This module allows the dimmer modules M012 and M028 to be controlled
with a direct currents or pulse-width controller
(e.g. from PCs). It will is connected to the modules instead of the
potentiometer Galvanic isolation control circuit via opto-couplers.
Control voltage: 1 - 5 VDC/3 - 12 VDC/6 - 24 VDC
Or TTL rectangular pulses 5V 1 - 10KHz
PWM pulse width 10 - 90%
