Epson C31C636A898 Technical Reference - Page 69
IEEE 1284 Parallel Interface
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TM-T88IV 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 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. A.2 IEEE 1284 Parallel Interface A.2.1 Modes The IEEE 1284 parallel interface supports the following two modes. Table A-4 Parallel modes Mode Communication direction Compatibility mode Host →Printer communication Reverse mode Printer →Host communication Other information Centronics-compliant Assumes a data transfer from an asynchronous printer 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. Rev. A Interfaces and Connectors A-3