Product description 

1Host by output and entered two part composition, are pulse from output part of "way high pressure output end" to fence Shang, then returned to received part of "way high pressure entered end"; negative pulse from output part of "II road high pressure output end" to fence Shang, then returned to received part of "II road high pressure entered end", to in front-end fence Shang formed are, and negative two a pulse loop. 

2Strong ground output: grounding and surge arrester shared ground output, and needed separate protective earthing grounding.