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TWO.TXT
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1993-04-19
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SPORTSTER 14,400
CHAPTER 2. SET-UP AND TESTING
Figure 2.1_Sportster 14,400 Modem
PACKAGE COMPONENTS
Your modem package contains the
following items in addition to this
manual.
∙ The Sportster 14,400 modem.
∙ An RJ11C phone cord.
∙ A power adapter.
∙ A tear-out Quick-Reference Card, at
the back of this manual.
∙ A supplemental guide to a number of
popular communications software
products. This quick configuration
guide provides modem DIP switch
settings, information on important
program features and helpful hints
for using the software with your
U.S. Robotics modem.
∙ Your warranty card, to be filled
out and returned to U.S. Robotics,
Inc.
REQUIREMENTS_COMMUNICATIONS SOFTWARE
If the modem is attached to a computer
instead of a terminal, you'll need
communications software to operate the
modem. Communications software makes it
possible for your computer to send and
receive data via the modem and phone
lines. It also interacts directly with
the modem. Many excellent compatible
programs are available, all based on the
AT command set.
Some users prefer their communications
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 commands or
menus at other times, depending on the
task at hand.
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/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 this 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.
NOTE: If you build your own cables and
plan to use the fastest computer-to-
modem rate of 57.6K bps, follow the
instructions concerning the RS-232
cable in Appendix B. These guidelines
will help you to avoid signal
degradation at the 57.6K bps rate.
HARDWARE FEATURES
The following switches and indicators
are located on the exterior of the
modem case.
Power Switch
The power switch is located on the left
side of the modem case. It is a push-
button type switch; in the OFF
position, it protrudes a little farther
from the case.
Volume Control Switch
There is a rotary switch under the
front panel, near the right corner.
Turn it clockwise to increase the
volume of the modem's speaker; turn it
counter-clockwise to decrease the
volume.
Front Panel Indicators
Below is a list of the modem's nine
status lights, or LEDs. See Appendix B
for descriptions of their operations.
AA Auto Answer
CD Carrier Detect
OH Off Hook
RD Received Data
SD Send Data
TR Data Terminal Ready
RS Request to Send
CS Clear to Send
ARQ/FAX Automatic Repeat Request
(Error
Control)/Fax Mode (Fax
modems only)
DIP Switches
An eight-position bank of Dual In-Line
Package (DIP) switches is at the rear
of the modem. These switches are set
at the factory to the positions most
users require.
Figure 2.2_DIP Switch Factory Settings
The quick configuration guide that came
with the modem shows recommended switch
settings for many widely-used communica
tions 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. A description
of DIP switch functions and options is
in Appendix B in this manual and in the
Quick-Reference Card; a summary is on
the case bottom label.
DIP switch 7, used to load power-on and
reset defaults, is explained under
Setting/Using Defaults in Chapter 5.
Most users will want to leave this
switch UP, write their own defaults to
nonvolatile memory (NVRAM), and have
those defaults loaded at power-on or
reset.
INSTALLING THE MODEM
1.Turn off the computer or terminal and
peripheral devices.
2.Check the interfaces and labels at
the back of the modem. From left to
right, notice that there are jacks
labeled TELCO and PHONE, the DIP
switches, the RS-232 connector and
the power jack.
3.Now review the attached interfaces in
Figure 2.3.
Figure 2.3_Connected Sportster 14,400 Modem
4.Plug the power 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.
5.Disconnect your present phone cable
from the wall jack. Plug one end of
the phone cable that came with the
modem into the jack at the rear of
the modem labeled TELCO. This allows
the modem to switch into the
telephone network, get a dial tone,
and so on. Plug the other end of the
cable into the wall jack.
NOTE: The phone cable is equipped
with two standard, modular RJ11C
phone connectors. If you have an
older type of wall jack, you can
purchase an adapter and RJ11C con
nector from your telephone company or
computer dealer.
6.If you wish, plug your phone's cord
into the second jack on the modem,
labeled PHONE. This enables you to
use your phone for conventional voice
calls, and also allows you to switch
between voice and data transmission
in the same call. See Voice/Data
Communications in Appendix E.
7.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 or sides of
the modem case.
The modem is now ready to be tested and
operated.
TESTING THE INSTALLATION
Follow these steps to verify that the
modem is working properly.
1.Turn on your terminal or computer.
Then press the Sportster 14,400's
power switch at the side of the case
to turn the modem ON. The following
front panel indicators, or LEDs, may
light up.
CDCarrier Detect, if you have set
DIP switch 6 DOWN, enabling the CD
override
TRData Terminal Ready, if you have
set DIP switch 1 DOWN, enabling
the DTR override
CSClear to Send, if Clear to Send is
supported by your computer or
terminal
2.If you're using a personal computer,
load your communications software and
start the program.
3.Set the software's serial port rate
to 38,400, 19,200 or 9,600 bits per
second (or "baud rate," for some
software). We recommend 19,200 or
38,400. The modem will detect this
rate automatically when you send it a
command. If your soft-ware supports
57,600 bits per second, you can set
your serial port to that speed.
4.Specify the serial communications
port used by the modem. IBM PC-
compatible software requires a
communications port address in the
form of COM1, COM2, or higher. Other
software may offer Communications,
Phone, or other options.
5.Set the data format to a word length
of either 7 bits plus Even or Odd
parity, or 8 bits with no parity_it
doesn't matter which for now_and 1
Stop bit. Some programs use formats
such as 7-E-1 or 8-N-1 for these
three parameters.
6.Perform the function that lets you
send AT commands directly 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, press a Function key, or per
form some other operation. If
necessary, refer to your com
munications software documentation
for instructions.
7.Check to see if your computer and
modem are communicating with each
other by sending the modem 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 local echo ON, type 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 these checkpoints to try to
correct the problem. Then try the AT
command again.
a. Make sure you type either all
upper case or all 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. Review Step 6 on the
previous page.
d. Be sure that DIP switches 1
and 6 are set UP (Off) or DOWN
(On), according to your software
requirements. Check the quick
configuration guide that came with
the modem, or review the table in
Appendix B and your communications
software documentation if you're
unsure.
e. If you set DIP switch 8 UP for
Dumb mode, reset the modem to Smart
mode by setting DIP switch 8 DOWN.
f. 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 and
then initiate the new switch
setting with the following reset
command.
ATZ <Enter>
Now try again to obtain the OK
result code by typing AT.
8.Make a final check of the modem to
see that it gets a dial tone. Type
the following manual Dial command.
ATD <Enter>
On receiving the command, the modem
goes off hook and waits for a dial
tone. The OH (Off Hook) indicator
lights, and you'll hear the dial tone
from the modem's speaker. If you
don't hear the dial tone, increase
the volume by turning the volume
control switch higher (clockwise).
To cancel the operation, press any
key.
If you don't hear a dial tone, check
to see that the phone cable from the
wall jack is connected to the jack
labeled TELCO on the modem. If
necessary, reconnect the phone cable
correctly to the TELCO jack, and try
the ATD command again.
Be sure to return the modem on hook
by pressing any key.