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EPSON Stylus PHOTO 810/820/830 Revision B
PRODUCT DESCRIPTION INTERFACE 17
1.3 INTERFACE
The EPSON Stylus PHOTO 810/820/830 provides 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
No ink-cartridge
Maintenance request
PE signal is at high level during paper-out error.
Figure 1-8. Data transmission timing
* Rise and fall time of every output signals
** Rise and fall time of every input signals
*** Typical timing of tack is shown on the following page.
Table 1-10. Data transmission timing
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
t
hold
t
setup
t
stb
t
ready
t
busy
t
reply
t
ack
t
nbusy
t
next