ethernet to rs 485 conversion protocol

[andheri]

dear sir

i am using labview DSC module for datalogging. Presently we are using rs232 to rs 485 converter to access the data from my instrument. Because my instrument is woking on RS 485 bus. Now i want to use ethernet protocol instead of rs232. for this we have already ethernet to rs485 converter. Now i want to know that what setting i have to do in opc server using modbus ethernet driver.

regards

falgandha

[Scott_G]

Hey Falgandha,

Which settings are you having trouble with?  Have you tried looking at the examples that are included with the Modbus Library?

[andheri]

hi

Please tell me which vi i have to use in modbus liabrary and what setting i have to do in that. Please give the setting in detail.

falgandha

[unclebump]

See this thread for a modbus serial read holding registers and an ethernet version.

http://forums.ni.com/ni/board/message?board.id=170&message.id=135288&view=by_date_ascending&page=2

I'm not sure why you need to use the modbus library vi's if you have an opc server and the DSC module. You should be using the read tag vi's to get data out of the DSC module. That way your labview code does not need to change if you convert your opc server communication from serial to ethernet. What version of labview DSC and which opc server are you using?? We also need to know what ethernet/rs485 converter you are using.

[andheri]

Dear sir,

i am able to make connection with my instrument using ethernet to rs 485 converter through virtual serial port manager.So my converter is having one ip address and i can access my instrument through this converter from any computer which is in same network. 

My question is that now i want to observe my instruments parameter from more than one computers using OPC server at the same time Is it possible? and yes please tell me how can i implement that.

Now i have tried this but i am getting my instruments parameters only in one computer at a time in opc servers.