Pin Assignment:
Pin 1: Shield
Pin 2: Data Output (TxD)
Pin 3: Data Input (RxD)
Pin 4: Not Connected
Pin 5: Clear to Send (CTS)
Pin 6: Internally Connected
Pin 7: Internal Ground (GND)
Pin 8: Internal Ground (GND)
Pin 9: Not Connected
Pin 10: Not Connected
Pin 11: +12 V
Pin 12: +5 V Connection for a switch
Pin 13: +5 V
Pin 14: Internal Ground (GND)
Pin 15: Universal Switch
Pin 16: <
Pin 17: =
Pin 18: >
Pin 19: SET
Pin 20: Data Terminal Ready (DTR)
Pin 21: Not Connected
Pin 22: Not Connected
Pin 23: Not Connected
Pin 24: Not Connected
Pin 25: +5 V
4–20
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