[Thov]

Alright, it seems things have been solved:

I used your linked site and input the request first from Rapid Scada (00 01 00 01 00 10 6D D7) and got this:
00 Slave address 0x00 (0)
01 Function code 0x01 (1) – Read Coils
00 01 Starting address Physical: 0x0001 (1)
Logical: 0x0002 (2)
00 10 Quantity 0x0010 (16)
6D D7 CRC 0x6DD7 (28119)

Then I did the same for a working coil request from Simply Modbus Master (01 01 00 00 00 10 3D C6) and got this:
01 Slave address 0x01 (1)
01 Function code 0x01 (1) – Read Coils
00 00 Starting address Physical: 0x0000 (0)
Logical: 0x0001 (1)
00 10 Quantity 0x0010 (16)
3D C6 CRC 0x3DC6 (15814)

So the slave address was mismatching. I then went to Configurator Database -> Devices and set the address of the masterboard to 1:
https://imgur.com/gallery/p35RlR9

I then reuploaded, and got successful data from masterboard (device nr. 1)!
https://imgur.com/gallery/IYeezme

Then I did the same as the previous step for the other two devices (device nr. 2 and 3), i.e. Configurator Database -> Devices and set their addresses to 1 as well. BUT: I left their Call numbers as 127.0.0.1. Remember that I set the Call number for device nr. 1 to blank as per your request at 2:06pm.

Then I set them to be active again in Instances -> Default -> Communicator -> Communication lines -> Line 1 parameters:
https://imgur.com/gallery/Rw9A1qP

Then I reuploaded, and now I have all data coming from my devices, so we’re back in business 🙂

For the record, I don’t yet know precisely what I did wrong the first time or why it did not work, but I see that the addresses need to match, obviously – you probably have a better idea about why.

[Thov]

Done, but no change. The device still outputs that it receives the requests from Rapid Scada as before.
Line 1 parameters:
https://imgur.com/gallery/lpEA0kS

Devices:
https://imgur.com/gallery/dBnIxdR

Line 1 stats:
https://imgur.com/gallery/ilVwN3u

[Thov]

Hi,

I hope these are the device properties you requested:
https://imgur.com/gallery/pxFga5t

I use Modbus RTU via COM-port.

[Thov]

I can also add that the device debugger prints request info when Rapid Scada requests data from it, as seen in the lines “RegCoilCB rd: 1, N …” :
https://imgur.com/gallery/YM63sYi

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