Epson EPL-N1200 User Manual - Page 121
Handshaking, Error handling, Pin assignments
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Note: When using the serial interface as RS-232C, the availability of baud rates over 38400 depends on your computer's hardware reliability (including the interface cable). When using the serial interface as current loop, the availability of baud rates over 2400 depends on your computer's hardware reliability (including the interface cable). EPSON does not recommend or guarantee the use of any particular brand of computer. Handshaking The printer's serial interface can use DTR (Data Terminal Ready) signal levels and XON/XOFF communication protocols either separately or in combination. When the vacant area for data in the input buffer drops to 256 bytes, the printer outputs an XOFF code or sets the DTR signal level to low (MARK), indicating that it cannot receive more data. Once the vacant area for data in the buffer recovers to 512 bytes, the printer outputs the XON code or sets the DTR flag to high (SPACE), indicating that it is again ready to receive data. Error handling An asterisk (*) is printed if a parity error, framing error, or overrun error is detected. Pin assignments The serial interface connector pin assignments and interface signals are described in the table below. The column heading "Direction" refers to the direction of signal flow as viewed from the printer. Signal pin 2 3 5 RS-232C TXD RXD CTS Current loop - Direction OUT - IN - IN Description Transmits data. This pin transmits serial data from the printer to the computer. Received data. This pin transmits data from the computer to the printer. Always ignored A-8 Specifications