Epson 4100 manual Connection Examples, IBM PC to Printer

Operator's Guide B-11

CONNECTION EXAMPLES

Use the following examples as guides in building a serial interface cable. The following examples are presented:

•IBM PC to Printer

•IBM PC/AT to Printer

IBM PC TO PRINTER

The wiring diagram on the following page shows how to connect an IBM PC, a DTE device, to the printer, also a DTE device. A DTE/DTE interface must make each side of the link seem as if it is receiving inputs from a DCE device. This is accomplished by making a cross-connected cable.

First, the Signal Ground on the printer is tied to the Signal Ground on the IBM PC; likewise, the Frame Grounds on the printer and IBM PC are tied together. Next, RxD on the printer (Pin 3) is tied to TxD (Pin 2) on the IBM PC; then TxD (Pin 2) on the printer is tied to RxD (Pin 3) on the IBM PC. Lastly, the control signals are connected: DTR (Pin 20) on the printer to DSR (Pin 6) on the IBM PC, and RTS (Pin 4) on the printer to CTS (Pin 5) on the IBM PC.

When the printer powers up, it always raises the voltage on its Pin 20, DTR, and maintains it in an elevated state. The PC receives this signal on Pin 6, DSR, and interprets it to mean that the printer is available.