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If you plan to use the serial port Debug Server "SERSERV", a cable must
connect the serial ports of the two computer systems.  The following diagram
illustrates the wiring between the two serial ports.  If your computer
systems have more than one serial port, any serial port may be used.


         Task Machine          Debugger Machine
           Serial                  Serial
          Connector               Connector

          Pin #              Pin #
              1 (PG) <---------->1 (PG)

              2 (TxD)<---------->3 (RxD)

              3 (RxD)<---------->2 (TxD)

      ------- 4 (RTS)            4 (RTS) -------
     |                                          |
      ------> 5 (CTS)            5 (CTS) <------

      ------> 6 (DSR)            6 (DSR) <------
     |                                          |
     |        7 (SG) <---------->7 (SG)         |
     |                                          |
     |------> 8 (DCD)            8 (DCD) <------|
     |                                          |
      ------ 20 (DTR)           20 (DTR) -------

Figure 25. Serial Port Wiring Scheme

Note that the wiring is symmetrical (i.e., either end of the cable can be
plugged into either PC).  This particular arrangement of the wiring is
sometimes called a "null modem" (since pins 2 and 3 are crossed and no modem
is involved).