The MBIT-100 provides limit comparison and absolute value testing of up to 64 PCM parameters in a MEDAU/MCDAU-20XX data acquisition system. It also provides 10 output bits for transmitter setup. Testing includes two’s complement data. The failure of any parameter can be monitored at any or all of the 8 programmable Flag outputs. Flags 1-4 are also driven out using Opto-Isolators.