Ieee 1284 Parallel Interface; Compatibility Mode - Epson TM-T88VI Technical Reference Manual

Signal
XON 1) When the printer goes online after turning on the power (or reset using
the interface)
2) When the receive buffer is released from the buffer full state
3) When the printer switches from offline to online
4) When the printer recovers from an error using some ESC/POS
commands
XOFF 5) When the receive buffer becomes full
6) When the printer switches from online to offline
Code
The hexadecimal numbers corresponding to the XON/XOFF codes are shown below.
 XON code: 11H
 XOFF code: 13H
CAUTION

IEEE 1284 Parallel Interface

Modes
The IEEE 1284 parallel interface supports the following two modes.
Mode

Compatibility mode

Reverse mode
Compatibility Mode
Compatibility mode allows data transmission from host to printer only: Centronics-compatible.
Specification
Data transmission
Synchronization
130
Printer status
 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.
Communication direction
Host  Printer communication
Printer  Host communication
8-bit parallel
Externally supplied STROBE signals
DIP switch 2-1
1 (ON)
Transmit
Transmit
—
—
Transmit
—
Other information
Centronics-compliant
Assumes a data transfer from an asynchronous
printer
0 (OFF)
Transmit
Transmit
Transmit
Transmit
Transmit
Transmit