The Parallel And Serial Interfaces; Pins And Signals - Epson LQ-800 User Manual

The Parallel and Serial Interfaces

The LQ-800/1000 printers have both parallel and serial interfaces to
communicate with the computer; this appendix describes these inter-
faces.
Parallel Interface
Connector pin assignments and a description of respective interface
signals are shown in Table F-1.
Signal Return
Pin
Pin
1 19
2
20
3 21
2 2
4
23
5
24
6
7 25
8
26
2 7
9
10
28
11
29
Appendix F
Table F-1. Pins and signals
Direc-
Signal tion
STROBE IN
DATA 1 IN
DATA 2 IN
DATA 3
DATA 4 IN
IN
DATA 5
DATA 6
DATA 7 IN
DATA 8 IN
ACKNLG
OUT
BUSY OUT
Description
STROBE pulse to read data in 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.
Approximately 12-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
F-1