Serial Port on Imac

I have Bought a USB A/D converter and now I like it to connect it.

I used the Xojo example “Serial Post Barcode Reader”.

I have the possibility to connect the USB Port with the name: “usbmodem012951”
But after connection there is nothing happen.

The A/D convertor has 4 digital in and outputs, 16 Analog inputs and 1 Analog output.
At the convertor I have connected a test board with switches, poti’s and some LED’s.

I have added by the SerialController, under DataAvailable, the next Command.

A/D Coverter: USB-AD from bmcm
Test Board: ZU-DBD from bmcm

How can I become the Data from this unit?