Hardware reference guide

Modbus Plus NOMs
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Modbus Ports Pinout Connections for Portable Computers
The following figure shows the Modbus port pinout connections for nine-pin portable
(laptop) computers.
The following is the abbreviation key for the above figures.
TX: Transmitted Data DTR: Data Terminal Ready
RX: Received Data CTS: Clear to Send
RTS: Request to Send NC: No Connection
DSR: Data Set Ready CD: Carrier Detect