Power Switch Press to power-on or power-off the panel PC.Panel Backlight Control ButtonsBacklight On/Off Press to turn-on or turn-off the displayIncrease Brightness Press to increase brightness of the screen.Decrease Brightness Press to decrease brightness of the screen.8 brightness level available: 30%, 40%, 50%, 60%, 70%, 80%, 90%and 100%Rear BottomLine-in Used to connect an audio device as sound source.Mic-in Used to connect an external microphone.Line-out Used to connect a headphone or a speaker.LAN 1 and LAN 2 Used to connect the system to a local areanetwork. LAN1 supports Wake up on LAN.USB Used to connect USB 2.0/1.1 devices.COM 1 and COM 2 These COM ports support RS232/422/485compatible series device by BIOS setting.AcuPanel 17 has 2.5kV isolated protection.PS/2 KB/MS Used to connect a PS/2 keyboard and a PS/2 mouseReset Button Press this button to restart the system.VGA Used to connect an analog VGA monitor.12V-30V DC Input Used to plug a DC power cord.Rear (AcuPanel17)DIO (Optional)The digital I/O connector support 4 isolated protection digital inputchannels and 4 isolated protection digital output channels.Isolation voltage: 2500 VDCDI: 4x Digital Input (Source Type)- Input Voltage (Dry Contact) Logic 0: Close to GND ; Logic 1: Open- Input Voltage (Wet Contact) Logic 0: 3V max. Logic 1: +5V-+30VDC4x Digital Output (Sink Type)- Output Voltage: Typical 24VDC, 30VDC max.Logic 0: 0-0.6VDC Logic 1: 3.6-5VDC- Sink Current: 200mA max. per channelGPIO (Optional)The GPIO connector supports 2 digital input and 2 digital output.COM3 and COM4 (Optional)These COM ports support RS232 compatible serial devices.5 6