Chapter 3 Connector and LED Information
© National Instruments Corporation 3-7 M Series User Manual
+5 V Power Source
The +5 V terminals on the I/O connector supply +5 V referenced to
D GND. Use these terminals to power external circuitry. A self-resetting
fuse protects the supply from overcurrent conditions. The fuse resets
automatically within a few seconds after the overcurrent condition is
removed.
Caution Never connect the +5 V power terminals to analog or digital ground or to any
other voltage source on the M Series device or any other device. Doing so can damage the
device and the computer. NI is not liable for damage resulting from such a connection.
The power rating on most devices is +4.75 to +5.25 VDC at 1 A.
Refer to the specifications document for your device to obtain the device
power rating.
Note (NI PCIe-625x Devices Only) M Series PCI Express devices supply less than 1 A of
+5 V power unless you use the disk drive power connector.
Note The NI 6221 (37-pin) device does not have a +5 V terminal.
USB Chassis Ground
For EMC compliance, the chassis of the USB M Series device must be
connected to earth ground through the chassis ground.
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