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Hello,
I installed RapidSCADA yesterday and just started learning it. I have a slave device that works with Modbus RTU. Using this device, I measure temperature data from 4 NTC sensors. I configured the parameters in the Administrator application as described in the tutorial. At first, communication between my slave device and PC was successful.However, after the slave device was powered off and on again, I was no longer able to establish communication through the Administrator application. On the other hand, when I use Modbus test software, I can successfully communicate over the same COM port and the same USB channel.
Below, I share the Line State log. As you can see, after the message “Close serial port COM3”, the connection to COM3 cannot be opened again. Could you please tell me how to resolve this issue? Restarting the computer did not help.
Also, in the Instance Status section, while the Server shows as “Normal,” the Communicator gives an “Error.” Executing commands such as restart does not make any difference.
LINE LOG:
2025-08-25 14:51:06 Session with the device [1] NTC Daughter Board
Request element group “Temperature Meausement”
Send (8): 05 03 00 01 00 04 14 4D
Receive (2/2): 05 03
Receive (11/11): 08 FF EC FF EC FF EC FF EC D6 69
OK2025-08-25 14:51:06 Session with the device [1] NTC Daughter Board
Request element group “Temperature Meausement”
Send (8): 05 03 00 01 00 04 14 4D
Receive (2/2): 05 03
Receive (11/11): 08 FF EC FF EC FF EC FF EC D6 69
OK2025-08-25 14:51:06 Close serial port COM3
2025-08-25 14:51:06 Communication line [1] RTU 485 is stopped
LINE STATE:
[1] RTU 485
———–
Status : Terminated
Communication channel : COM3, closedShared Data (1)
—————
Modbus.Templates = Dictionary of 1 templatesDevices (1)
———–
[1] NTC Daughter Board : Undefined
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