TR-2100 User Manual 89
Appendix IV – Troubleshooting
The first indication that a TR-2100 is not functioning correctly is normally that it will not
make a remote connection. Before going on site, it is worth checking the phone line by
ringing the TR-2100’s number and listening for the phone to be answered by the modem,
followed by a series of tones. If these are heard, then the phone line and modem are OK and
there is power to the TR-2100. If a data switch or DTMF switch is being used, then the
phone may be answered but no tones will be heard.
If this is successful, contact the TR-2100 using a terminal package such as Hyperterminal™
in Windows™. After the modem has issued a ‘CONNECT’ message, press <Enter> 3 or 4
times. The TR-2100 should return with a list of configuration parameters. If this is
successful, the fault may be with the Comms Manager set up of Display Station. To
disconnect from the TR-2100 using a terminal, type “quit” then press <Enter>.
Off-Site Checks
Problem: Modem doesn’t answer.
Things to check: Correct phone number?
Telecom wiring at substation?
If a data switch is used is it powered up?
Is TR-2100 powered up? (see below)
Is initialization string at TR-2100 correct? (S0=1)
Problem: Modem answers but is unable to communicate with TR-2100.
Things to check: Are initialization strings at Display Station & TR-2100
correct?
Is TR-2100 active? (see below)
Recommended initialization string for Pace modems:
AT&F^M~~~~ATS0=1^M
Recommended initialisation string for US Robotics modems:
AT&F1^M~~~~ATS0=1&G2&W^M
All Hayes compatible commands must begin with ‘AT’. The ^M symbols are interpreted as
if the <Enter> key has been pressed. The ~ symbol is interpreted as a short delay.
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