Digital display controller through PWM control to achieve accurate adjustment of light source brightness, each channel can be adjusted separately, with digital display, simple structure, easy operation, compatible with serial communication, network port communication and trigger function, with DIN rail clip installation and screw fixing; With power failure, overload protection function; External trigger high and low levels can be switched. Application: need to communicate with PC through RS232 or network port; DC24V controlled brightness light source; 1-4 light sources are controlled respectively.