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Appendix C
The Serial Interface
This appendix has the information you need to use the EX's built-in
serial interface. It includes DIP switch settings, problem solving, and
technical specifications. The information on the built-in parallel
interface is in Chapter 1 and Appendix G, and the information on
optional interfaces is in Appendix E
WARNING
Two interface cables should not be plugged into the printer at the same
time. This may damage your printer.
The most important thing to keep in mind about using a serial
interface is that the serial settings on the printer, computer, and software
must all be the same for your EX to print properly Therefore, when
you change the setting on one, you must be sure that it matches the
settings on the others.
The DIP Switches
After you have connected your computer to the built-in serial
interface of the EX, the first thing you need to do is change or check the
settings of several DIP switches. Four of the 16 DIP switches on the EX
control the built-in serial interface.
Serial communication has four characteristics. Two of these cannot be
changed in the EX serial interface and must be set on the computer and
software. The number of start bits is fixed at one, and the computer
must match this setting. The number of stop bits can be one or more-
you should normally choose one.
The remaining two characteristics can be set on the printer. They are
baud rate and parity
The baud rate (which is the speed that data can be received by the
printer) is set for 9600 at the factory Do not change that setting unless
your computer or software manuals suggest another setting or unless
your printing is not reliable at that setting. Always remember to set the
same speed on the computer and the printer
The Serial Interface
C-1