Campbell Scientific NL240 Wireless Network Link Interface - Manual (Page 55)

Appendix C. NL240 Settings
Ad hoc Channel must also be specified. Choose a channel that is different
from any surrounding wireless networks to minimize interference.
SSID (Service Set Identifier)
The SSID is the name that identifies a wireless network (32 character
maximum). The SSID differentiates one wireless network from another, so all
devices attempting to connect to the same network must use the same SSID. If
the NL240 is configured to “Join an Existing Network”, then enter the SSID of
the network to join here. If no SSID is specified, the NL240 will join the
strongest open network it finds. If the NL240 is configured to “Create an Ad
hoc Network”, then the SSID entered here will be the SSID of the network
created.
To see a list of the available networks detected in the area, click on the browse
button or view the “Wireless Networks in Area” list on the Wi-Fi tab in the
Settings Editor.
When the browse button is clicked or the Refresh button inside the
resulting dialog is clicked, if the device is currently connected to
a network, the connection will be temporarily interrupted. The
device will disconnect, scan for available networks, then
reconnect.
Key/Passphrase
If joining a WPA or WPA2 security enabled network, then this is where the
PSK (Pre-Shared Key) is entered. If joining a WEP security enabled network
or creating an ad hoc network using WEP security, this is where the WEP key
is entered. The device supports 64-bit WEP and 128-bit WEP. For 64-bit
WEP, enter a in the form of 5 ASCII characters or 10 hexadecimal digits (0-9,
A-F). For 128-bit WEP, enter a key in the form of 13 ASCII characters or 26
hexadecimal digits (0-9, A-F).
Ad hoc Channel
Applicable only when the device is configured to create an Ad hoc network. It
specifies in which channel the network should be created. Two Wi-Fi
networks operating on the same channel will interfere with each other and will
have to compete for bandwidth. The center frequencies of adjacent channels
are 5 MHz apart and the bandwidth of each channel is 20 MHz which means
that adjacent channels overlap. To completely avoid interference, there must
be a spacing of at least 5 channels between each Wi-Fi network. It is,
therefore, recommended to use channels 1, 6, and 11. To see a list of all the
wireless networks in the area and the associated channels on which they
operate, go to the Settings Editor tab then Wi-Fi tab and see the Wireless
Networks list.
Power Level
This fixes the Transmit Power level of the module. This value can be set as
follows: Low (7dBm), Medium (10dBm), High (16 to 17dBm).
NOTE
C-5