RS232c - Functional specs (9 typically used pins)

5: Clear to Send: (DCE to DTE)

• tells DTE that it can accept data (usually for half duplex)
2: Transmit (DTE to DCE)

• sends data to DCE for it to transmit
3: Receive (DCE to DTE)

• sends received data to DTE
1: Protective Ground (for safety)
7: Common Return (reference voltage for detecting signal levels)

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