Network Force/Torque Sensor System

Net F/T Installation and Operation Manual
Document: 9620-05-net ft-11
17. Advanced Topics
17.1 Improving Ethernet Throughput
In an optimum network setup, the Net F/T’s RDT data will arrive at the host computer with no loss of
data
If you observe lost data samples, you may do one or all of the following:
17.1.1 Direct Connection between Net F/T and Host
To achieve the best Ethernet performance (and avoiding the loss of data packages), we
recommend connecting the Net Box directly to the host computer. If you need to use a switch,
then try to use only one switch between sensor system and host. Avoid going through several
switches or going through a hub.
17.1.2 Choice of Operating System
The Windows operating system periodically performs housekeeping processes that can require
a significant amount of processing power over a short amount of time. During these intervals, a
loss of data can occur because Windows does not treat UDP data with a high enough priority.
If a loss of data is not acceptable for your application, then the use of a real-time operating
system is recommended.
17.1.3 Increasing Operating System Performance
The following items may also help you increase the performance of your computer system so it
can best respond to the Net F/T’s fast data rates:
Disable software firewall. One way to improve the Ethernet performance is not to have any
software firewall activated. In some cases, this may require help from IT personnel.
Disable file and printer sharing. The processes associated what file and printer sharing can
slow down an operating system’s response to Ethernet data and may lead to lost data.
Disable unnecessary network services. Unnecessary network services and protocols can slow
down an operating system’s response to Ethernet data and may lead to lost data. For the best
UDP performance, it may be necessary to turn off every network service except for TCP/IP.
Use an Ethernet traffic snooper. An Ethernet traffic snooper can be invaluable in detecting
that there are processes using up Ethernet bandwidth and potentially slowing down the
response of your computer’s operating system. This is an advanced technique that your IT
department may need to perform. The free software program Wireshark (www.wireshark.org)
is commonly used for this type of investigation.
Use a dedicated computer. A dedicated measurement computer isolated from the company
network will not be burdened by the company network processes.
Use the Net F/T’s multi-unit synchronization capability if there are multiple Net F/Ts on the
same network. This will eliminate data collisions from Net F/Ts transmitting at the same time.
17.1.4 Avoid Logging the Host to a Company Network
Being logged onto a network requires the periodic access to the Ethernet interface by processes
other than your measurement application. This can lead to loss of UDP packages.
17.1.5 Use a Dedicated Network
Placing the Net F/T on a dedicated Ethernet network with no other devices on the network,
other than the host computer, will remove data collisions and give the best network
performance.
Pinnacle Park • 1031 Goodworth Drive • Apex, NC 27539 USA • Tel: +1.919.772.0115 • Fax: +1.919.772.8259 • www.ati-ia.com • Email: info@ati-ia.com
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