Product Review The OC1 advanced access control interface is not an RFID reader, but provides an OSDP Secure communications link to a compatible Third Millennium OSDP reader. The OC1 (and OSDP compatible reader) reuse existing reader cabling to minimise installation cost, and will eliminate the security vulnerability of the traditional Wiegand interface between an access control reader and the control panel. Mounted close to the control panel, the OC1 provides a compatible Wiegand output to allow the security of an access control system to be upgraded cost-effectively. The integrated RGB LED provides a visual indication of the state of the link between the OC1 and the reader. Interfacing The OC1 communicates using OSDP Secure to the reader over an existing reader cable, and outputs the card data to an access control panel. In addition to the Wiegand output from the OC1, a flexible interface is also provided to control the LED and buzzer at the reader.