Help writing 16-bit data via Modbus to a VFD

[Steve-Mcl]

@grant1

To start with, all I want to send is START and FORWARD, so I presume (per the above table):

Then you can simply set the value to 1 for stop or 2 for start.

in essance, that is

bit	hex	binary	decimal
0	0x0001	0000 0000 0000 0001	1
1	0x0002	0000 0000 0000 0010	2

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The difficulty comes when you need to track actual value and set/clear bits before writing.

The 2nd difficulty is when you need to set multiple bits.

I recommend you make a helper function using this code - probably a good candidate for a link-call or subflow.