Epson 4100 manual

B-10 Appendix B—Serial Interface

To determine the pin assignments of other devices, refer to those devices' technical reference manuals. The serial interface pin assignments, functional description, signal direction, and control requirements are usually described.

If no documentation is available, a "break-out box" or an intelligent serial interface cable can determine which pins are used. (I.Q. Technology's Smart Cable, for example, is an intelligent serial interface cable.)

As pin assignments are determined, pin numbers should be written down on the appropriate wiring diagram on Page B-10. When you have written down all required pin assignments, you can then build the cable directly from the wiring chart.

Keep in mind that the actual pin number assigned to any signal may vary from device to device. For example, Pin 5 is the pin assigned to Signal Ground on the IBM PC/AT (or later) while Pin 7 is the pin assigned to Signal Ground on the IBM PC.