On 2/8/2016 3:54 PM, andy pugh wrote:
> On 8 February 2016 at 20:34, Bertho Stultiens <ber...@vagrearg.org> wrote:
>> But, I should not hijack the thread with information theory...
> In theory Modbus should be better, but I don't have any information
> about the VFD interface.
>
> That's the version of information theory that matters to me here.

Hooking up two wires and a shield for an analog interface beats reverse 
engineering a drive even on a bad day.  ;-)

Andy, you would not have any problems using Modbus, but if the drive 
parameter to register interface is not documented, then you are shooting 
in the dark.
If they are not providing docs, chances are they have issues with the 
Modbus implementation and the interface is intentionally not fully 
documented.
It should not be that difficult, regardless of your view on information 
theory.  :-)

Dave



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