Modbus; To Set Up The Unit Vent For Modbus Rtu - United Technologies Carrier Unit Vent Open Integration Manual


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

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.

Refer to Appendix A for the Network Points list.

Refer to Appendix D for the Protocol Implementation Conformance Statement.
Software settings defined through the Equipment Touch device. To confirm settings, obtain a Modstat of the
device. On the Equipment Touch, click the link to the Modstat.

Modbus

To set up the Unit Vent for Modbus RTU

Turn off the power for the Unit Vent by disconnecting power terminals.
1
Using the rotary switches, set a unique address. Set the Tens (10's) switch to the tens digit of the address,
2
and set the Ones (1's) switch to the ones digit.
EXAMPLE If the controller's address is 25, point the arrow on the Tens (10's) switch to 2 and the arrow on
the Ones (1's) switch to 5.
0
10's
0
1's
NOTE The Unit Vent recognizes its address only after power has been cycled.
Set communications selector for EIA-485.
3
Unit Ventilator
Integration Guide
11
Communications wiring
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