SL1500-PU2 Rooftop Machine Controller summed up the company's many years of cabinet control experience, and has a better performance in anti-interference. All ports of the complete controller have passed stricter EMC tests: electric fast pulse 4kV, surge 4kV, conduction resistance Interference 150K80M, with SL108 handheld communicator, the man-machine interface is more user-friendly.