Abstract: This metric is the ratio of the maintenance personnel who are actively doing the maintenance work (direct) to the maintenance personnel supporting the maintenance work (indirect). Direct personnel include those workers in the maintenance department that repair, maintain, modify or calibrate equipment.
MIDI (Musical Instrument Digital Interface) is a protocol designed for recording and playing back music on digital synthesizers that is supported by many makes of personal computer sound cards. Originally intended to control one keyboard from another, it was quickly adopted for the personal computer.
The MIDI interface The MIDI interface has three ports. MIDI: IN, OUT and THRU. The IN port allows data to be received by the machine. The OUT port is used for transmitting data. The THRU port creates a replica of the input signal. This is used to connect more than one MIDI device. At first glance it may seem unnecessary to have the THRU port, since you could simply chain devices together using the output from the OUT port.