Epson Stylus Color 880, Руководство по обслуживанию

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EPSON Stylus COLOR 880 Revision A
PRODUCT DESCRIPTION INTERFACE 15
1.3 INTERFACE
The EPSON Stylus COLOR 880 provide USB and parallel interface as
standard.
1.3.1 Parallel Interface (Forward Channel)
Transmission Mode: 8 bit parallel, IEEE-1284 compatibility mode
Synchronization: By STROBE pulse
Handshaking: BY BUSY and ACKNLG signal
Signal Level: TTL compatible level
Adaptable Connector: 57-30360 (amphenol) or equivalent
BUSY signal is set high before setting either -ERROR low or PE high, and held
high until all these signals return to their inactive state.
BUSY signal is at high level in the following cases:
„
During data entry (see data transmission timing).
„
When input data buffer is full.
„
During -INIT signal is at low level or during hardware initialization.
„
During printer error (see -ERROR signal).
„
When the parallel interface is not selected.
ERROR signal is at low level when the printer is in one of the following states:
„
Printer hardware error (fatal error)
„
Paper-out error
„
Paper-jam error
„
Ink-out error
PE signal is at high level during paper-out error.
Figure 1-2. Data Transmission Timing
* Rise and fall time of every output signal.
** Rise and fall time of every input signal.
*** Typical timing for tack is shown on the following page.
Table 1-3.
Parameter Minimum Maximum
tsetup 500ns -
thold 500ns -
tstb 500ns -
tready 0 -
tbusy - 500ns
tt-out* - 120ns
tt-in** - 200ns
treply 0 -
tack 500ns 10us
tnbusy 0 -
tnext 0 -
D A T A data byte n data byte n+1
-S T R O B E
B U S Y
-A C K N L G
t
hold
t
setup
t
stb
t
ready
t
busy
t
reply
t
ack
t
nbusy
t
next