This set of RS485 Converters permits to extend the length of the data cable between a SFAS, MFAS or XFAS system and the user PC. With RS485 Converters the cable length may be extended to 100m (typical) up to 1 200m (maximum). One converter is connected directly to the Sodar Processing Unit. It is powered by the Sodar Processing Unit. The other converter is connected to the user PC and powered by a power supply. The data cable is not included in this set and needs to be ordered separately.