The model SIU-2218 Serial Interface Unit (SIU) performs the interface between Serial Bus #1 of the Advanced Transportation Controller (ATC) and the Input Assembly, Output Assembly, and other devices in an ATC Cabinet. Its functions include controlling load switch outputs, detector resets, communicating with inductive loop detectors and other devices, and the conditioning and conversion of loop detector call inputs for the ATC.
The SIU-2218 meets all requirements of the ASHTO/ITE/NEMA Intelligent Transportation System (ITS) Standard Specification for Roadside Cabinets Version 01.02.17b, and is interchangeable with the SIU-218 except for the reduced faceplate width.
- SIU-2218: Serial Interface Unit (reduced width faceplate)
- SIU-218: Serial Interface Unit (double wide faceplate)