Modbus RTU - Function 16 (write multiple holding registers)

[Pawel]

Hi,
I have problem with modbus rtu integration with NIBE Heat pump. I have established connection via modbus rtu with modbus 40 extension of this heat pump. Reading working properly, but if i want to write some registers, i have to use write multiple holding registers (function 16), despite of fact that I write only one register.

If I use mb:writeregisters function there is no possibility to choose 06 function or 16 function, but i have to have 16 function to proper write command 

using 

Code:

mb:writeregisters (registers, value, nil)

doesn't work.

Do you have any idea how do that? Maybe using mapping of modbus registers resolve problem?

[admin]

Try this, it will force using command 16 instead of 06 even when writing to a single register:

Code:

mb:writemultipleregisters(register, value)

[Pawel]

Nice,

Thanks you.