RS-232, serial port used in machine to machine communication
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Serial port / serial interface. The most frequently used connector is CANON DB9 (Male / Female). Basic bi-directional serial communication uses 3 wires (RxD, TxD, GND). The full RS-232 serial port has 9 wires. The interface was originally intended for connecting a modem. Other connectors, such as CANON DB25, RJ45, are sometimes used.

Maximum cable length is about 15 to 30 meters.

NETIO 4C provides a 3-wire serial port at its green terminal block.


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