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Modbus 16bit addresses

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zipfrog2022:
I am working on setting up some fairly basic actuator controls. All my single bit items work fine. What I need to know is how to read a 16bit address or write a 16bit address.

To send a operation command lets say for open / closed its function code 06, offset is 4096, bit 0= open, bit 1=closed, bit 2= setpoint.

How would I read these or write these. I would like to either use selector switch to change from open close using the bits above or push button to send the open / closed commands.

Help understanding how to work with the 16bit addresses would be greatly appreciated.

Thanks

Archie:
AdvancedHMI uses function code 3 to read 16 bit registers and function code 16 to write them.

Normally you use addresses in the 40000+ range, such as 40001

I

zipfrog2022:
Can you not use function code 6? 16 is to write multiple registers and 6 is to write a single register.

--- Quote from: Archie on February 12, 2024, 01:31:03 PM ---AdvancedHMI uses function code 3 to read 16 bit registers and function code 16 to write them.

Normally you use addresses in the 40000+ range, such as 40001

I

--- End quote ---

Archie:
I checked the code and it will use function code 6 if there is only a single register to read.

zipfrog2022:
Ok

Thank You

--- Quote from: Archie on February 12, 2024, 07:16:33 PM ---I checked the code and it will use function code 6 if there is only a single register to read.

--- End quote ---

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