Pin Assignment for (Parallel Port) Centronics Printer Connector (TTL Logic)
(Amphenol 57-30360). IN: computer->printer, OUT: printer->computer
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1 /STROBE IN Normal=High, Data read-in when Low for at least 0.5f, pair
2 DATA 0 IN (Pair with pin 20) Least significant Bit
3 DATA 1 IN (Pair with pin 21)
4 DATA 2 IN (Pair with pin 22)
5 DATA 3 IN (Pair with pin 23)
6 DATA 4 IN (Pair with pin 24)
7 DATA 5 IN (Pair with pin 25)
8 DATA 6 IN (Pair with pin 26)
9 DATA 7 IN (Pair with pin 27), Most significant Bit
10 /ACK OUT w0,5fs pulse, low=data received and printer ready, pair 28
11 BUSY OUT High: printer is busy, cannot accept data, pair with pin 2
12 PE OUT High=printer out of paper (older printers: GND)
13 SELECT OUT High:printer is in the selected state (On-Line) (old: N/C)
14 /AF IN low=paper fed 1 line after printing, not always used/old:
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15 N/C -- older printers: GND
16 GND -- Logic Ground Level (Signal Ground)
17 GND -- Chassis Ground
18 +5V -- Printer's +5V DC 80mA max., not always used
19-30 GND -- Signal Ground
31 /INIT IN Normal=High, Low for w0,5fs=printer RESET, buffer cleared,
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32 /ERROR OUT Low=Paper End State, Off-Line State, or Error State, pair
33 GND -- Signal Ground, sometimes External Ground
34 N/C -- (older printers: CLK, pair with pin 33)
35 +5V +5V DC through a 4.7Kj resistor, not always used, sometimes: T
T
36 /SLCTIN IN Low=Data Entry Possible, High=Printer Off-Line, older prin
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