Not getting low voltage text message

[Scott216]

I'm not getting a SMS when the battery voltage is low. If I let the battery volts go down, then charge it up, nothing happens. But then I if ask for the position: 1234.0, I get two texts back, the position I expect, and the low voltage text that I should have got when the volts first went low. See screenshot.

[DSSCircuits]

It's probably because you have the Configure Address (EEPROM 87) set to the default of REPLY TO SENDER and not REPLY BACK TO DEFAULT SMS. When a low battery interrupt is generated the Geogram ONE will try to send an SMS the phone number stored in RAM. The phone number that is stored in RAM is either the default SMS, if configured as such, or the phone number of the last SMS received (if configured to REPLY TO SENDER).

So on initial power up, if configured to REPLY TO SENDER, there is no phone number stored in RAM and the GO will continue to try and send a low battery alert to a blank number (which results in an error). It will do this each time through the loop until it receives an incoming SMS and is able to populate the phone number field in RAM. This is why you're receiving the LOW BATTERY ALERT after you send a position update request. If you don't remove power from the GO, the phone number will stay in memory and once the battery is recharged and drained again it will send the next LOW BATTERY alert to this SMS number again.

[Scott216]

Sounds like what I need to do is configure it to REPLY BACK TO DEFAULT SMS then set the default SMS number in EEPROM to my phone number. Will that work?

[DSSCircuits]

yes that will work

[Scott216]

I looked at your register map and I can't find the EEPROM register that lets me set REPLY BACK TO DEFAULT SMS. What is the register number and what value should it be? Once I set this, does it mean GO will always reply back to the SMS number in register 5?

[DSSCircuits]

EEPROM address 87 and you'll want to set it to a 1 (default is 0) and yes it will send all replies to the SMS is in register 5.

[Scott216]

If I put a my phone number into the default at register 5, but don't change register 87 and just leave it at zero, I'll still have the same problem right? Unless the GO uses the default phone number from EEPROM when the phone number in RAM is empty.