Hardware reference guide

Modbus Plus NOMs
266
35013379 11/2011
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.
The following table shows the address settings for the SW1 and SW2 switches.
Front Panel Switches
Two, three-position slide switches are located on the front of the unit. The three-
position slide switch on the right is used to select the comm parameter settings for
the Modbus (RS-232) port provided with the Modbus Plus option module. Three
options are available, as shown in the following illustration.
NOTE: If the left-hand switch is in the upper position and right-hand switch is set to
mem then, as of firmware version 2.20, bridge mode is deactivated. This means that
the network connection between Modbus and Modbus Plus is locked.
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