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VIA EPIA-M920 User Manual
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3.4.
COM3 and COM4 Voltage Jumper
The voltage for COM3 and COM4 is controlled by the jumper labeled as “J13”. The voltage can be either
+5V or +12V. +5V is the default setting. The odd pin numbers correspond to COM3. The even pin
numbers correspond to COM4. The jumper settings are shown below.
Figure 37: COM3 and COM4 voltage jumper diagram
COM3 Settings
Pin 2
Pin 4
Pin 6
+5V (default)
Short
Short
Open
+12V
Open
Short
Short
COM4 Settings
Pin 1
Pin 3
Pin 5
+5V (default)
Short
Short
Open
+12V
Open
Short
Short
Table 33: COM3 and COM4 voltage jumper settings