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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 RS-232C
Current
loop Direction Description
2 TXD — OUT Transmits data. This pin
transmits serial data from
the printer to the
computer.
3 RXD — IN Received data. This pin
transmits data from the
computer to the printer.
5 CTS — IN Always ignored
A-8
Specifications