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Appendix F
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.
Table F-1. Pins and signals
Signal Return
Pin
Pin
1
19
2
20
3
21
4
22
5
23
6
24
7
25
8
26
9
27
10
28
11
29
Signal
STROBE
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
DATA 8
ACKNLG
BUSY
Direc-
tion
Description
IN
STROBE pulse to read data in Pulse
width must be more than 0.5
microseconds at the receiving terminal.
IN
These signals represent information
IN
of the 1st to 8th bits of parallel
IN
data, respectively Each signal is
at HIGH level when data is logical
IN
1 and LOW when it is logical 0.
IN
IN
OUT
Approximately 12-microsecond pulse.
LOW indicates that data has been
received and that the printer is ready to
accept more data.
OUT
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