Interface; Parallel Interface (Forward Channel) - Epson Stylus COLOR 880 Service Manual

EPSON Stylus COLOR 880

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.
PRODUCT DESCRIPTION
D A T A
-S T R O B E
t
setup
B U S Y
t
ready
-A C K N L G
Figure 1-2. Data Transmission Timing
Parameter
tsetup
thold
tstb
tready
tbusy
tt-out*
tt-in**
treply
tack
tnbusy
tnext
* 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.
INTERFACE
data byte n
data byte n+1
t
hold
t
next
t
stb
t
busy
t t t
reply ack nbusy
Table 1-3.
Minimum Maximum
500ns
500ns
500ns
0
- 500ns
- 120ns
- 200ns
0
500ns 10us
0
0
Revision A
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