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Code
The hexadecimal numbers corresponding to the XON/XOFF codes are shown below.
XON code: 11H
XOFF code: 13H
IEEE 1284 Parallel Interface
Modes
The IEEE 1284 parallel interface supports the following two modes.
Compatibility Mode
Compatibility mode allows data transmission from host to printer only: Centronics-compatible.
Specification
Signal Printer status
DIP switch 2-1
1 (ON) 0 (OFF)
XON 1) When the printer goes online after turning on the power (or reset using
the interface)
Transmit Transmit
2) When the receive buffer is released from the buffer full state Transmit Transmit
3) When the printer switches from offline to online — Transmit
4) When the printer recovers from an error using some ESC/POS
commands
— Transmit
XOFF 5) When the receive buffer becomes full Transmit Transmit
6) When the printer switches from online to offline — Transmit
CAUTION
When the printer goes from offline to online and the receive buffer is full, XON is not
transmitted.
When the printer goes from online to offline and the receive buffer is full, XOFF is not
transmitted.
When DIP switch 1-3 is off, XON is not transmitted as long as the printer is offline, even if a
receive buffer full state has been cleared.
Mode Communication direction Other information
Compatibility mode Host Printer communication Centronics-compliant
Reverse mode Printer Host communication Assumes a data transfer from an asynchronous
printer
Data transmission 8-bit parallel
Synchronization Externally supplied STROBE
signals
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