Interface; Hardware Interface; Parallel Interface - Epson Stylus COLOR 670 Service Manual

EPSON Stylus Color 670

1.3 Interface

1.3.1 Hardware interface

This printer provides USB and parallel interface as standard.

1.3.1.1 Parallel interface

o
Transmission mode: 8-bit parallel, IEEE-1284 compatibility
mode
o
Synchronization mode: By STROBE pulse
o
Handshaking: By BUSY and ACKNLG signal
o
Signal level: TTL compatible level
o
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 Figure 1-3, "Data Transmission Timing Chart")
-When input data buffer is full.
-When -INIT signal is at low level or during hardware initialization
-During printer error (see the ERROR signal explanation below)
-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
The figure below shows the timing chart of the parallel interface.
Figure 1-3. Data Transmission Timing Chart
On the above timing chart, T
Table 1-3. t
Parallel I/F Mode
High speed (default)
Normal speed
Interface
n
rated period is shown below.
act
Rated Period
act
T Rated Period
act
1 s
3 s
Revision A
n+1
15