I am using the PXI 8431/2 to read out data from the PDS ELITE flowmeter (Modbus RTU). For receiving data, the RS485 protocol asks for pin 4 and 5, but this configuration does not seem to work. When I connect the RS-485 to USB converter from Microflex I do receive the data properly, so somehow between the pin lay out and the PXI there is this problem.
Can somebody help me out?
Solved! Go to Solution.
I think what Hossein was trying to send you is this:
Can you also tell me a bit more what you are using to read the data? What environment. Do you have 2 wire or 4 wire Modbus RTU?
thank you very much! As I followed the link, we have shortcutted pin 4 with 8 and 5 with 9. Setting the it to half-duplex, the transmitter and receiver data can now go through the 2 wire cable.