Gasboy CFN Series Diagnostic Manual - Manual (Page 106)

GASBOY CFN Series
3-42 03/19/04
No console loop communications. All devices on console loop are down.
Possible Cause Checks Corrective Action
Site Controller is down. Check logger or do a PRint
DIagnostics command for
indication that the site is not
running. Do a RUN command if site is
down.
RS-485 phone cable is loose
or not installed correctly. Check that one end of the
cable is installed in the
CONSOLE LOOP connector
on the rear of the site
controller and the other end is
installed in the SITE
CONTROLLER connector on
the rear of the console, or into
the console junction box or
RS232-RS485 converter (if
used). Install cable properly, if it is
incorrect
Incorrect wiring between
junction boxes (used only
when console is located more
than eight feet from site
controller). Verify all field wiring with the
SC II Installation Manual
(C01918). Make wiring connections, if
needed.
Defective RS-485 receiver IC
and Protected Driver Board. To isolate driver problem, try
swapping cables: move loop 2
cable to loop 1 and vice
versa. Replace U5 on the SC II CPU
Board. When replacing U5,
replace the entire Protected
Driver Board (C05848), not
just the driver IC.
Defective CPU board or
console CPU board. None. Replace the SC II CPU board
or console CPU board.
Defective RS-485 junction
board (if used). None. Replace the RS-485 junction
board
Console CPU not configured
correctly. Check console #7 set up. Correct, if necessary.
Bad RS-485 cable. None. Replace bad cable.