Works out of the box, no configuration required. Used on remote LED time display for model aircraft competitions.

I have tested this product for two weeks and works perfectly. RS485 to BACnet Controllers.
This company has very good Tech support as well.

I have tested and had customers use these modems in the monitoring of our solar PV monitoring system. We use RS-485 to communicate to the Data Logger and sometimes wiring that into an existing building is nearly impossible. Using these modems it is as simple as setting them up and plugging in the wires. I have used them in commercial buildings where they had to communicate 120 ft. from the array through the ceiling with aluminum backed insulation and through 8" concrete walls and they worked perfectly. Customers have used them on ground mounts and out buildings to get the monitoring to the main building and again had no problems. Just remember that you need to get the programming cable and set them up.