
Chapter 4: Communications Parameters 31
There are two dipswitches located on the DCU. Dipswitch 1 selects the baud rate and internal
functions. Switches 1 and 2 of dipswitch 1 select the baud rate. Switches 3 through 8 select the
internal functions of dipswitch 1. See the following tables for the recommended settings.
Baud Rate Settings for Dipswitch 1
Baud Rate Switch 1 Switch 2
300 Off Off
1200 On Off
9600 Off On
19200 On On
Internal Function Settings for Dipswitch 1
Switch Function Setting
3 Parity Odd or None
4 Self-Diagnostic Operate
5 Turn-Around Delay No Delay
6 Mode at Power Up PGM or Run
7 Not Used
8 Transmission Mode HEX
Dipswitch 2 sets the slave address of the PLC. This must match the PLC ID in the PLC Name and
Port Parameters Table. The station number can be any number from 1 to 90. The switches are set in
binary with switch 1 representing the least significant bit. See the figure below for an example of
dipswitch 2 with the station number set to 9.
Dipswitch 2
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