Troubleshooting Arc156 Communication - Carrier RTU Open v5 Integration Manual

Communications wiring
The following example shows the DIP switches set for BACnet ARC156.
Connect the BACnet ARC156 network to the controller's J19 Network Comm port. Connect to Net+, Net-, and
4
SHLD.
Wire specifications
A dedicated 22 AWG shielded twisted pair wire (EIA 485)
○
Maximum wire length 2000 feet (610 meters) or 32 nodes
○
Devices should be daisy-chained and not star-wired
○
Attach the drain/shield wire to both ends of the network segment and through every controller
○
NOTE Use the same polarity throughout the network segment.
Turn on the RTU Open's power.
5

Troubleshooting ARC156 communication

The most common communication problems result from not properly following the configuration steps outlined
above in this manual. Review all of the steps and use the following list to check your settings.
Verify accuracy of the following:

Protocol DIP switches DS3 - DS6

Proper connection wiring

Unique rotary address switches 1 – 99. If controllers have duplicate addresses, network communication can
be lost.

Unique BACnet Device Instance numbers. Default is 16101XX, with the rotary address switches defining XX. If
controllers have duplicate device instance numbers, network communication can be lost.
NOTES

The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.

If RX LED is solid, then the terminations are incorrect.
RTU Open v5
Integration Guide
10
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