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8
7
4
6
21
DB-9 Serial Port
5
5----------Ground--------------------------------------Ground----------8
3----------Transmit------------------------------------Receive---------3
2----------Receive-------------------------------------Transmit--------5
8 Pin Mini-DIN Port
8
1 2 3 4 5
6 7
8 9
3
4
5
6
7
8
2
Figure 2. Mini-DIN to DB-9 Connection for RS-232 Signals
5
3
2
Purple
Red
Yellow
Purple
Red
Yellow
5
4
3
2
1
9
8
7
6
Unit C
Unit B
Unit A
Female Serial Cable Front
Purple (Ground)
Red
Yellow
Figure 3. Typical Multiple Device (Addressable) Wiring Conguration