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The NUUO SCB-C28 provides with 4 optical isolated digital input channels and 4 power relays output. This surveillance IO device is typically used to integrate burglar alarm input and output devices to a NUUO video surveillance system. All channels use screw terminals for convenient connection of field signals. Each channel also has LEDs to indicate channel status. The NUUO SCB-C28 outputs to RS-485 and can be connected to a NUUO PC based DVR via a NUUO SCB-C08 (which converts the RS-485 to USB).