Epson FX-85 User Manual - Page 87

Appendix K-the Parallel Interface

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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 Signal Return Pin Pin Signal 1 19 STROBE 2 20 DATA 1 3 21 DATA 2 4 22 DATA 3 5 23 DATA 4 6 24 DATA 5 7 25 DATA 6 8 26 DATA 7 9 27 DATA 8 10 28 ACKNLG 11 29 BUSY 12 30 PE Direction 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 of IN the 1st to 8th bits of parallel data, IN respectively Each signal is at HIGH IN level when data is logical 1 and LOW IN when it is logical 0. IN 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 2) During printing. 3) When Off-Line. 4) During printer-error state. OUT A HIGH signal indicates that the printer is out of paper. 333

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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