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Interface Specifications
Baud rate
300, 600, 1200, 2400, 4800, 9600,
19200, 38400 bits
per
second
Signal level
RS-232C: Conforms to EIA
Connector
D-sub 25pin connector
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 128 bytes, the printer outputs an XOFF code
or sets the DTR signal level to low (MARK), indicating it cannot
receive more data.
Once the vacant area for data in the buffer recovers to 256 bytes,
the printer outputs the XON code or sets the DTR flag to high
(SPACE), indicating it is again ready to receive data.
Error handling
A * character is printed if a parity error, framing error, or over run
error is detected.
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.
A-12 Appendix A