What actions can be done by pressing the power button on the head unit?
The PLT 400 is a single button tool - designed to be operated nearly exclusively by the software. The head unit is purposefully left to be a sing-button tool. Here are the actions of using that button:
| POWER BUTTON ACTION | BEHAVIOR DESCRIPTION |
| Hold button for 1 second | Power off the instrument. Note, after the tool is turned on, it will attempt to calibrate before it will allow you to turn it off in this way. Note the force turn off method below that can be an option if needed. |
| Hold button for 2 seconds and 2 short presses | Force instrument to switch off. Do not remove the battery to do a force switch off. |
| Simply press button | Turn on the instrument |
What does the LED indicator mean when it is flashing or remaining constant?
| LED STATUS | BEHAVIOR DESCRIPTION |
| Off | Instrument is powered off |
| Fast Steady Blinking ~2x/second | Instrument is booting up |
Slow Steady Blinking ~1x/ seconds | Instrument is waiting for connection to tablet or in initial calibration mode after being powered on. |
| Constant on | Instrument is connected |
| Blinking rapidly fast | Instrument is powered, but something may not be working properly |
| 2 Rapid fast blinks separated by ~1 sec. | Instrument is forced to switch off |
What does the Beeping sounds mean that are associated with the power button?
| BEEPING STATUS | BEHAVIOR DESCRIPTION |
| 3x short beeps every 3 seconds | Some drives are blocked in the hardware - restart of head unit required |
| Beep every 1 second and LED blinking fast | Wrong battery type is being used. Please only use the Hilti B22/4.0 battery with the PLT 400. |
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