TNC3 User Guide
Configuring the Power Settings
You can check the battery level and configure the power settings from the
“Power Settings” dialog. The TNC3 is fully charged when it reads
approximately 4.2V (4200mV). The nominal battery voltage is 3.7V. Avoid
operating the TNC below 3.4V, otherwise erratic behavior may occur.
The TNC may be configured to automatically turn itself on when USB power
is present, and automatically turn itself off when USB power is not present.
This is often desirable when using the TNC in a vehicle. These settings are
controlled independent of one another.
• To power on when USB power is present, select the “Power on with
USB Power” option.
• To power off when USB power is removed, select the “Power off with
USB Power” option.
The TNC3 will still power on via the Power button when USB power is not
present and “Power off with USB Power” is enabled.
Please be aware: It is a frequent source of confusion for users when they have removed a TNC
normally used in a vehicle and have forgotten that these setting are enabled. The TNC will turn itself
on and off when connected/disconnected from USB power.
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