VB7009 User Manual
35
3.2.2.
COM3 and COM4 Voltage Select Jumper
The voltage for COM3 and COM4 is controlled by the jumper labeled as “J13”. Refer to Figure 33 for the
location of the jumper.
The voltage can be 5V or +12V. +5V is the default setting. The even pin numbers correspond to
COM3. The odd pin numbers correspond to COM4. The jumper settings are shown below.
5
2
1
6
Figure 33: COM3 and COM4 voltage select jumper diagram
COM4 Setting
Pin 1
Pin 3
Pin 5
+5V (default)
Short Short Open
+12V
Open Short Short
COM3 Setting
Pin 2
Pin 4
Pin 6
+5V (default)
Short Short Open
+12V
Open Short Short
Table 29: COM3 and COM4 voltage select jumper settings
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