The Universal Process Interface Unit (UPIU) is Honeywell's latest upgrade for installation in existing High Level PIU (HLPIU), Low Level PIU (LLPIU), and Low Energy PIU (LEPIU) Data Hiway boxes on TDC 2000/3000 systems. The new UPIU can replace previously installed HLPIU, LLPIU, and LEPIU electronics or can be used in new installations.

• The UPIU replaces the existing CPU and ROM/RAM card in all three PIU types :

HLPIU, LLPIU, and LEPIU.

• The single new PWA replaces the PIU PWAs by selecting the appropriate PIU personality via jumper settings.