Category : Communication (modem) tools and utilities
Archive : SP144MAN.ZIP
Filename : APD.TXT
Output of file : APD.TXT contained in archive : SP144MAN.ZIP
You may occasionally encounter one of
the problems listed here. They are
divided into two categories: before and
during the exchange of data over the
phone link.
Before the Modems Connect
Your modem . . .
Doesn't answer the phone or go off hook to
dial a number
Review the quick configuration guide or
your software manual to see what Data
Terminal Ready (DTR) operations your
software requires. Then check to see if
DIP switch 1 is set correctly.
Doesn't respond OK when you type AT
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.Make sure your computer is in
Terminal mode. This is a
communications software function.
See Testing the Installation in
Chapter 2.
3.Check to see that your 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).
Also make sure your software is set
to the correct communications
(serial) port, as determined in the
setup instructions in Chapter 2,
under Selecting a Serial Port.
4.Check that DIP switch 8 is DOWN, for
command set recognition. If the
switch is UP, set it DOWN and try
typing AT
5.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 type ATZ
whichever of these commands is
needed.
ATQ0
ATV1
codes)
6.Review the quick configuration guide
that came with the modem or your
communications software manual to see
what Carrier Detect (CD) operations
your software requires. Then check
to see if DIP switch 6 is set
correctly.
Displays double characters
Both your modem and software's local
echo are on. You can turn your
software's local echo off, or turn the
modem's echo off by either resetting DIP
switch 4 and sending the modem the ATZ
command, or by sending the modem the
ATE0 command.
Your computer . . .
Reacts as though a data link has been
established, but no call has been received
Review the quick configuration guide
that came with the modem or your
communications software manual to see
what Carrier Detect (CD) operations are
required. Then check to see if DIP
switch 6 is set correctly.
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 Line Feed before
and after the RING and CONNECT messages.
Sending the Quiet Mode command, ATQ1
Both modems . . .
Exchange carrier signals, but fail to
establish a communications link
1.If you have a fax modem, make sure
you are in the correct mode for the
call you are receiving. The modem
must be in data mode to receive a
data call, and in fax mode to receive
a fax call. See Fax Operations in
Appendix E for information on
switching between fax and data modes.
2.Check to make sure that you've set
your software to the same word
length, parity and number of Stop
bits required by the remote computer
and, if your modem is dialing out,
that your software is set to a bit
(or baud) rate equal to or higher
than that of the remote modem.
3.Make sure the modem at the other end
of the line is V.32 bis-compatible at
14.4K, 12K, 9600, 7200 or 4800 bps,
V.32-compatible at 9600 bps, V.22 bis-
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.
4.Make sure your modem's link rate
setting, &Nn, is correct for the
call. If the link rate is locked at
a speed (&N1O&N8) different from the
calling modem's, the Sportster hangs
up. The factory setting of &N0,
variable link operations, allows the
two modems to negotiate the highest
possible link rate.
5.If these steps fail to 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 an
other modem. If the second modem
accepts your call, the problem may
lie with the modem you first tried to
call.
During Data Transfer
Your screen displays . . .
Only brackets
Check to make sure that your
communications software is set to the
same bit rate (or higher) as that of the
remote modem, and that both your
software and the remote system are set
to the same 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.Place the call again. The phone
company routes even local calls
differently each time you call.
2.Call a different modem to see if the
problem persists. The problem may be
with the modem you first tried to
call.
Random or garbage characters
Check to make sure that your
communications software is set to the
same bit rate (or higher) as that of the
remote modem, and that both your
software and the remote system are set
to the same word length, parity and
number of Stop bits. If the settings
are correct, the problem may be with the
phone line.
If the modem is set to a fixed serial
port rate (&B1) and your software is
fixed at 19.2K, 38.4K, or 57.6K bps, the
reason may be one of the following.
1.If you use memory-resident programs
(TSRs), they may be interfering. Try
disabling them before you run your
communications software. The same is
true of disk-caching programs.
2.Check to see that your software and
the modem are set for the same kind
of flow control, either hardware or
software. Some communications
programs also require that you dis
able the kind you are not using.
Double characters
Your modem's online local echo is on and
the remote computer is also echoing.
There are two ways to handle this: one
is to terminate the call, hang up, turn
off the online echo (ATF1) when the
modem is in Command mode, and call
again. This way you will not lose any
data. The second, riskier way is to
force the modem into Online-Command mode
by sending the escape code and to send
the modem the ATF1 O command. The
command turns off the online echo and
returns the modem online. Use this
second method only if the remote system
and your modem are not in the middle of
data transfer.
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.
3.If your dealer can't clear up your
difficulties, call the USRobotics
Technical Support Department at 800-
982-5151 Our Service Representatives
will be happy to give you assistance
over the phone Monday through Friday
from 7:30 a.m. to 6 p.m. (Central
Time Zone). If you prefer, you can
contact us by fax at 708-982-0823.
4.If it is necessary to return the
modem for service, the Service
Representative you talk to will give
you a Return Materials Authorization
(RMA) number.
If you do return the modem to us,
please use the following procedures.
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 card
board 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. Modems
without an RMA number will not be
accepted.
c.Ship the well-packed modem to the
following address.
Technical Support Department
U.S. Robotics, Inc.
8100 North McCormick Boulevard
Skokie, Illinois 60076-2999
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.
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