The 83933-01 is a multi-zone hybrid multiplexer controller from Honeywell. It is programmed in the WIN-PAK software language and connects to a 4-20mA analog I/O card and up to 12 discrete inputs and outputs. It is designed for the management of multiplex-style control systems, with a modular design that allows for easy expansion and upgrade. Its features include self-adjustment, signal conditioning, diagnostic aids, a range of communication ports, PID loop control, and scalability. It is compatible with Honeywell panels such as the Expert Series, ID Series, Solus Series, and Ventilation Series.