i have developed a tool using visual studio 2005 edition using c#. The tool retrieves the communication parameters in a modbus network as well as the slave id. but i have to detect the duplicate id in the network....please help.

 

Hello,

If you have duplicated Modbus RTU slaves you should first find addresses from there is no valid response (you can use modbus scanner from www.modbus.pl).

Then connect logic analyzer to the serial port TX/RX lines and send frames from master to the slaves with no response.
If there are slaves with the same ID you should get response which is not valid RS communication.

Regards
Andrzej