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Drawing 6: Wiring from controller to AI devices
ACCESS
INTERFACE
POWER &
USB
ETHERNET
(AI) DEVICES
BATTERY
RS232C
CONTROLLER
INSULATED SHIELD WIRE
4-CONDUCTOR, 18GA,
SHIELDED CABLE
TO ALL
DEVICES
Keep splices to a minimum. RS485 splices should be made using 3M U-Type connectors
and crimpers only.
During retrofits and change-outs, use new wire for installations and updates. Do not use
existing wire that has already been pulled on a site, it is impossible to know the condition of
this wire and the system may not perform as required.
Do not use RS485 for more than 4,000 feet in a single run. RS485 should be run in series
from the controller to the first AI device, then from the first AI device to the second, etc.
Avoid star patterns in the wiring, where an individual cable is run to each AI device, as this
makes future service and troubleshooting almost impossible.
114A3866.D Revised 7-2017
23
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