Relay output is used for the computer panel, medial relay is not necessary, reduced malfunctions and make maintain and inspecting convenient...

电脑板采用继电器输出，无需中间继断器减少了故障点，维修检测方便。

youdao

youdao

youdao

At the Nasdaq OMX Group, a single technician sits in front of eight flat-panel computer screens in a quiet operations center, 51 stories above the World Trade Center construction site.

FORBES: About Robert Greifeld

Feet on the brakes, I followed John's instructions to bring the power up to takeoff level, my cue being a computer display on the panel.

FORBES: Jet Pilot for a Day

The technology works by placing a thin acrylic panel over the computer display.

BBC: PC screen turns into speaker