Asus H81M-V3 User Guide - Page 30
H81M-V3 Chassis intrusion connector
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+5V SPDIFOUT GND 11. Digital audio connector (4-1 pin SPDIF_OUT) This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port. SPDIF_OUT H81M-V3 H81M-V3 Digital audio connector The S/PDIF module is purchased separately. 12. Chassis intrusion connector (4-1 pin CHASSIS) This connector is for a chassis-mounted intrusion detection sensor or switch. Connect one end of the chassis intrusion sensor or switch cable to this connector. The chassis intrusion sensor or switch sends a high-level signal to this connector when a chassis component is removed or replaced. The signal is then generated as a chassis intrusion event. By default, the pin labeled "Chassis Signal" and "Ground" are shorted with a jumper cap. Remove the jumper caps only when you intend to use the chassis intrusion detection feature. CHASSIS H81M-V3 PIN 1 H81M-V3 Chassis intrusion connector +5VSB_MB Chassis Signal GND 1-22 Chapter 1: Product introduction