ASRock B250 Pro4 User Manual - Page 29
Chassis Intrusion Header, Serial Port Header
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B250 Pro4 CPU Fan Connector (4-pin CPU_FAN1) (see p.7, No. 5) ATX Power Connector (24-pin ATXPWR1) (see p.7, No. 6) ATX 12V Power Connector (8-pin ATX12V1) (see p.7, No. 1) Serial Port Header (9-pin COM1) (see p.7, No. 23) FAN_VOLTAGE CPU_FAN_SPEED GND FAN_SPEED_CONTROL 1 2 3 4 This motherboard provides a 4-Pin CPU fan (Quiet Fan) connector. If you plan to connect a 3-Pin CPU fan, please connect it to Pin 1-3. 12 24 1 13 This motherboard provides a 24-pin ATX power connector. To use a 20-pin ATX power supply, please plug it along Pin 1 and Pin 13. 8 5 4 1 RRXD1 DDTR#1 DDSR#1 CCTS#1 1 RRI#1 RRTS#1 GND TTXD1 DDCD#1 This motherboard provides an 8-pin ATX 12V power connector. To use a 4-pin ATX power supply, please plug it along Pin 1 and Pin 5. This COM1 header supports a serial port module. Chassis Intrusion Header (2-pin CI1) (see p.7, No. 21) 1 GND Signal This motherboard supports CASE OPEN detection feature that detects if the chassis cove has been removed. This feature requires a chassis with chassis intrusion detection design. English 23