The MMU-16E series Malfunction Management Units (MMU) exceed all the requirements set forth in the NEMA Standard TS2-2003 , Part 4. These units are intended to provide basic conflict and voltage monitoring for NEMA TS-2 traffic controller assemblies while maintaining downward compatibility with NEMA TS-1 assemblies. 

• MMU-16E: 12/16 channel with EIA-232 Port