Echelon LonWorks USB Network Interface - Manual (Page 15)

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USB Network Interface User’s Guide 9
3. Select the USB interface you want to configure and then click
Properties. This opens the dialog shown in Figure 2.2.
Figure 2.2 Properties Dialog
4. The Transceiver Type field only applies to U20 interfaces. Select PL-
20C if you must comply with the European CENELEC EN50065-1
regulations. Select PL-20N if you do not need to comply with these
regulations. PL-20N channels offer slightly higher message
throughputs than PL-20C channels, so normally you would use PL-
20N if you can do so.
Most users do not need to change the Neuron
®
processor’s buffer sizes
and counts from their defaults, as these defaults comply with
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International’s interoperability guidelines. However, if
the devices on your network require larger message and buffer sizes,
you might want to change the interface buffer sizes and counts.
To do so, use the Application Buffers and Network Buffers boxes to
set the number and size of the input, output and priority buffers on
the USB interface.
The total buffer memory allocation and the buffer memory available
will be displayed on the dialog as you configure these settings. If you
choose a configuration that exceeds the available buffer memory, a
warning icon will appear. The dialog will not allow you to allocate in
excess of the available buffer memory. You can click Restore
Defaults at any time to return to the default buffer configuration.