The Parallel Interface - Epson FX-80 User Manual

Appendix 0
The Parallel Interface
The FX-80 uses a parallel interface to communicate with the com-
puter; this appendix describes it.
o
Connector pin assignments and a description of respective interface
signals are shown in Table
0-1.
Table 0-1. Pins and Signals
Signal Return
Signal
Direction
Pint Pint
1 19 STROBE
IN STROBE Pulse to read data in.
Pulse width must be more than 0.5
microseconds at the receiving
terminal.
2 20 DATA 1 IN (Signal Pin Nos. 2 - 9) These signals
3 21 DATA 2 IN represent information of the 1 st to
4 22 DATA 3 IN 8th bits of parallel data, respectively.
5 23 DATA 4 IN Each signal is at HIGH level when
6 24 DATA 5 IN data is logical 1 and LOW when it is
7 25 DATA 6
IN 10gical0.
8
26 DATA 7 IN
9 27 DATA 8 IN
10 28 ACKNLG OUT Approximately 5-microsecond pulse.
LOW indicates that data has been
received and that the printer is
ready to accept more data.
11 29 BUSY OUT 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) Off-Line.
4) During printer-error st,ate.
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