Write MB reg

Hi!
I have a digi. sensor that can measure for example temp. etc. It communicates over modbus rtu.
I am trying to write reg. 42 (write holding reg. / func 06/16) in order to change the temp. unit from C to F.
The register is 2 bytes and wants: lo=data, and hi=1.
I have tried to send arary [33;1] to the hi/lo-func and in to the MB Write-func., but this doesn't work. I have also tried [1;33]..
I wonder if I am suppose to send something like [0;33] and [1;0], but can't get it to work.. Some ideas?
I have attached the VI and what the reg. I am trying to write looks like.

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