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Table H-l. Parallel interface connector signals.<br />
PIN SIGNAL NAME DIRECTION FUNCTION<br />
I STROBE IN The STROBE pulse is used to<br />
read data. When this signal<br />
goes low, data is read in.<br />
DATA 1<br />
3 DATA 2 The signals on pins 2-9<br />
d DATA 3 represent parallel data<br />
5 DATA 4 1: bits l-8. Each signal is at<br />
5 DATA 5 a high level for logical 1<br />
DATA 6 INN and at a low level for a<br />
L DATA 7 IN logical 0.<br />
Q DATA 8 IN<br />
<strong>10</strong> ACK OUT This 9-microsecond pulse<br />
acknowledges the receipt<br />
of data.<br />
11 BUSY<br />
OUT The BUSY signal indicates<br />
the operating condition of<br />
the printer. When this<br />
signal goes low, the printer<br />
is ready to accept data.<br />
12<br />
13<br />
14-15<br />
16<br />
17<br />
18<br />
19-30<br />
PAPER END<br />
SELECTED<br />
N/C -<br />
SIGNAL GND -<br />
CHASSIS GND -<br />
OUT<br />
OUT<br />
+ SVDC OUT<br />
TWISTED PAIR -<br />
RETURN GND<br />
31 INPUT PRIME IN<br />
32 ERROR<br />
33 EXT GND<br />
34-35 N/C<br />
36 N/C<br />
OUT<br />
This signal is used to indicate<br />
“paper-out” status to the<br />
computer. This signal is<br />
normally low; when DIP<br />
switch l-l is off, this<br />
signal is held low.<br />
The SELECTED signal is high<br />
when the printer is on-line.<br />
Unused.<br />
Signal ground.<br />
Chassis ground.<br />
External supply of + SVDC<br />
power (max. 50 mA).<br />
Return line of various<br />
Resets all control circuits.<br />
A low signal level<br />
initializes the printer and<br />
clears buffer memory.<br />
signals.<br />
This signal goes low when<br />
the printer detects an<br />
error.<br />
External<br />
Unused.<br />
ground.<br />
TTL high level.<br />
131
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