Appendix K
The Parallel Interface
The FX printer uses a parallel interface to communicate with the
computer; this appendix describes it.
Connector pin assignments and a description of respective interface
signals are shown in Table
K-1.
Table K-1. Pins and signals
11
12
29
30
Signal
Return
Signal
Direc-
Pin
Pin
tion
1
19
STROBE
IN
2
20
DATA 1
IN
3
21
DATA 2
IN
4
22
DATA 3
IN
5
23
DATA 4
IN
6
24
DATA 5
IN
7
25
DATA 6
IN
8
26
DATA 7
IN
9
27
DATA 8
IN
10
28
ACKNLG OUT
BUSY OUT
PE
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
2) During printing.
3) When Off-Line.
4) During printer-error state.
A HIGH signal indicates that the
printer is out of paper.
333
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