Modbus write multiple register

[ecodom]

Hi to all,

I have to write a single register to a device that only supports Function 16

If I use this it's not working

Code:

--COMANDO ON/OFF
 mb:writeregisters(33822,32)

but if I add another register it'll works

Code:

--COMANDO ON/OFF
 mb:writeregisters(33822,32,0)

I suspect that the function automatically switches between function 6 and 16 based on the number of registers it has to write.

I know it makes little sense to use MultipleRegister to write a single register but that's the way the device works and I can't change it so I just want to know if is it possibile to "force" function 16 passing only one register.

Thank you

[admin]

You can force function #16 for single write like this:

Code:

mb:writemultipleregisters(33822,32)

[ecodom]

Perfect, works like a charm!

Thank you