Weidmuller WI-MOD-945-E: 900Mhz Wireless Ethernet & Device Server v2.16 - Manual (Page 37)

Weidmuller Wireless Ethernet Modem & Device Server WI-MOD-945-E User Manual
Page 37 www.weidmuller.com Rev 2.136
The WI-MOD-945-E can be configured for different radio transmission rates. A reduction in rate increases the reliable
range (transmission distance). The factory-default data rate settings are suitable for the majority of applications and
should only be modified by experienced users.
The WI-MOD-945-E allows for a configurable fixed rate or an Auto radio transmission rate. When a fixed rate is configured
the radio transmission rate is never altered, even under extremely poor conditions. The Auto rate will automatically
change the radio data rate to give the best throughput. When a radio transmission is unsuccessful the WI-MOD-945-E will
automatically drop to the next lowest data rate and if subsequent transmissions are successful at the lower rate, the WI-
MOD-945-E will attempt to increase to the next highest rate. When a station connects to an access point the two devices
negotiate a data rate based which is within configured range of radio data rates for both devices.
Select the “Radio” Menu to change the following configuration parameters. If a change is made, you need to select “Save
Changes
” to retain the changes. Changes will not take effect until the unit is reset.
Radio Mode WI-MOD-945-E only supports the 802.11 standard.
Transmit Power Level This allows adjustment of the radio power. Do not set the radio power above the
allowed setting for your country You can reduce the power for short range
applications, or to allow the use of high gain transmitter antennas while still
complying with the emission requirements of your country.
See Appendix C - ” for dBm to mW conversion
Channel (AP Only) Select available channel, frequency and bandwidth from drop down list.
Different Regions will show the channels available for that region.
Channel Width Used when configuring Clients (STA). A Client will scan for available AP’s that it
can then connect with. Selecting a Channel Width will limit the number of
channels the Client will scan, i.e. if 5MHz is selected then the Client will only
scan the 5MHz channels, If Auto is selected then it will scan all channels and all
bands (Default is Auto)
Transmit Data Rate The radio baud rate in Mega (million) bits per second (Mbps) for point to point
radio transmissions. The default value is Auto. Select a fixed rate to force the
radio to use the selected rate. Note: Fixing the TX Rate is not recommended
except for advanced users.
The Transmit Data Rate only applies to the Transmit messages as the radio can
receive on all data rates
Note: Increasing the Transmit Data rate will decrease the Transmit power level
i.e. 36Mbps data rate will reduce the TX power to 400mW, 48Mbps will reduce
the power to 200mW, and 54 Mbps will reduce the power to 125mW.
Basic Rate This is the default data rate that the AP uses when sending beacons,
management frames, and all broadcast / multicast frames
Beacon Interval (AP
only) This interval is the period between beacon transmissions sent by an Access
Point. The default value is 100 milliseconds, and it may be adjusted from 50 to
4095 milliseconds.
Max Distance Configure the maximum distance the radio signal is expected to travel. This
allows the modem to compensate for the flight time of messages as they pass
from the transmitter to the receiver, and as the acknowledgement messages are
returned. Setting this value larger will cause a small reduction in throughput.
Setting this value too small will cause communications problems over longer
distances. Default distance is 20km
Disable SSID
broadcast. (AP only) This should be used to prevent unwanted eavesdroppers from detecting the
radio network System Address (SSID) by passively listening to beacon
transmissions from the Access Point. When disabled, Access Points will not
transmit the System Address openly in Beacon messages. This is particularly