Hardware reference guide

Modbus Plus NOM
35013379 02 October 2007 297
Rear Panel
Switches
Two rotary switches are located on the rear panel of the modules. They are used
together to set the Modbus Plus node and Modbus port address for the unit.
Rotary SW1 (top switch) sets the upper digit (tens), and rotary SW2 (bottom switch)
sets the lower digit (ones) of the Modbus Plus node address. The following
illustration shows the setting for an example address of 11.
The following figure shows the node address settings for the SW1 and SW2 switches.
Note: The highest address that may be set with these switches is 64.
SW1 and SW2 Address Settings
Node Address SW1 SW2
1 ... 9 0 1 ... 9
10 ... 19 1 0 ... 9
20 ... 29 2 0 ... 9
30 ... 39 3 0 ... 9
40 ... 49 4 0 ... 9
50 ... 59 5 0 ... 9
60 ... 64 6 1 ... 4
Note: If "0" or an address greater than 64 is selected, the Modbus + LED will be
"on" steady, to indicate the selection of an invalid address.
1
3
0
9
2
6
4
5
8
7
1
3
0
9
2
6
4
5
8
7
SW1 (Tens)
SW2 (Ones)
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com