![background image](http://html.mh-extra.com/html/advantech/trek-120-series/trek-120-series_user-manual_2856470035.webp)
record_index_overflow
The number of temperature and humidity pens has reached 2000.
falling_record_index_overflow
The number of falling pens has reached 30.
lora_transmission_stop
The external battery voltage is lower than the voltage configuration value before
wireless transmission.
internal_battery_low
The internal battery voltage has been lower than 2.4v in front of the wireless
transmission
external_battery_low
Set the external voltage limit, stop LoRa transmission.