The plotter has a RS232 interface that requires a handshake, this has led to some minor problems. Different operating systems have a greater or lessor implementation of handshake/flow control. The connection as shown will work on MS-DOS upto MS Windows-XP. The plotter connector is a DTE configuration so a cross-over is required when connecting to a computer, which will also be a DTE.

PLOTTER                     COMPUTER
    25-pin              9-pin           25-pin
2 RX                     2                3 TX
3 TX                     3                2 RX
20 DTR                   8                5 CTS
                    7 to 6 to 1      4 RTS to 6 DSR to 8 DCD