[Nut-upsdev] Best UPS protocol for home-made firmware?

[Chris Boot]

On 19/04/2010 11:13, Arjen de Korte wrote:
> Citeren Chris Boot <bootc at bootc.net>:
>
>> I'd really like this UPS to interface with NUT so that I can use a 
>> variety of tools to monitor it, such as Nagios and cacti, etc... I 
>> really don't want to have to write my own driver for NUT if I can 
>> avoid doing so, so the main question is which serial interface is the 
>> most sane for me to implement in my controller. The megatec driver 
>> seems to be one of the most popular but I can't find much 
>> documentation about the protocol.
>
> I don't think this is the most suitable protocol, but nevertheless:
>
>     http://www.networkupstools.org/protocols/megatec.html
>

Thanks for the link - I had seen this before but I'm not sure if it 
conveys the whole picture. I guess I can always read the megatec driver 
source to figure out what it wants to do :-)

But if it isn't the most suitable driver, do you have a better one in mind?

>> In addition I'm wondering how much NUT looks at various parameters 
>> like input / battery / line voltage, since in my case it would be 
>> 12-18V and not the more common 110/230V. :-)
>
> NUT basically only really cares about the flags in 'ups.status', all 
> other variables are just bells-and-whistles and will not be used to 
> determine when it is time to shutdown. So the values of input-, 
> output- and battery voltage are irrelevant, they will be relayed as is.

I thought as much, but it's good to have this confirmed. Thanks.

Cheers,
Chris