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Connector Pin Numbering
Figure C-2 shows how pins are numbered on DTE
connectors:
Female DB9
9
Female DB25
13
12
11
10
25
24
23
22
Male DIN-8
Figure C-2. Pin numbering system used for wiring
cabling.
The male DIN-8 connector is for a Macintosh cable. The
other connectors could be used on either cabling or adapters
(for example, a DB9-to-DB25 adapter).
C-2 Pinouts and Wiring Diagrams
5
4
3
2
1
8
7
6
9
8
7
6
5
4
3
2
1
21
20
19
18
17
16
15
14
2
1
3
5
4
8
6
7
Male DB9
1
2
3
4
5
6
7
8
9
Male DB25
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
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