How can I connect the NI USB RS485 interface to an instrument with two wires?

I am connecting the RS485 to a Dynisco UPR 700, but labview alway tell me that " Before the operation is completed, timeout expired", I donot know what is wrong. Thanks!

That message indicates that a read timeout occured. This usually suggests either a cabling problem (the RS-485 pin-out is in the NI-Serial manual pdf), a port settings problem (baud rate, etc.), a COM port number problem (using COM3 instead of COM4, etc.), or a communication protocol problem (incorrect command sent to the device, etc.). I suggest double checking your cabling and port settings, then run your vi with NI-SPY open to see what type of port activity is occuring.

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