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Parallel interface pin assignment table
Pin No. Signal Input/Output Description
1 STROBE Input Strobe signal for 8-bit data
2−9 DATA1-8 Input 8-bit parallel signal
10 ACKNLG Output 8-bit data request signal
11 BUSY Output Signal showing printer busy
12 PERROR Output Signal showing paper out
13 SELECT Output Signal showing printer "on line" (printing)
or "off line" (pause)
14 AUTOFD Input Invalidness (ignorance)
15 NC − Not used
16 S.GND − Signal ground
17 FGND − Frame ground
18 P.L.H Output Signal showing peripheral logic high (pull
up to +5V with 1.2 KΩ)
19−30 GND − Ground for twisted pair return
31 INIT Input Printer reset
32 FAULT Output Signal showing printer error
33−35 NC − Not used
36 SELECTIN Input Invalidness (ignorance)