Communications wiring
RTU Open v3 Carrier Proprietary and Confidential CARRIER CORPORATION ©2016
Integration Guide All rights reserved
7
BACnet MS/TP
To set up the RTU Open for BACnet MS/TP
Refer to Appendix B (page 46) for the Protocol Implementation Conformance Statement, or download the latest
from BACnet International http://www.bacnetinternational.net/catalog/index.php?m=28.
This controller counts as a full load on the MS/TP bus.
1 Turn
the RTU Open's power.
Changes made to the switches when the controller is on will not take effect until the power is cycled!
2 Using the rotary switches
(
) and
(
), set a unique MS/TP MAC address for the RTU Open.
Set the
(
) switch to the tens digit of the address, and set the
(
) switch to the ones digit.
Valid addresses are 01-99.
The rotary switches also determine the BACnet device instance of the controller on the BACnet
network. The BACnet device instance is automatically generated based on the scheme 16101xx, where “16”
is the BACnet vendor ID for Carrier Corporation, and xx equals the rotary switch address.
To set the controller’s MS/TP MAC address to 01, point the arrow on the
(
) switch to 0
and the arrow on the
(
) switch to 1. Internally, the BACnet device instance is automatically
generated as 1610101.
3 Set the
Comm Selector DIP switches
and
for the appropriate communications speed (9600,
19.2k, 38.4k, or 76.8k bps).
Use the same baud rate and communication settings for all controllers on the network segment. The
RTU Open is fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's communications.
Off Off
On Off
Off On
On On
4 Set
Comm Selector DIP switches
through
for BACnet MS/TP. See table and example below.
5 Leave
and
in the OFF position. These switches are not applicable to MS/TP.
SW3 Protocol Switch Settings for MS/TP
Off Off Off Off On Off
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