Gasboy CFN Series Diagnostic Manual - Manual (Page 53)

Site Controller I
0021 2-27
Possible Cause Checks Corrective Action
Short haul modem off, offline,
disconnected, or bad Check both modems at site
and terminal. If off, turn on; if offline, put
online; if disconnected,
reconnect. If possible
perform a loopback test on
the modem. Refer to
manufacturer's instructions
for loopback test. Replace if
none of these actions correct
the problem.
Defective terminal. Try using a different site
controller communications
port. This requires changing
the communications cable.
Use a C04549 cable if the
terminal is in the LOCAL port.
Use a C05039 cable if the
terminal is in the REMOTE
port. Make sure the
terminal's baud rate matches
the baud rate of the new
communications port If the terminal doesn't work in
either port, replace the
terminal.
Site unable to log messages
(Remote port) Check logger or logger
eliminator. Correct logger problem or try
again.
Defective RS-232 driver or
receiver IC's or defective site
controller CPU PCB. None. Replace the driver IC's in
sockets U5 and U6 and/or the
receiver IC's in sockets U4
and U7. Replace the site
controller CPU PCB if
replacing the IC's didn't fix the
problem.