RS-232 wires

all wires active low"0" = -12v, "1" = 12v

special driver chips that generate ±12v from 5v

• TxD – transmit data

• TxC – transmit clock

• RTS – request to send: Handshake

• CTS – clear to send : Handshake

• RxD – receive data

• RxC – receive clock

• DSR – data set ready: Handshake

• DTR – data terminal ready: Handshake

• Ground

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