Quality of communication is measured by the following formula:
Q = Q * qF + (1 - qF) * (1 - !Error)
where Error is a Boolean stating whether the driver reported an error
state, and the initial value of quality, Q, is defined as 1.
Each time a driver completes a read or write, a new value of the quality is calculated.
qF in this equation stands for QualityFactor and is set by this system variable.
Default: CommStatsQualityFactor = 99