Epson DFX-8500 User Manual - Page 213
Parallel Interface Specifications, Forward channel, Reverse channel
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Parallel Interface Specifications The printer comes with a bidirectional, 8-bit, parallel interface and a Type-B optional interface slot. Forward channel Transmission mode: Adaptable connector: Synchronization: Handshaking: Signal level: 8-bit parallel, IEEE-1284 compatibility mode 57-30360 (Amphenol) or equivalent STROBE pulse BUSY and ACKNLG signals TTL compatible (IEEE-1284 level 1 device) Reverse channel Transmission mode: Adaptable connector: Synchronization: Handshaking: Signal level: Data transmission timing: Extensibility request: 00H: 04H: IEEE-1284 nibble mode 57-30360 (Amphenol) or equivalent Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification IEEE-1284 level 1 device Refer to the IEEE-1284 specification The printer responds to the extensibility request in the affirmative when the request is 00H or 04H, which means: Request nibble mode of reverse channel transfer Request device ID in nibble mode of reverse channel transfer A-16 Specifications