User manual

25 Chapter 4
4.2 Alarm Board Specifications
Input Power: +5V, +12V
Input Signals:
• 7 “fan” connectors
• One “thermal sensor” connector (supports up to 8 thermal sensors
connected in a series)
• One “power good” input
• One “alarm reset” input
• One “voltage signal” connector (connected from the motherboard,
and supports six voltages: +- 12V, +- 5V, +3.3V, +5Vsb)
• One “hard disk LED” connector (connected from the motherboard)
Output Signals:
• One “LED board” connector
• One “buzzer” output
4.2.1 Connectors & Pin Definition
Table 4.1: CN1, Auxiliary external power connector, standard mini 4-
Pin power connector
Pin 1 +12V Pin 3 GND
Pin 2 GND Pin 4 +5V
Table 4.2: CN4, Thermal sensor (LM75) connector
Pin 1 +5V Pin 3 T_SDAT
Pin 2 T_SCLK Pin 4 GND