June 28, 2018 - 1:05pm, 1862 views
Как изменить дату и время EHS6t?
Please only use English language on this forum.
There is AT+CCLK command to set date and time. Format is "yy/mm/dd,hh:mm:ss", where the characters indicate the two last digits of the year, followed by month, day, hour, minutes, seconds; for example 6th of March 2013, 22:10:00 hours equals to "13/03/06,22:10:00".
There is also an interesting command AT+CTZU which enables an automatic time zone update from the wireless network (AT+CTZU=1 to enable). But you need to make sure if the network supports it.
Time is not saved after reboot. What to do?
Time should be sustained during reboot and when the podule is switched off if the power is not disconnected.
Nevetheless it is recommended to implement some kind of time synchronization mechanism.
the problem is that the module is on the machine and there are places where there is no communication. Unable to synchronize . What do you recommend?
If the time is critical the time synchronization should be performed to ****** accuracy and avoid any time drifting. I assume that the device is moving and it could synchronize the time at leasts from time to time when there is a network coverage. As it is a communications device it is not mounted in a place where there is no coverage at all.
According to the terminal documentation after the normal shutdown (sending the AT^SMSO command) the RTC is working continuously.
When power fails for more than 15s the RTC will be reset. So the problem could only be when you would like to cut off the power completely, for example to save energy, as the terminal does not have a separate connector to feed RTC. It would be possible if you had only a module and and would like to design your own hardware.
And what is your scenario? Please describe the use case.
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