Epson EPL-7500 User Manual - Page 189
Serial interface pin assignments, signals is given relative to the printer.
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Serial interface pin assignments The serial interface connector pin assignments and a description of the interface signals are shown in the table below. The direction of signals is given relative to the printer. Signal Pin RS-232C RS-422 Direction Description 1 CHASSIS CHASSIS - GND GND Printer's chassis ground, which is connected with the logic ground. 2 TXD (SYNC) OUT Transmits data. This pin transmits serial (Ignored) data from the printer to the computer. 3 RXD (TXD-) IN Received data. This pin transmits serial (OUT) data from the computer to the printer. 4 RTS (GND) OUT Request to send This pin IS held HIGH (-) by the printer. 5 CTS (RXD-) ignored Clear to send. This pin indicates that (IN) the computer is ready to receive data from the printer. The printer will not proceed unless the signal is HIGH. Can be set HIGH with SelecType. 6 DSR (TXD+) IN Data set ready. This pin indicates that (OUT) the computer IS ready to receive data from the printer. Can be set HIGH with SelecType. 7 SG Signal ground This pin provides a ground for all the signal lines. 8 DCD (RXD+) IN Data carrier detect. Always ignored. (IN) Technical Specifications 8-15