Com Voltage Jumpers; Com2 Voltage Jumper; Figure 32: Com2 Voltage Jumper Diagram; Table 28: Com2 Voltage Jumper Settings - VIA Technologies VB7009 User Manual

3.2. COM Voltage Jumpers

Each of the additional COM ports (available through the onboard COM pin headers, see page 20) 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 Jumper

The voltage for COM2 is controlled by the jumper labeled as "J12". The voltage can be either +5V or
+12V. +5V is the default setting. The jumper settings are shown below.

Figure 32: COM2 voltage jumper diagram

Table 28: COM2 voltage jumper settings

Settings Pin 1
+5V (default) Short
+12V Open
VIA VB7009 User Manual
Pin 2 Pin 3
Short Open
Short Short
32