Hardware reference guide

CPU Modules
130
35013379 11/2011
Setting the slide switch to the bottom position gives you the ability to assign
communication parameters to the port in software; the following parameters are
valid.
Rear Panel Switches
Two rotary switches (refer to the illustration and table that follow) are located on the
rear panel of the CPU. They are used for setting the Modbus Plus node and Modbus
port addresses.
NOTE: The highest address that may be set with these switches is 64.
SW1 (the top switch) sets the upper digit (tens) of the address; SW2 (the bottom
switch) sets the lower digit (ones) of the address. The illustration below shows the
correct setting for an example address of 11.
The following figure shows SW1 and SW2 switches.
Valid Communication Port Parameters
Baud 19,200 1,200
9,600 600
7,200 300
4,800 150
3,600 134.5
2,400 110
2,000 75
1,800 50
Parity Enable/Disable Odd/Even
Data Bits 7 / 8
Stop Bits 1 / 2
Device Address 1 ... 247