VB7009 User Manual
34
3.2.
COM Voltage Select Jumpers
Each of the additional COM ports (available through the onboard COM pin headers, see page 22) can
support both +5V and +12V. COM2 has its own pin header block. COM3 and COM4 share a single pin
header block. COM5 and COM6 also share a single pin header block.
3.2.1.
COM2 Voltage Select Jumper
The voltage for COM2 is controlled by the jumper labeled as “J12”. The voltage can be 5V or
+12V. +5V is the default setting. The jumper settings are shown below.
1
Figure 32: COM2 voltage select jumper diagram
Setting
Pin 1
Pin 2
Pin 3
+5V (default)
Short Short Open
+12V
Open Short Short
Table 28: COM2 voltage select jumper settings
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