MDT-01 and MDT-02 support all of ProductionACE's software functionality except they can only collect two downtime causes. If you do not need operator interface/data entry, these units are the most economical ways to connect to your shop floor. The difference between units: MDT-01 requires continous power at the machine, MDT-02 obtains power from a VT-28 communications interface at a PC. MDT-01 has an output to activate a user-supplied solid state relay to alert when 1) machine is down, or, 2) machine is slow, or, 3) at batch count. The MDT-02 has no output