The biCoders are the only true bi-directional two-wire devices in the industry because Baseline’s biCoders not only receive commands from the controller, they also send real-time information back to the controller. Plus, the biCoders have built-in diagnostic LED lights that tell you at a glance whether the device is working. This smart technology also enables you to assign any biCoder to a zone or function from the controller after the biCoder has been installed in the field.