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
