HELP needed: MODBUS config for 3 phase RS-485 VFD

Configuration
1

Hey Modbus ppl.

I have a bunch of VFD Modbus/RS-485 controlled 3 phase pumps being delivered to my brewery that Im intending on interfacing to. They havent been delivered yet but Im doing all the background work now as I am putting in all new gear and I wont have the time during our closure for installation to experiment.

Need a little help in the interim as to how to send the proper data to the VFD as per the images below.

First of all - am I saving myself by using RTU instead of ASCII because it would appear that I dont need to convert RTU to a hex format before I send it to the MODBUS platform becasue its already in HEX by default?

Also, In the case of the info below - is the following addressing correct based on the 2000H being in hex or do I absolutely need to convert it to Float32???

For example - should “RUN FWD” command (22Hex) be done like this:

service: modbus.write_register
data:
  unit: <target slave address>
  hub: <hub name>
  address: 2000
  value: [0x0000, 0x0022]

OR

service: modbus.write_register
data:
  unit: <target slave address>
  hub: <hub name>
  address: 2000
  value: 22

Additionally, does the Address need to be represented in float32 or is plain hex ok (as above)?

Many thanks

image

2

for anyone that comes across this.
HA uses decimal for RTU comms so any communication that needs to be done needs to be run through a DEC-HEX converter.