ASRock C621A WS Quick Installation Guide - Page 34

Serial ATA3 DOM Connectors (SATA_4) (see p.1, No. 18) (SATA_5) (see p.1, No. 16) Serial ATA3 Connectors Vertical: (SATA_4) (see p.1, No. 18) (SATA_5) (see p.1, No. 16) Serial Port Header (9-pin COM1) (see p.1, No. 44) Clear CMOS Pad (CLRMOS1) (see p.1, No. 58) Non Maskable Interrupt Button Header (NMI_BTN2) (see p.1, No. 46) SATA_5 SATA_4 The SATA3 DOM connectors support both SATA DOMs (Disk-On-Module) and SATA data cables for internal storage devices. SATA_5 SATA_4 DDCD#1 TTXD1 GND RRTS#1 RRI#1 1 CCTS#1 DDSR#1 DDTR#1 RRXD1 These two SATA3 connectors support SATA data cables for internal storage devices with up to 6.0 Gb/s data transfer rate. *2 Type-C USB headers (USB31_TC1/ USB31_TC2) are shared with 2 SATA 7-pin headers (SSATA_2/SSATA_3) (BOM option). This COM header supports a serial port module. This allows you to clear the data in CMOS. To clear CMOS, take out the CMOS battery and short the Clear CMOS Pad. GND 1 CONTROL Please connect a NMI device to this header. English 32