3-Series card interface is a compact, rack-mountable enclosure designed to provide versatile control interface and expansion solution using any single 3-Series control card. It is used to expand the control ports of 3-Series Control System. It can be installed with the control system at the central equipment cabinet or located remotely near the devices under control. It interfaces with the control system via Ethernet and can be powered via PoE or dedicated 24V power pack. The CEN-CI3-1 accepts one 3-Series control card (sold separately). Control cards are available to support bidirectional RS-232, 422, or 485, IR or 1-way serial, 0 to 10V analog inputs, digital logic inputs or outputs and low-voltage relay outputs.