Half Duplex
The schematic below is used to make a half duplex RS232 monitoring cable.
This cable is used for monitoring 2 devices communicating in half duplex fashion, that is, one device would send data and the other device would receive data. Both devices cannot transmit at the same time with half duplex, if that happened the data would be unusable.
Full Duplex
The next cable is used for monitoring full duplex RS232 communication.
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