summary).
6. The final step is to connect the
modem to the computer's or terminal's
serial port with the RS-232 cable
described earlier in this chapter.
Attach the appropriate connectors to
the modem and to the serial port.
NOTE: To prevent overheating, do not
cover the vents on the top of the modem
case.
The modem is now ready to be tested and
operated.
TESTING THE INSTALLATION
Use the following procedures to verify
that your modem is working properly.
1. Turn on your computer or terminal and
clear the screen. Then turn the
Courier's power switch ON. The
following front panel indicators, or
LEDs, will light up.
CD Carrier Detect, if you have set
DIP switch 6 DOWN, enabling the CD
override
MR Modem Ready/Power ON
CS Clear to Send
TR Data Terminal Ready, if you have
set DIP switch 1 DOWN, enabling
the DTR override
For more information on the front
panel indicators, see Appendix B.
2. Set your terminal or software to
19.2K bps or 9600 bps. In addition,
set a word length of either 7 bits
plus 1 parity bit, or 8 bits with no
parityêit doesn't matter which
nowêand 1 Stop bit.
3. If you're using a personal computer,
load your communications software.
If your software allows, perform the
function that lets you send AT
commands to the modem, that is, puts
the computer in Terminal Mode. Some
communications programs do this
automatically upon loading. Others
require you to display a
communications or terminal screen,
type a Function key, or perform some
other operation.
If necessary, refer to your
communications software documentation
for instructions.
4. Check to see if your computer or
terminal and modem are communicating
with each other by sending the
following attention command. Type
either upper or lower case letters,
not a combination, and then press the
Enter (Carriage Return) key, shown in
the example below between angle
brackets. (Don't type the angle
brackets.)
AT <Enter>
If everything is correct, the modem
responds as follows:
OK
NOTE: The modem is shipped with DIP
switch 4 UP, causing the modem to
display (echo) your keyboard
commands. If your entered command is
not displayed, your local echo is
OFF. To turn the local echo ON, send
the modem the following command.
ATE1 <Enter>
If double characters appear on the
screen, both your modem and software
are set to local echo ON. Either set
your software to local echo OFF, or
turn the modem's echo OFF with the
following command.
ATE0 <Enter>
Troubleshooting
If no OK appears on your screen, review
the following checkpoints.
a. Make sure you type all upper or lower
case letters and press <Enter>.
b. Check to see that you set your
communications software to the
correct serial port.
c. Make sure your software has put the
computer in Terminal mode, so that
you can send the modem commands.
Then review Step 4, above.
d. Be sure that DIP switches 1 and 6 are
set ON or OFF according to your
terminal or software requirements.
The table in Appendix B explains each
function, and you may also need to
review the quick-configuration guide
or your terminal or communications
software documentation .
e. The Quad switch on the right should
be in the UP position.
f. If you set DIP switch 8 UP, for Dumb
mode, reset the modem to Smart mode:
set DIP switch 8 DOWN, power off the
modem, and power it on again.
g. DIP switch 3 controls the display of
the modem's result codes, including
the OK result. The modem is shipped
with DIP switch 3 DOWN, enabling the
result codes. If DIP switch 3 is UP,
reset it to the DOWN position. Then
initiate the new switch setting with
the following reset command.
ATZ <Enter>
5. A final check of the modem is to see
that it gets a dial tone. Type the
following manual Dial command:
ATD <Enter>
On receipt of the command, the modem
goes off hook and waits for a dial
tone. The OH indicator lights, and
you'll hear the dial tone from the
modem's speaker. To cancel the
operation, press any key.
If you don't hear the dial tone,
first increase the volume by sliding
the volume control switch towards the
front of the modem. If that doesn't
work, check to see that the phone
cable from the wall jack is connected
to the correct jack on the modem.
The correct connection is to the jack
identified by the wall jack icon on
the bottom label of the modem case,
not the phone icon. If necessary,
reconnect the phone cable correctly.
Then try the manual Dial command
again, ATD <Enter>.