Yes, and no. The modbus protocol defines how to move data between two devices. However, the contents of the data being passed is vendor-defined and there aren't any industry standards I'm aware of (although it wouldn't surprise me if there were).
Every vendor that produces a modbus-capable device usually publishes some sort of guide to the modbus registers for each device. For instance, a quick google search turned up this document: https://www.vertiv.com/4ac5f2/globalassets/products/monitoring-control-and-management/monitoring/modbus-protocol-for-bdsu-reference-guide.pdf "modbus register map" or "modbus communication guide" or simply "modbus" when added to your vendor or product name often will turn up the right document. Just FYI, A couple of years ago, I would have suggested you provide me with the vendor of the equipment, and I'd make you a firmware load for the sitemonitor serial module to be able to read this, but that codebase needs to be re-written to support the base 3. At some point in the future I'm going to resume doing those requests in which case you'd end up with a module which pulls data from this device. Doesn't help you right now though. On Thu, Oct 26, 2023 at 10:25 AM <dmmoff...@gmail.com> wrote: > Is it likely that AC meters for monitoring circuits or subpanels have a > standard message format? > > > -----Original Message----- > From: AF <af-boun...@af.afmug.com> On Behalf Of Mark Radabaugh > Sent: Thursday, October 26, 2023 10:52 AM > To: AnimalFarm Microwave Users Group <af@af.afmug.com> > Subject: Re: [AFMUG] Modbus > > Modbus is an ancient serial protocol to pass values back and forth. It’s > very open but also somewhat vendor specific. You can send any message you > like from A <->B but the two devices have to know what the specific message > means. Various industries have defined the message content but I would be > somewhat surprised if a Vertiv rectifier knows what to do with the > information from a meter. > > Tons of information online, and it’s not a hard protocol to code for. > Used to do it in BASIC years ago. There are two protocols - MODBUS and > MODBUS RTU. The RTU protocol is much more difficult to work with due to > timing requirements, MODBUS itself is just standard serial at a baud rate > and timing of responses is not critical at all. > > Mark > > > > > > On Oct 26, 2023, at 7:38 AM, Adam Moffett <dmmoff...@gmail.com> wrote: > > > > I've never used modbus. I'm looking at AC usage meters that support > modbus over RS-485. And the controller on my Vertiv rectifier says this > in the manual: > > > > "e) Modbus Protocol: The NCU can communicate with an AC Meter using the > Modbus protocol." > > > > ....and that's literally all it says. Is this something standardized > where I can expect any modbus capable AC meter to work the same? Is this > plug and play or would I have to learn yet another discipline? > > > > If it's not an easy answer I can take it to Vertiv tech support. Just > wondering if this group magically has the answer. > > > > -- > > AF mailing list > > AF@af.afmug.com > > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- - Forrest
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