Advantech DVMB-554E - Manual (Page 33)

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2.8.3 Reset Connector (CNX1-18)
Many computer cases offer the convenience of a reset button. Connect the wire
from the reset button
2.8.4 HDD LED Connector (CNX1-19)
You can connect an LED to this connector to indicate when the HDD is active.
2.8.5 ATX Soft Power Switch (CNX1-21)
If your computer case is equipped with an ATX power supply, you should
connect the power on/off button on your computer case to this connector. This
connection enables you to turn your computer on and off.
2.8.6 SM Bus Connector (CNX1-29)
This connector is reserved for Advantech's SNMP-1000 HTTP/SNMP
Remote System Manager. The SNMP-1000 allows users to monitor the
internal voltages, temperature and fans from a remote computer through an
Ethernet network.
CN29 can be connected to CN19 of SNMP-1000. Please be careful about the
pin assignments, pin 1 must be connected to pin 1 and pin 2 to pin 2 on both
ends of cable.