Yeah,it's still me who wanna to communicate between LV and NEC based on Modbus Protocol.
At the help of NI engineer,i download the Modbus Library from the forums and try to use it to make the communication work.
Now the new questions occurs on me.As we known,the modbus protocol is consisted of the start bite、the slave address、the function code、the dates、the CRC/LRC and the stop bite.All the parameters are in the library except the function code.The library deal the function code with poly-VIs.And not only the PC,but the NEC just recognize the messages based on Modbus Protocol.
So i don't know how to do.Any advise is appreciate.
