Epson Stylus Color C70, Service Manual

Page: 15 / 216

EPSON Stylus COLOR C70/C80 Revision A
PRODUCT DESCRIPTION INTERFACE 15
1.3 INTERFACE
The EPSON Stylus COLOR C70 / C80 provide USB and parallel interface as standard.
1.3.1 Parallel Interface
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
„
Maintenance request
„
Double feed
PE signal is at high level during paper-out error.
Figure 1-3. Data Transmission Timing
NOTE: (*1) Rise and fall time of every output signal.
NOTE: (*2) Rise and fall time of every input signal.
Table 1-5. Parameter
Parameter Minimum Maximum
tsetup 500ns -
thold 500ns -
tstb 500ns -
tready 0 -
tbusy - 500ns
tt-out
(
*
1)
- 120ns
tt-in ( * 2) - 200ns
treply 0 -
tack 500ns 10us
tnbusy 0 -
tnext 0 -
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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