[Ovmsdev] Refactoring MODEM/SIMCOM for v3.3

Craig Leres leres at xse.com
Fri Aug 21 10:23:27 HKT 2020

On 2020-08-20 18:26, Mark Webb-Johnson wrote:
> Did you ever get that SIM7600 working? It certainly requires some 
> changes to the CMUX arrangements, as there is no CMUXSRVPORT command 
> implemented.

Nope. I spent some time looking at the documentation and concluded it 
was a larger project than I wanted to engage at the time.

> We’re also seeing high peak power usage on that module. 450ma to 600ma 
> at 5V. Can’t run it off most laptop/computer USB 2 ports (the power draw 
> brings voltage down to 4.5V or so, and brownouts occur). It seems to run 
> ok on USB 3. We’re probably going to have to redesign the modem board 
> power supply to get this working reliably. On the positive side, 
> reception does seem better than the 5360 - I can even get a single in 
> the cellular blackhole that is my home office.

Interesting. The 12V wart I'm powering my dev ovms module off of is only 
rated for 500 mA. But I did little more than enter some AT commands and 
verify that it could register on the cell network.

Better reception sounds good; my motivation in going this direction is 
that at a minimum it would give us a better selection of cell towers to 
talk to.


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