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moved to Parallel Port Signal Detail

Fig 10-2
DB-25
Pin		 Driven by Signal Name Cent
Pin
1 Host /Strobe 1 Tells the printer that data is available on Data 0-7. Pulse width must be more than 0.5us. Must be high if Busy or /Acknowledge are also high. driven by 7405 inverting open collector buffers, pulled to +5 volts via 4.7K resistors.
2 Host Data 0 2 Data lines must be valid 0.5us before falling edge of Strobe signal.

The Data Out pins were orginally driven by a 74LS374 octal latch, which could source 2.6 mA and sink 24 mA. It is essential that the external device not try to pull these lines to ground, as this might cause the 74LS374 to source more current than it could handle without damage. Exception: bidirectional printer ports allow the 74LS374 (or equivalent) driver chip to be tri-stated.
3 Host Data 1 3
4 Host Data 2 4
5 Host Data 3 5
6 Host Data 4 6
7 Host Data 5 7
8 Host Data 6 8
9 Host Data 7 9
10 Printer /Ack 10 Pulse width approx 3us. Asserted when Busy goes off or after data is accepted. Also pulsed when printer comes on line after power on, reset, or operater selects online mode. Inverted in Status Input register
11 Printer Busy 11 Indicates that the printer is busy. Asserted during reading of data, printing, errors, and when offline.
12 Printer Out of Paper 12
13 Printer Select 13 High when printer is online.
14 Host /Auto Feed 14 driven by 7405 inverting open collector buffers, pulled to +5 volts via 4.7K resistors.
15 Printer /Error 32
16 Host /Initialize 31 driven by 7405 inverting open collector buffers, pulled to +5 volts via 4.7K resistors. Double inverted from the control register.
17 Host /Select Input 36 driven by 7405 inverting open collector buffers, pulled to +5 volts via 4.7K resistors.
18-35 Both Ground 30
Ground returns 19-29

see also:

file: /Techref/io/parallel.htm, 7KB, , updated: 2009/9/17 12:05, local time: 2024/11/25 16:07,
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