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Thefollowingdescribesthepinoutoftheparallel(Centronics-type)inter-
faceconnector(signalswhicharelow whenactiveareoverlined):
Pin Name Function
1 STROBE
Goes from high to low (for 20.5ps) when active
2 \ DATAO
High when active
3. DATA1
High when active
4 DATA2 High when active
I
5 I DATA3
I Hi~hwhen active
I
6
DATA4 High when active
7
DATA5 High when active
8
DATA6 High when active
9 DATA7 Hieh when active
10
ACK 5p.slowpulseacknowledgesreceiptofdata
11
BUSY Lowwhenprinterreadytoreceivedata
I
12
1
PAPER
I
High when paper out. Can be disabled with DIP switch
setting
1
13
SELECT High when printer is on-line
14, 15
N/C
16
SIGNAL GND Signal ground
17
I CHASSIS I Chassis ground (isolated from signal ground)
18
+5V +5v DC Outmt from minter
19-30
GND Twisted pair ground return
31
RESET
When this input signal is low, printer is reset
32
ERROR OutDutslow when printer cannot continue, due to an error
I 33 I EXT GND
I External mound
I
.
34,35
N/C
36
SELECT IN Always high
102