[Nut-upsdev] APC Modbus support is finally here!

Jim Klimov jimklimov+nut at gmail.com
Sat Nov 18 20:21:34 GMT 2023

Got an update for APC Modbus users: a new PR is waiting for real-life
testing for settable variables and instant commands support.


As before, a custom build of libmodbus may be needed for USB support
(detailed in the earlier PR), but Serial and TCP may already be well served
by a distro near you!


On Sun, Oct 22, 2023, 01:08 Jim Klimov <jimklimov+nut at gmail.com> wrote:

> Hello fellow NUTs :)
>   It is my great pleasure to get a bit of sunshine from other people's
> work, and announce that the initial pull request for `apc_modbus` NUT
> driver has recently been merged to the main NUT codebase, so it would be
> part of an eventual 2.8.1 release. Great thanks go to Axel Gembe for the
> implementation, and to numerous community members for testing as well as
> their bug-fix and feature suggestions. It is my understanding that some
> thanks also goes to the apcupsd project that served as inspiration for data
> points that we can collect from the devices, as well as for its unfortunate
> development inactivity that convinced someone to step up and implement a
> native NUT driver for the "new" APC devices (~2010+) which all but
> deprecated USB HID support. Really, this feature was very long awaited!
>   At the moment the driver is "read-only", with commands and variables to
> be implemented later (hopefully some coming before 2.8.1 cut-off point). It
> can be used with the already published and packaged libmodbus versions for
> Serial-port and TCP support (with add-in network management cards). However
> please note that USB support is not currently part of the upstream library,
> but rather is provided by a fork (PR pending). It is not certain
> whether/when exactly such a feature will appear in the upstream library
> project - it does not seem very actively maintained at the moment :\
>   For more details please see
> https://github.com/networkupstools/nut/pull/2063 and
> https://github.com/networkupstools/nut/issue/139.
> Jim Klimov
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