3No. Component Name Note1 IndicatorFrom left to right:POWER indicator(1) Red light on, power normal. Light off, device power off.RUN indicator(1) Green light on, means switch operation normal. Light NO or OFF, means witch abnormal.Status indicator connecting VTH(6) Green light flash , connected VTH networknormal. Light NO or OFF, means connected switchabnormal or VTH network abnormal.Switch upper IN indicator(1) Green light flash, means upper switchconnected. Light NO or OFF, means connected upper switchabnormal.Switch lower port OUT indicator(1) Green light flash, means connected lowerswitch. Light NO or OFF, means connected lower switchabnormal.2 Upper Port IN Switch cascade upper port.3 Lower Port OUT Switch cascade lower port.4 Network PortTo guarantee best network connection, when multiswitch cascade, you just need to connect level 1 switchnetwork.5 OFF/ON Power switch.6 DC IN Power Plug DC 24V power input.7 VTH Port 1~6 Connect digital VTH (6).Chart 2-12.2RearDevice rear structure is in Figure 2-2 and see Chart 2-2.