A.    For serial port connections, this plotter uses a straight-through 9-pin
      to 9-pin serial cable (CalComp part #22129-0109 10 ft. serial cable, or
      part #22129-0257 25 ft. serial cable).
      
      1.    The serial port on a PC is either a 9-pin or 25-pin male port
            (pins sticking out). Connecting a 9-to-25-pin adapter (available
            at a local computer supply store) is acceptable, either at the
            computer-end or at the plotter-end.
      
      2.    The serial cable must be no longer than 50 feet.
      
      3.    Verify that the settings on the plotter match the software
            driver:
            
            a.    Baud rate, number of bits, parity, stop bits=1, handshake
                  (use hardware or CTS if possible).
            
            b.    If using 907/PCI protocol, then verify sync char, # sync
                  chars, checksum, and end of buffer character.
            
            c.    Refer to the User's Guide  for a list of settings for
                  several applications.
      
      4.    It is possible that the port on their computer is not working.
            Additionally,  a PC with an internal fax/modem installed might
            have that port disabled.
            
            a.    Try connecting to a different port.
            
            b.    Try connecting to a different computer.
            
            c.    Try using a different serial cable.

B.    For parallel port connections, this plotter uses a standard Centronics
      parallel cable (CalComp part #18735-0129 10 ft. parallel cable).  The
      cable length maximum is 12 feet, unless it is a good quality double
      shielded cable. The 25-foot CalComp twisted-pair, double-shielded
      cables are the only longer Centronics parallel cables supported by
      CalComp (CalComp part #717960-9 25 ft. parallel cable).
      
      1.    Verify that the settings on the plotter match the software
            driver:
            
            a.    If using 907/PCI protocol, then verify sync char, # sync
                  chars, checksum, and end of buffer character.
            
            b.    Refer to the User's Guide  for a list of settings for
                  several applications.
      
      2.    It is possible that the port on their computer is not working.
            
            a.    Try connecting to a different port, if available.
            
            b.    Try connecting to a different computer.
            
            c.    Try using a different Centronics parallel cable.