Digikeijs DR4088RB-CS 16-channel R-BUS™ feedback module 16 channel R-BUS™ feedback module suitable for the ROCO™ system. The DR4088RB is a feedback module designed for the Roco™ MultiZentrale-Pro™, Z21™ (black), z21™ (white) and is compatible with the Roco™ 10787. The DR4088RB is available in two versions: the OPTO and CS. The CS version has integrated current detection and can be connected directly to the rails. The DR4088RB-CS detects as little as 1mA current consumption on the rails and then sends a continuous occupied signal to the control unit.