Microplex:

Negative going pulses (reset and clock need to be at least -2v and not more than -12v.
Positive pulses (dimmer levels) should go between 0 and +10v (ok to go as high a +13v).

The length of the reset pulse needs to be at least 2 msec.
Analog (dimmer levels) pulses should be at least 150 usec.
Clock pulses should be at least 100 usec.
The maximum number of dimmers that can be sent is 128.
The minimum is 1.
Extending reset, analog, and clock pulses excessively beyond minimum times
can result in stepping and drifting as packet times increase reducing refresh rates.
In general, it is a good idea to not let a packet time extend beyond 25 - 30 msec.
You will start to see stepping beyond that.