Epson LQ 670 User Manual - Page 153

Parallel Interface Specifications, Forward channel, Reverse channel

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Pa rallel Interfa ce Specifications The p rinter com es w ith a bidirectional, 8-bit, parallel interface and an op tional interface slot. Forwa rd cha nnel Transmission mode: Ad ap table connector: Sy n ch r o n iz a tio n : H an d sh a kin g : Signal level: 8-bit parallel, IEEE-1284 com patibility mode 57-30360 (Am phenol) or equivalent STROBE pulse BUSY and ACKN LG signals TTL com patible (IEEE-1284 level 1 d evice) Reverse cha nnel Transm ission m ode: Ad ap table connector: Sy n ch r o n iz a tio n : H an d sh a kin g: Signal level: Data transmission tim ing: Extensibility requ est: IEEE-1284 N ibble Mod e 57-30360 (Am phenol) or equivalent Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification IEEE-1284 Level 1 device 00H : 04H : Refer to the IEEE-1284 specification The printer respond s to the extensibility request in the affirm ative w hen the request is 00H or 04H , w hich m eans: Request nibble m od e of reverse channel t r a n s fer Requ est d evice ID in nibble m od e of reverse channel transfer A-12 Specifications

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Parallel Interface Specifications
The printer comes with a bidirectional, 8-bit, parallel interface and an
optional interface slot.
Forward channel
Transmission mode:
8-bit parallel, IEEE-1284 compatibility
mode
Adaptable connector:
57-30360 (Amphenol) or equivalent
Synchronization:
STROBE pulse
Handshaking:
BUSY and
ACKNLG signals
Signal level:
TTL compatible (IEEE-1284 level 1 device)
Reverse channel
Transmission mode:
IEEE-1284 Nibble Mode
Adaptable connector:
57-30360 (Amphenol) or equivalent
Synchronization:
Refer to the IEEE-1284 specification
Handshaking:
Refer to the IEEE-1284 specification
Signal level:
IEEE-1284 Level 1 device
Data transmission
timing:
Refer to the IEEE-1284 specification
Extensibility request:
The printer responds to the extensibility
request in the affirmative when the
request is 00H or 04H, which means:
00H:
Request nibble mode of reverse channel
transfer
04H:
Request device ID in nibble mode of
reverse channel transfer
A-12
Specifications