Epson LQ-860 - Impact Printer, User Manual

Page: 248 / 325

Interface Specifications
Your printer is equipped with both a parallel and a serial interface.
For specifications on optional interfaces, see the manuals provided
with the interfaces.
Parallel Interface
Pin assignments for the parallel interface
Connector pin assignments and a description of their respective
interface signals are shown in the following table.
Signal
Pin
1
2
3
4
5
6
7
8
9
10
11
Return
Pin
19
20 DATA 1
21 DATA 2
22 DATA 3
23 DATA 4
24 DATA 5
25 DATA 6
26 DATA 7
27 DATA 8
28 ACKNLG
29
BUSY OUT
Signal
STROBE
Direction
IN
IN
IN
IN
IN
IN
IN
IN
IN
OUT
Description
STROBE pulse to read data. Pulse
width must be more than 0.5
microseconds
at the receiving terminal.
These signals represent information of
the 1st to 8th bits of parallel data,
respectively. Each signal is at HIGH
level when data is logical 1 and LOW
when it is logical 0.
About an 11-microsecond pulse. LOW
indicates that
data has been received
and that the printer is ready to accept
more data.
A HIGH signal indicates that the printer
cannot receive data. The signal goes
HIGH in the following cases:
1) During data entry (ea. char. time)
2) During printing
3) When off line
4) During printer-error state
Technical Specifications
8-11