Hardware manual

5901 High Speed Dialup Modem Hardware Manual
October 19, 2007
23
7 Troubleshooting
To determine the source of a problem when using the 5901 modem always check the status register
of the DIAL or INIM function. The value stored in status register will indicate the type of problem.
Refer to the help file in the TelePACE program or to the TelePACE Reference and User Manual.
To determine the configuration of the 5901 modem use the &V command. The command format is:
AT &V
The modem will display the contents of all configuration registers. See section 10.2-
AT Command Set for details on the &V command.
Problem
Solutions
Modem does not
auto-answer.
Ensure modem is properly powered.
Ensure telephone line is connected to modem.
Check the setting of the S0 register. This register must have
a value of at least 1 for the modem to auto-answer.
Modem will not
dial out.
Ensure modem is properly powered.
Ensure telephone line is connected to modem.
Check the setting of the S6 register. Dial tone may not be
present before this register times out.
Modems make
connection but
controllers do not
communicate.
Check for correct station address in MSTR functions.
Check that both stations are using same protocol.
If the telephone line is noisy try using Modbus ASCII
protocol.