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There is also a problem with scanning devices, not all manufacturers lay this functionality. For example, Wesser Heat Meter does not have this functionality and does not even have an address provided by the Protocol. It has only ID and only it can be used to run a survey.
Sorry for my English, I use online translator
Thanks for the links. But the problem I have is not with the description of the Protocol, and with real data from the devices. The Protocol gives a greater freedom of choice of data transmission, which of them will choose the manufacturer only knows. I would like to see different types of data transmission from different manufacturers. At the moment I have only two devices and both transmit Variable data Structure.
At the moment I have implemented the processing of Variable Data Structure in the response.
01 03 30 00 00 08 4B 0C
So it became clear that any online calculator Modbus CRC in the calculation of CRC along with it should give the result 0
It was necessary to buy such a module, there is a description in English and you can check the information on the Protocol and the method of calculation of channels.
Write to the Chinese that they have the wrong byte sequence in the CRC. Well, if it does not help, you can try to build KpModbus.dll in the new version, where you change the sequence of bytes for CRC, and to call it KpErrorModbus.dll 🙂
Probably your device is not quite standard. If you use the specified link and check your request, the CRC is correct, the lower byte forward, according to the Modbus Protocol.
https://www.lammertbies.nl/comm/info/crc-calculation.html
Online Calc shows just the CRC value as it is.
I would like to look at this device that does not send CRC Modbus younger byte forward, I have never seen this in the factory products.
The link at the bottom has links to but in Chinese. There will be question marks instead of characters
The description indicates that the relay must be sent ON1 to be switched on. I can assume that this is the name of the button but the screens Chinese characters. Write to the sellers of this Board, or follow the links, maybe they have this program in English. If I’m right, then put this program you can use the tracking programs and see what are the parcels in the Protocol.
The Chinese may be deceiving, saying that there Modbus TCP. I was afraid to buy a Board without a description in my time. I chose the one where the list of registers for management was given.
Given the Ethernet module used, it can be assumed that there is no Modbus TCP but Modbus RTU on top of TCP. It is a relay not come across live.
Give a link to the device you purchased on AliExpress
When connecting via RTU, you are informed that the address does not match
What exactly do you use from the Chinese site ?
On AliExpress was not a description of the registers ?screen1
screen2
screen3
screen4In the input channel, specify the output channel number, in the output channel, configure the Standard command. You can also add a formula if necessary, without adding a formula additional actions are not required. Sorry, but my test system is in Russian.
On the website in addition to the documentation seems to be the video lessons, well, you just have to try different options.
CmdVal, Cmd double The command value transmitted to Server before calculation
http://doc.rapidscada.net/content/en/software-configuration/using-formulas.html
If we are talking about the xlsx you can write a driver. The data format is nothing but an archived set of xml files. And search xml a realistic goal. If this is the old format it will be more difficult.
