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Chapter 2 External Connectors
8
Parallel Port
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Pin Number Signal Description Pin Number Signal Description
1 Strobe5 10
Acknowledge
b
2 Data bit 06 11 Busy
3
Data bit 1
a
12 Paper end
4
Data bit 2
a
13 Select
5
Data bit 3
a
14
Auto line feed
b
6
Data bit 4
a
15 Error1
7
Data bit 5
a
16
Initialize printer
b
8
Data bit 6
a
17
Select in
b
9
Data bit 7
a
18-25 Signal ground
a. All data bits are sent to a printer in an 8-bit parallel format.
b. The signal is active low.
USB
1
1
2
2
3
3
4
4
Pin Number Signal Description
1 VBUS
2 D+
3 D-
4 GND
NOTE Use of the USB port is supported for printers, scanners, and external modems.