Hardware reference guide

Modbus Plus NOM
35013379 11/2011 275
Setting the slide switch to the top position assigns ASCII functionality to the port. The
following table shows the ASCII comm port parameters, which are set and cannot
be changed.
Setting the slide switch to the middle position assigns remote terminal unit (RTU)
functionality to the port; the following RTU comm parameters are set and cannot be
changed.
Setting the slide switch to the bottom position gives you the ability to assign comm
parameters to the port in software. The following parameters are valid.
ASCII Comm Port Parameters
Baud 2,400
Parity Even
Data Bits 7
Stop Bits 1
Device Address Rear panel rotary
switch setting
RTU Comm Port Parameters
Baud 9,600
Parity Even
Data Bits 8
Stop Bits 1
Device Address Rear panel rotary
switch setting
Valid Mem Comm 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
Data Bits 7 / 8
Stop Bits 1 / 2
Parity Enable/Disable Odd/Even
Device Address Rear panel rotary switch setting