Gasboy CFN Series Diagnostic Manual - Manual (Page 362)

Site Controller III
12-28 1116
No Island Loop communications. All devices on Island 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 or RUN;I 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
junction box and the other end
is installed in the loop 1 or 2
connector on the rear of the
Site Controller III. Install cable properly if it is
incorrect.
Incorrect wiring of junction box
or island loop devices. Verify all field wiring with the
SC III Installation Manual
(C35880). Make wiring connections if
needed.
Incorrect jumper setting on
Site Comm CPU Board. Check the K7 (loop 2 default
setting is 2 wire) or K6 (loop 1
default setting is 4 wire)
jumpers. Jumper on pins 2 &
3 for 4 wire, pin 1 & 2 for 2
wire. Correct jumpers if needed.
You should only need 2 wire
for communicating to Tokheim
DPTs. If the loop is not
connected to DPTs, it should
be jumpered for 4 wire.
Defective Site board set. Try switching from loop 1 to 2
or vice versa. Make sure K6
or K7 are set correctly (see
above). If neither loop works, replace
the Site board set.
Defective RS-485 junction
board. None. Replace the RS-485 junction
box.
Defective RS-485 cable. None. Replace defective cable
(C05670).