PXS8 Sporadically Powers Off | Telit Cinterion IoT Developer Community
September 9, 2020 - 10:47pm, 1496 views
Hello,
We have a number of PXS8 modules on the CDMA Sprint network. After an indeterminate interval (anywhere from 2 to 32 hours), some of the modules begin to shut off. Several of the modules are most prone to this behavior, while others are less likely to power off, and some do not exhibit this behavior at all. Two modules in particular usually shut off within a few seconds of each other. I can restore each module by toggling the IGT line.
Here are some more details that I have gathered:
- I disabled AT^SCFG="MEShutdown/OnIgnition", but the problem persists.
- The shutdowns do not appear to be caused by an under/over voltage or temperature. (To my knowledge, no URC is received to indicate either of these scenarios.)
- The power supply does not appear to be the issue. Several modules are powered with the same supply.
- I am using the default configuration of AT^SDPORT=6. When a module powers off, the host device logs that the USB connection was removed. A few seconds later, it sees the USB connection again and treats it as a new device. A few seconds after this, the USB connection is removed again.
- The failures do not occur at a consistent time of the day.
- All modules have the same firmware revision: 03.320.
Please let me know if anyone has an idea of what might be causing this.
Thanks,
Christopher
Hello,
Are these modules located in the field or in the lab? If several modules are connected to the same power source, maybe it is the power source issue. How about the hardware - is it any developer board or proprietary hardware? In such a case there is a probability of design failures. Do you have any observations, logs etc. - please check if there is anything common around the moment when it happens. What are the modules used for? What features are used?
Regards,
Bartłomiej
Hi Bartłomiej,
Thank you for your reply.
These modules are in the lab. The hardware is proprietary.
I don't think the power supply is the issue. While the same supply is used for multiple modules, two of the modules that often power off are on different supplies. Additionally, there are some modules on the same supplies that do not power off.
The modules are used for sending/receiving SMS. However, the modules are not in use when they power off--they do not even have a valid subscription at the moment.
I am going to change the AT^SCFG="CDMA/Operator/Store" setting to see if the behavior changes. Perhaps the cause has something to do with OMA DM.
Thanks,
Christopher
Hello,
I don't have experience with American networks unfortunately. The module should be rebooted, not switched off after OMA DM session. But I think it's worth checking anyway. There is also some logging possible for OMA DM and 'OMADM:' URC which should show something.
Regards,
Bartłomiej
Hi Bartłomiej,
Okay, I will see if the OMA DM trail leads anywhere.
Thanks for your help.
Christopher