Supermicro SuperWorkstation SYS-531R-I User Manual page 44

Power LED
The Power LED connection is located on pins 15 and 16 of JF1. Refer to the table below
for pin definitions.
NMI Button
The non-maskable interrupt (NMI) button header is located on pins 19 and 20 of JF1. Refer
to the table below for pin definitions.
Chapter 4: Motherboard Connections
Power LED
Pin Definitions (JF1)
Pin# Definition
15 3.3 V
16 PWR LED
NMI Button
Pin Definitions (JF1)
Pin# Definition
19 Control
20 GND
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