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.
> 
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