That line from the vertiv manual is so cryptic. If the there isn’t a standard set of registers for this purpose then there must be a specific AC meter it supports. I don’t see one on the listed accessories in the literature though.
Meanwhile the same manual has explicit instructions for setting up to get data from a particular brand of battery controller with modbus. On the topic of AC meters I just get, “oh yeah we can meters with modbus.” I did send a message to support. I’ll bet $5 they don’t know either. Thanks for all the info everyone. Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: AF <af-boun...@af.afmug.com> on behalf of Forrest Christian (List Account) <li...@packetflux.com> Sent: Thursday, October 26, 2023 4:08:11 PM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] Modbus 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<mailto: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<mailto: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<mailto: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<mailto: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<mailto:AF@af.afmug.com> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com<mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com<mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- - Forrest
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