Overview 
 The product according to the standard GB3836-2000, MT 209-90, MT 210-90 design and manufacture of relevant content. The product gas and coal dust in a coal mine explosion hazard environments, it is proof technology and the screen will split into one cloud mirror control technology to meet explosion-proof front of the cloud region to achieve the mirror control, split screen switching the actual needs. 
 1. Equipment, use of environmental conditions: 
 ? ambient temperature 0 ~ +40 ℃; 
 ? relative humidity ≤ 95% (+25 ℃); 
 ? atmospheric pressure 80 ~ 106kPa; 
 ? no significant vibration and impact areas; 
 ? gas and coal dust explosion hazard with the coal mine. 
 2 Features 
 ? the four way video signal into video signal output. 
 ? control: instead of using the magnetic pen button operation to achieve operating four video input signals to switch to full screen video of any of four all the way, can also be a four way split screen also shows four video; can control KBA168 Mine Integrated Camera Flameproof about turning up and down, zoom lens and windshield wipers stopped opening. 

 3 Specifications 
 1 power supply 
 Operating voltage: AC127V; 
 Input apparent power: 30 VA. 
 2 proof mark: Exd Ⅰ 
 3 communication signal (with KBA168 Flameproof Camera integrated communications) 
 Approach: 1 Way 
 Communication: RS485 
 Baud rate: 2400 bps 
 Communication signal voltage peak - peak: 2 ~ 10V 
 Transmission Distance: 1km (with MHYVRP communications cables, cross-sectional area of ??1.5 mm 2) 
 4 video inputs 
 4 channel video input, video signal peak: 1V (positive polarity, the whole television signal, 75Ω unbalanced load) 
 5 video signal output 
 1 channel video output, peak to peak video signal: 1V (positive polarity, the whole television signal, 75Ω unbalanced load) 
 Video signal values: 0.7 ± 0.2V 
 Sync signal values: 0.3 ± 0.1V 
 6 Overall dimensions (L × W × H): 300 mm × 170 mm × 256 mm, shown in Figure 3-1;