The V450 is a VME 16-channel isolated analog-to-digital converter module which can acquire a wide range of DC voltages, including thermocouple temperatures. Each channel is independent with an isolated DC power supply, optoisolated interface, A/D converter, signal conditioning, input protection circuits, and test relay.

An internal microprocessor manages all data I/O and communicates with the VME bus via a transparent, VMEbus-speed dual-port memory.

Each channel may be user programmed to operate in voltage-input or thermocouple acquisition mode. In each mode, channel operating parameters, acquired measurements, and status flags are accessible in dedicated VME registers. Data rate/filtering options are provided. Data acquisition is managed autonomously by the processor, so VME masters may set channel parameters or read acquired measurements at any time at full VMEbus speed. Any channel can be associated with any of the reference junction sensors located in the external field-wiring termination panels, or can use the on-board sensor. Cold-junction compensation is via table lookup of thermocouple potential for the type currently selected. Reference junction temperatures are readable.