Installing the RTU Open
RTU Open v3 CARRIER CORPORATION ©2019
Installation and Start-up Guide All rights reserved
11
To set the controller's address
The RTU Open's two rotary switches determine the RTU Open's MAC address when it is placed on an MS/TP
network. The rotary switches define the MAC address portion of the RTU Open's BACnet device instance number,
which is composed of the MS/TP network number and the MAC address. They also set the slave address on a
Modbus or N2 network when less than 100. See the RTU Open Integration Guide for additional information on
integration.
1 Turn
the RTU Open's power. The controller reads the address each time you apply power to it.
2 Using the rotary switches, set the
(
) switch to the tens digit of the address, and set the
(
) switch to the ones digit.
To set the RTU Open’s address to 01, point the arrow on the
(
) switch to 0 and the arrow
on the
(
) switch to 1.
10's
1's
1
3
4
5
2
7
8
9
6
0
1
3
4
5
2
7
8
9
6
0
SW1
SW2
MSB
LSB
3 Turn on the RTU Open's power.
The factory default setting is
and must be changed to successfully install your RTU Open. The
MAC address of the controller must be unique on its network.
To set the controller's communications protocol and baud rate
RTU Open's
DIP switches are used to set the controller's protocol and baud rate. The protocol and speed
selection is determined by the network on which the controller will be installed. For Carrier BACnet
implementations, select MS/TP @ 76.8 k as follows:
1 Power down the RTU Open. The controller reads the protocol and baud rate each time you apply power to it.
2 Set
DIP switches 1, 2, and 4 to
to configure the controller for BACnet MS/TP and 76.8 k baud.
3 Power up the RTU Open.
Other protocols and baud rates are available. See the RTU Open Integration Guide for additional
instructions.
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