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that are attached to each of the two ports. Refer to
Synchronization across a Network
details.
Note
The IEEE 802.1AS protocol is an IEEE 1588 profile, but is incompatible
with other IEEE 1588 profiles. When FieldDAQ devices are using the
IEEE 802.1AS protocol to synchronize they cannot synchronize with devices that
use other protocols or IEEE 1588 profiles and vice versa.
FieldDAQ MAC Addresses
The FieldDAQ device is associated with two MAC addresses—both of which are labeled on
the device—device and switch. These MAC addresses are not associated with a particular
Ethernet port, but both addresses can appear on both ports as necessary.
Table 11. NI MAX Device and Switch MAC Addresses
Device MAC Address
Switch MAC Address
Associated with the device’ IP
address
Associated with the internal Ethernet switch—not
associated with the device’s IP address
Used by normal device traffic
Used for Ethernet protocols for network configuration
and synchronization
Listed in MAX
Not listed in MAX
The switch MAC address is used to implement the following switch protocols:
•
IEEE 802.1AS-2011 (Precision Time Protocol)
•
IEEE 802.1Q (Rapid Spanning Tree Protocol [RSTP] implemented)
•
IEEE 1588 (Delay Request-Response Default Precision Time Protocol)
The switch MAC address only appears in packets exchanged between the switch embedded in
the FieldDAQ device and the next Ethernet device. It will not propagate further in a properly
configured network. For more information about the recommended configurations for
networking the FieldDAQ device, refer to
Topology Options
Recommended networking topologies are described in this section.
•
Host
—Can be a Windows computer or a real-time controller with the NI Linux
Real-Time operating system, such as the IC-317
x
, cRIO-9035/9039 Sync, cRIO-904
x
/
905
x
, or cDAQ-9132/9133/9134/9135/9136/9137 for LabVIEW Real-Time
•
Node
—Can be any FieldDAQ device or IEEE 802.1AS-compliant CompactDAQ chassis,
such as the cDAQ-9185/9189
For more information about designing Ethernet measurement systems, visit
and
enter
fdenet
.
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