User manual

SNMP-1000-B2 User Manual 12
2.2.16 Chassis and Watchdog Timer Connector (CN20)
Pins 1 and 2 of CN20 are connected to the ATX power ON/OFF button on the chas-
sis.
Pins 3 and 4 of CN20 are connected to the SNMP-1000-B2 chassis reset button.
Pins 5 and 6 of CN20 are connected to the watchdog timer output pins of the CPU
card (J2). SNMP-1000-B2 can detect a watchdog timer time-out output signal.
Included with the product is a cable (part number 1703020558) for connecting
SNMP-1000-B2 to the watchdog timer.
Figure 2.6 Configuring the watchdog timer to interrupt
Figure 2.7 Configuring the watchdog timer to reset
2.2.17 Power Good Input Connectors (CN16, CN21 ~ CN24)
Up to four power fail signals can be detected. SNMP-1000-B2 can detect “power
good” and “power fail” signals if the power supply unit emits these output signals.
2.2.18 External HDD LED Connector (CN26)
Output HDD LED signal to chassis bezel.
2.2.19 Fan Connectors (FAN1 ~ FAN9)
These connectors provide +12 V power to fans and receive tachometer signals from
the fans. SNMP-1000-B2 can only detect fans that emit tachometer signals. This type
of fan generates two pulses per revolution.
2.2.20 External Backup Battery Connector (BT1)
SNMP-1000-B2 supports an external backup battery to maintain alarm notifications
during total system power failures.