Hardware reference guide

Modbus Plus NOMs
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35013379 11/2011
Modbus Connector Pinouts
The NOM modules are equipped with a nine-pin RS-232C connector that supports
Modicon’s proprietary Modbus communication protocol. The following figure shows
the Modbus port pinout connections for 9-pin (left) and 25-pin (right) connections.
Stop Bits 1 / 2
Parity Enable/Disable Odd/Even
Device Address Rear panel rotary switch setting
Valid Comm Port Parameters