Technical Specifications
B–4
External System Connectors
This section lists the pin assignments for your system's external connectors.
•
Bidirectional enhanced parallel port connector, 25-pin D-submini female
•
Serial connectors, 9-pin D-submini male
•
Keyboard and mouse connectors, 6-pin mini-DIN
•
SCSI port, high-density, shielded
Bidirectional Enhanced Parallel Port Connector
The bidirectional connector provides an interface to a printer or other parallel devices.
Table B–6 lists pin assignments. An asterisk (*) after a signal name indicates an active
low signal.
Table B–6: Bidirectional Parallel Port Pinouts
DB25 Pin
Signal
Function
1
STB-R*
Strobe
2
PRTD0
Printer data bit 0
3
PRTD1
Printer data bit 1
4
PRTD2
Printer data bit 2
5
PRTD3
Printer data bit 3
6
PRTD4
Printer data bit 4
7
PRTD5
Printer data bit 5
8
PRTD6
Printer data bit 6
9
PRTD7
Printer data bit 7
10
ACK*
Acknowledge
11
BUSY
Busy
12
PE
Paper end
13
SLCT
Select
14
AUTOFDXT*
Autofeed
15
ERR*
Error
16
INIT*
Initialize printer
17
SLCTIN*
Select input
18 to 25
GND
Ground
Содержание AlphaStation 255 Series
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