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Thefollowingdescribesthepinoutoftheparallel(Centronics-type)inter-
faceconnector(signalswhichare low whenactiveate overlined):
Pin Name Function
1 STROBE
Goes fromhighto low (for20.5ps) when active
I
2 I DATAO
I Highwhen active
I
3“ DATA1 Highwhen active
4
DATA2
High when active
5 DATA3 High when active
6
DATA4
High when active
7
DATA5
High when active
8
DATA6
High when active
9 DATA7
High when active
“
10 ACK
5ys low pulse acknowledges receipt of data
11 BUSY Low when printer ready to receive data
12 PAPER
High when paper
OULCanbe disabledwith DIP switch
setting
13 SELECT Highwhenprinteris on-line
I 14,15 I N/’C
I
I
16 SIGNAL GND Signal ground
17 CHASSIS Chassis ground (isolated from signal ground)
18 +5V
+5V DC output from ~inter
19-30 GND Twisted pair ground rehrrn
31 RESET When this input signal is low, printer is reset
32 ERROR
Outputs low when printer cannot continue, due to an error
33 j EXT GND External ground
34,35 NI’C
36 SELECT IN Always high
102