72
Pin Assignment Chart:
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 For remote switch
Pin 13:  +5 V
Pin 14:  Internal ground (GND)
Pin 15:  Universal remote 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