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The following are general requirements for implementing a 2-station Ethernet LAN-based RDA setup:
You can also network both computers to perform remote data acquisition through a hub or by using a crossover Ethernet cable. However, these two methods are beyond the scope of this application note, as it focuses only on the Internet connection because it is the most widely used. Your network administrator can help you configure your computers in either of these ways.
Note: If this step fails, check with your network administrator. The remote device may be behind a firewall, so you will need to ask the network administrator how to access it.
The following benchmark tests were performed to demonstrate the RDA feature provided by NI-DAQ 6.9.2 under LabVIEW 6.1. For performing these tests, the following hardware was used:
Demo server: 1 Dell GX150, 1 PCI-MIO-16E-4
The results from these benchmark tests may vary depending upon the computer and the DAQ devices used, the number of applications running during the acquisition on both the remote and client computers, and the data processing performed by each application.
Use Cont Acq&Chart(buffered).vi to scan channel 1 of the RDA Server. The results were max scan rate = 220 kS/s, with a buffer of 50 kS, reading 10 kS at a time.
Use Cont Acq&Chart(buffered).vi to scan channels 1 and 2 of the RDA Server. The results were max scan rate = 130 kS/s, with a buffer of 50 kS, reading 10 kS at a time.
Use Cont Acq&Chart(buffered).vi – modified for two devices – to scan channels 1, and 2 of the RDA Server and channel 1 of RDA Client. AT the server, the results were max scan rate = 70 kS/s, with a buffer of 50 kS, reading 10 kS at a time. At the client, the results were max scan rate = 120 kS/s, with a buffer of 50 kS, reading 10 kS at a time.
The figure below shows how VI Logger can be used with RDA.
The RDA feature of Traditional NI-DAQ (Legacy) is very useful in situations when a computer with a DAQ device is placed in a harsh environment where controlling or monitoring a process is necessary. Furthermore, this feature can be used to enable a central computer to acquire all of the data from several machines and then process or store that data.
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