%&'"()*+,,-,,.".
4.1.6 System Time and HW time
The owa4x unit is provided with two different clocks:
The CPU system time: This clock is able to maintain system time in
normal operation but loses the time when owa4x is powered off or is
put into a low power mode.
The RTC module: This is a dedicated Real Time Clock (RTC)
module which is battery backed up so that the time remains correct
even when power is removed. The duration of the internal battery is
10 years.
When the owa4x returns from OFF or STANDBY modes, the CPU system time
is automatically updated with the value in the RTC time. Hence any changes to
the time should be performed on the RTC time as this is the ‘master’.
owa4x models have an additional and more precise time reference that is
obtained from GNSS data. When available, use this as a reference to set the
RTC value.
4.1.7 Accelerometer
The owa4x carries by default a 3 axis accelerometer with ±2g/±4g/±8g/±16g
configurable ranges and 1mg/2mg/4mg/12mg sensitivity respectively.
The accelerometer can be set in the wake up mask of Standby or OFF mode, in
order to wake up when there is a movement bigger than the preconfigured one.
The data from the axis registers can also be obtained using a function of the
RTU library, with or without gravity acceleration filter, which can be of use to get
the inclination of the device. See API for more information on these functions.
4.1.8 Watchdog
There is a HW watchdog available under /dev/watchdog and a SW watchdog
that can be controlled via systemd. You can get more information on how to use
them in the Programming Guide (BOK 100 9007).
/&
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