ASRock Z390 Steel Legend Quick Installation Guide - Page 27
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Z390 Steel Legend Addressable LED Header (3-pin ADDR_LED1) (see p.1, No. 24) Serial Port Header (9-pin COM1) (see p.1, No. 25) 1 GND DO_ADDR VOUT This header is used to connect Addressable LED extension cable which allows users to choose from various LED lighting effects. Caution: Never install the Addressable LED cable in the wrong orientation; otherwise, the cable may be damaged. * Please refer to page 40 for further instructions on this header. RRXD1 DDTR#1 DDSR#1 CCTS#1 1 RRI#1 RRTS#1 GND TTXD1 DDCD#1 This COM1 header supports a serial port module. 2.7 Post Status Checker Post Status Checker (PSC) diagnoses the computer when users power on the machine. It emits a red light to indicate whether the CPU, memory, VGA or storage is dysfunctional. The lights go off if the four mentioned above are functioning normally. English 25