Epson Stylus Pro 7000 Series, Руководство по обслуживанию, Страница: 23 / 231

EPSON Stylus Pro 7000 Revision B
Product Description Interfaces 23
1.2.1 Parallel Interface - Compatibility Mode
The BUSY signal is set high before setting the -ERROR signal low or the PE
signal high. The BUSY signal remains high until all these signals return to
their normal, inactive state.
The BUSY signal is high:
„
When receiving data
„
When the input data buffer is full
„
When the -INIT signal is low, or during hardware initialization
„
During a printer error
„
When the parallel interface is not selected
The ERROR signal is low when there is a:
„
Printer hardware error (fatal error)
„
Paper-out error
„
Paper-jam error
„
Ink-out error
NOTE: The PE signal is high during paper-out errors.
DATA TRANSMISSION TIMING
Figure 1-3. Data Transmission Timing
Table 1-13. Parallel Interface Specifications
Item Description
Transmission mode 8-bit parallel, IEEE-1284 compatibility mode
Synchronization By STROBE pulse
Handshaking By BUSY and ACKNLG signal
Logic Level
TTL compatible level (IEEE-1284 Level 1 device)
Connector
57-30360 (Amphenol) or equivalent
Note: Use a twisted-pair cable that is as short as possible.
DATA data byte n data byte n + 1
-STROBE
BUSY
-ACKNLG
t
hold
t
setup
t
stb
t
ready
t
busy
t
reply
t
ack
t
nbusy
t
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