8433/4 not communicating in 2-wire auto mode in MAX or labview

All,

We're using 8433/4 PXI card to communication to a micro motion 7828 density transmitter. The NI-Serial RT software installed on the PXI and laptop is 3.3.0. The transmitter requires a 2-wire 485 setup.

I was able to communicate with the transmitter in MAX using a USB serial port on my laptop. I used a serial to rs485 2-wire converter. When I attempt to communicate using the PXI 8433 card in MAX I get no response.

Do I need more up-to-date serial rt software? or is there something else I'm overlooking in my setup?

Thanks

DB