Modbus on HC3

[mannerman 0]

Hello

 

I have aircondition which i can steer thru rs485 modbus. Does anyone has a sollution for this?

 

[Remi 11]

Something like this?

 

Just use the search function on the forum "RS485"...

 

 

Edit: I missed the "HC3" in the title...My proposed solution is for HC2...

Edited June 25, 2020 by Remi

[tinman 1,070]

you can use (dedicated) gateway from Eutonomy, 

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That euLINK gateway supports HCL, HC2, HC3 and Yubii/HC3L

 

 

Edited December 9, 2021 by tinman

[Remi 11]

@tinman

Interesting product, bit expensive tho (almost 500 euro)

Do you perhaps know if they ship to the Netherlands?

(I couldnt find the information on the site with google translate)

 

[rangee 32]

If you can analyze 485 packet,  use elfin-ew11.

Its support  tcp/ip<>rs484

[Rait 6]

A bit late but... you can get a cheap serial to TCP module. then you can easily communicate with your device from HC3 by reading and sending serial packets over TCP. The modbus packet is actually very straightforward: 

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[wpeeters 30]

@Rait, by coincidence at this very moment I'm struggling with the easy modbus communication.

Why do I have 2 hex values in the address and the command? It is documented like this but I don't understand. Is it because it's 32 bit?

 

User Adjustable  Controller Address	Write to   Single Coil	Single Coil Address	Command Turn ON	Error Check Calculated Automatically
0x10	0x05	0x00   0x01	0xFF   0x00	0xDE   0xBB

[Rait 6]

@wpeeters one 0xHH hex value is 8 bits. So Coil address, command and CRC is 16 bits. Depending on your device, data may be stored in registers as larger values. For instance if you want to query a 32bit value from Holding registers, you will need to send: 01 03 0001 0002 95CB

 

Btw, a very nifty online tool for quickly debugging your packets is 

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[wpeeters 30]

Hi @Rait

Thanks for the info but now I'm more confused. Are the values in my documentation 16bit or 32bit?
I tried the parser and I already noticed one possible mistake I made. I initially use 16 as the address (converting from Hex to Decimal). But it seems I may not do that like that.

In the below image you can see it already matching more or less not with the documentation. I'll check later if it match my values in node-red.

However I still don't understand how to enter the CRC values in the parser. In the image, I used the ones that the parser recommended. Not the ones from the documentation I think.

Any idea how I should convert them to values that can be checked with the parser?

 

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[Napil 0]

In Poland, there are stores offering devices from the industrial automation and electronics industry. I recommend Consteel Electronics, it will help you choose the right equipment for your inquiry.

[Napil 0]

In Poland, there are stores offering devices from the industrial automation and electronics industry. I recommend Consteel Electronics, it will help you choose the right equipment for your inquiry.

[Marco Vicamini 0]

My suggestion is to use our Modbus to Z-Wave converter compatible with the major heat pumps and PV inversters brand. 

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