Rev. A Interfaces and Connectors A-3
TM-T88II/T88III Technical Reference Guide
A.1.4 Code
The hexadecimal numbers corresponding to the XON/XOFF codes are shown below.
❏ XON code: 11H
❏ XOFF code: 13H
Note:
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 memory switch MSW 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.
A.2 IEEE 1284 Parallel Interface
A.2.1 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.
Specifications
• Data transmission: 8-bit parallel
• Synchronization: Externally supplied STROBE* signals
• Handshaking: ACK
* and BUSY signals
• Signal levels: TTL-compatible connector
• Connector: ADS-B36BLFDR176 (HONDA) or equivalent product
(IEEE 1284 Type B)
• Reverse communication: Nibble or byte mode
*A rule above a signal name indicates an “L” active signal.
Table A-4 Parallel modes
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
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