EPSON Stylus COLOR 680/777/777i Revision B
PRODUCT DESCRIPTION INTERFACE 14
1.3 INTERFACE
The EPSON Stylus COLOR 680/777/777i 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:
n
During data entry (see data transmission timing).
n
When input data buffer is full.
n
During -INIT signal is at low level or during hardware initialization.
n
During printer error (see -ERROR signal).
n
When the parallel interface is not selected.
ERROR signal is at low level when the printer is in one of the following states:
n
Printer hardware error (fatal error)
n
Paper-out error
n
Paper-jam error
n
Ink-out error
PE signal is at high level during paper-out error.
Figure 1-3. 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 -
DATA
data byte n
data byte n+1
-STROBE
BUSY
-ACKNLG
thold
tsetup
tstb
tready
tbusy
treply
tack
tnbusy
tnext
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