[Ovmsdev] simcom 7600 board not responding

[Mark Webb-Johnson]

Derek,

In testing, we found the data sheet specifications don’t work reliably on the SIM7600G we use. We also need something that works to reset BOTH the SIM5360 and SIM7600 (which have different specifications for this), and the current approach of gradually increasing the pulse time seems to work well in general.

You can factory reset the modem without issue.

The usual way of diagnosing this is to turn on verbose logging at the cellular component. You can then see rx and tx traffic from/to the modem.

Which version of code did you refresh with, and which firmware (factory, ota0 or ota1) is running? Please make sure you have at least v3.3 running to get SIM7600 support. The ‘ota status’ command will show this.

Regards, Mark.

> On 4 Jul 2023, at 5:44 PM, Derek Caudwell <d.caudwell at gmail.com> wrote:
> 
> After restoring my main unit with a full reflash via usb I have lost communication with the 7600. The 7600 itself seems to be fine as I can connect via usb and send/receive AT commands. Before I look at the hardware rx/tx lines to see if there is anything being transmitted between the two boards I thought it might be sensible to reset the 7600 with AT+CRESET. 
> 
> I take it there are no custom settings and a reset will be fine? 
> 
> Any other suggestions on diagnosing the problem?
> 
> I also noticed the PoweringOn and PoweringOff pulses do not match the specification sheet in the current code base, with a typical pulse of 500ms to turn "on" and min pulse of 2500ms to turn "off". Once I get my unit working again I will test and submit a PR.
> 
> Many thanks
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