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Aminet AMIGA CDROM (1994)(Walnut Creek)[Feb 1994][W.O. 44790-1].iso
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APD.TXT
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1993-05-10
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COURIER HST
APPENDIX D
PROBLEMS AND SOLUTIONS
You may occasionally encounter one of the problems listed here.
They are divided into two categories: before and during the
exchange of user information over the data link.
-----------------------------------------------------------------
PROBLEM SUGGESTED SOLUTION
-----------------------------------------------------------------
Before Establishment of the Data Link
-----------------------------------------------------------------
Your modem . . .
Doesn't answer the phone or go "off hook" to dial a number
Check to make sure your computer or terminal is sending a Data
Terminal Ready (DTR) signal via the RS-232C interface. See
Appendix B-1 and Appendix B-3, DIP switch 1.
Doesn't respond OK when you type AT <Enter>
1. Make sure you're typing in either upper case or lower case
letters, not a combination, and that you press the Enter
key.
2. If you're using a computer, make sure it is in Terminal
Mode.
3. Check to see that your terminal or software is set to the
correct bit rate and word length (7 bits with or without a
parity bit, or 8 bits and no parity). If you're using a
computer, make sure your software is set to the correct
communications port.
4. Check that DIP switch 3 is DOWN, for result code display,
and that DIP switch 2 is UP, for verbal result codes. If
not, change the switch(es) and issue ATZ <cr>. Or issue
whichever of these commands is needed:
ATQ0 <Enter> (to display the message)
ATV1 <Enter> (to display a verbal message)
5. Your machine may require the Carrier Detect override (DIP
Switch 6 DOWN), but you've changed the factory setting.
Check Appendix B-3.
6. A rare condition is that your terminal/computer reverses the
send/receive functions at the RS-232C interface. See
Appendix B-1, Appendix B-3, Quad switch, and your equipment
documentation.
D-1
COURIER HST
-----------------------------------------------------------------
PROBLEM SUGGESTED SOLUTION
-----------------------------------------------------------------
Before Establishment of the Data Link
-------------------------------------
Your computer . . .
Reacts as though a data link has been established, but no call
has been received
DIP Switch 6 is set DOWN at the factory for Carrier Detect
override, but your system may be reacting to improper signals
received at the RS-232C interface. Set DIP switch 6 UP (OFF).
When the modem is in Answer Mode, acts as if a Carriage Return
has been entered, but nothing has been typed at the keyboard
Your software may be misreading signals from the modem as it
automatically sends a Carriage Return and a Line Feed before and
after the RING and CONNECT messages. Entering the Quiet Mode
command, ATQ1 <cr>, should solve the problem.
Both modems . . .
Exchange carrier signals, but fail to establish a communications
link
1. Check to make sure the proper bit rate, word length, parity
and number of Stop bits have been selected.
2. If that doesn't correct the problem, it's likely that the
quality of the phone connection is poor and that the other
modem is missing the signals your modem is transmitting.
The variable quality of phone line connections may be due to
any number of conditions in the phone service's equipment or
the current environment. Try several calls, and if you
still can't get through, try calling another modem. If the
second modem accepts your call, the problem may lie with the
modem you first tried to call.
3. Make sure the modem at the other end of the line is USR-HST
compatible at 9600 bps, V.22bis-compatible at 2400 bps, Bell
212A-compatible at 1200 bps, or Bell 103-compatible at 300
bps. These are the common signaling standards for full
duplex dial-up network transmission in the U.S.
-----------------------------------------------------------------
PROBLEM SUGGESTED SOLUTION
-----------------------------------------------------------------
D-2
COURIER HST
During Data Transfer
-----------------------------------------------------------------
Your screen displays . . .
Only brackets
Check to make sure both modems are at the same bit rate, word
length, parity and number of Stop bits. If the settings are
correct, the problem may be with the phone line. Try the
following measures:
1. Try placing the call again. The phone company routes even
local calls differently each time you call.
2. Try calling a different modem to see if the problem
persists. (However, if it does, the problem may still be
with the phone line.)
3. If you are using a long-distance service and the problem
persists, you might try using a different service.
Random (garbage) characters
Make sure both modems are set at the same bit rate, word length,
parity, and number of Stop bits.
Double characters
The modem's online local echo is probably ON. Return the modem
to Command Mode (use +++) when it's convenient, and then type:
ATF1 <Enter>
-----------------------------------------------------------------
IF YOU STILL HAVE PROBLEMS
The problems described above are by far the most common ones
that users encounter. If the suggestions we've given don't clear
up your difficulties, try the following:
1. Review the manual carefully to see if you've missed
something.
2. Call or visit your dealer. Chances are your dealer will be
able to give you the assistance you need. This is much more
efficient and time-saving than returning the modem to
USRobotics.
D-3
COURIER HST
3. If your dealer can't clear up your difficulties, call the
USRobotics Technical Support Department at 800/982-5151 (in
Illinois, 312/982-5151). Our Service Representatives will
be happy to give you assistance over the phone Monday
through Friday from 8:30 a.m. to 5 p.m. (Central Time Zone).
4. If necessary, the Service Representative you talk to may
give you a Return Materials Authorization (RMA) number.
Modems without an RMA number will not be accepted.
5. If you do return the modem to us, please follow this
procedure --
a. Ship the unit, postage paid, in its original container.
If the original container is not available, pack the
modem carefully in a strong box of corrugated cardboard
with plenty of packing material.
b. Be sure to include your RMA number inside the package,
along with your name and address. Put your return
address and your RMA number on the shipping label as
well.
c. Ship the well-packed modem to the following address.
Technical Support Department
USRobotics, Inc.
8100 North McCormick Boulevard
Skokie, Illinois 60076
d. Please note that USRobotics will not accept packages
sent COD, so be sure to send the modem postage paid.
e. USRobotics will repair your modem and return it to you
via United Parcel Service.
D-4