Quantum CPUs are equipped with a nine-pin RS-232C connector that supports Schneider Electric’s proprietary Modbus communication protocol. The following is the Modbus port pinout connections for nine-pin and 25-pin connections.
Modbus Port 1 has full modem interfacing capabilities Modbus Port 2 RTS/CTS connections function properly for normal non-modem communications but do not support modems.
NOTE: Although the Modbus ports electrically support existing Modbus cables, it is recommended that a Modbus programming cable (Part # 990 NAA 263 20 or 990 NAA 263 50) be used. This cable has been designed to fit under the door of a Quantum CPU or NOM module.
Modbus Ports Pinout Connections Figure
The following figure shows the Modbus port pinout connections for nine-pin and 25-pin connections.
The following is the abbreviation key for the above figure.
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TX: Transmitted Data
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DTR: Data Terminal Ready
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RX: Received Data
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CTS: Clear to Send
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RTS: Request to Send
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NC: No Connection
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DSR: Data Set Ready
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CD: Carrier Detect
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Modbus Ports Pinout Connections for Portable Computers
The following figure shows the Modbus port pinout connections for 9-pin portable computers.
