Communications wiring
Unit Ventilator
CARRIER CORPORATION ©2019
Integration Guide
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13
Jumper set to EIA-485
Proper connection wiring
Unique rotary address switches 1 – 99. If controllers have duplicate addresses, network communication can
be lost.
NOTES
If RX LED is solid, then the terminations are incorrect.
If the network has greater than 32 devices or exceeds 2,000 feet, a Repeater should be installed.
If a controller begins or ends a network segment, a terminating resistor may be needed.
The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.
Modbus Exception Codes that might be returned from this controller
Codes
Name
Description
01
Illegal Function
The Modbus function code used in the query is not
supported by the controller.
02
Illegal Data
Address
The register address used in the query is not supported
by the controller.
04
Slave Device
Failure
The Modbus Master has attempted to write to a non-
existent register or a read-only register in the
controller.
LonWorks
WARNING
When you handle the LonWorks Option Card:
Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.
Do not touch components or leads.
Handle the board by its edges.
Isolate from high voltage or electrostatic discharge.
Ensure that you are properly grounded.
