Houston Instrument DMP-160 Series Plotters
  (DMP-161, DMP-162, and DMP-162R)
RS-232C Serial Interface Connector on Plotter
Pin # Signal Description
1 GND Chassis Ground
2 TXD Transmit Data
3 RXD Receive Data
4 RTS Request to Send
5 CTS Clear to Send
6 NC Not Connected
7 GND Signal Ground
8-19 NC Not Connected
20 DTR Data Terminal Ready
21-25 NC Not Connected

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