Weidmuller Wireless Ethernet Modem and Device Server User Manual
19
Rev Version 1.1
•
Device mode: Bridge
•
IP address: 192.168.0.1XX, where
“XX” is the last two digits of the serial number (the default IP address is
shown on the printed label on the back of the module)
•
Netmask: 255.255.255.0
•
Username: user
•
Password: user
3.4 Radio Operating Parameters
Frequency Bands
The radios will operate within the range 360
–512 MHz / 928-960 MHz, but the radio must be factory-set to one
of the 20 MHz frequency bands shown in the following table. Care must be taken when ordering to select the
correct band for your locale because the frequency cannot be configured outside of its band.
The following frequency bands are available.
Band
Frequency Range
Band
Frequency Range
370
360
–380 MHz
390
380
–400 MHz
410
400
–420 MHz
430
420
–440 MHz
440
430
–450 MHz (Default)
460
450
–470 MHz
480
470
–490 MHz
500
490
–512 MHz
950
930-960 MHz (Default)
NOTE Modems must be ordered to operate in the desired band. Modems cannot be tuned to a frequency
outside of its factory-set band.
Data Rate
The WI-MOD-xxx-E-5W can be configured with different radio transmission rates. Selections available are 9600 and
19200 bps for wide band radios or 4800 and 9600 bps for narrow band. The data rate only applies to transmit
messages; the radio is able to receive on all available data rates. Reducing the data rate can increase the reliable
communication range of the module. For example, if the received signal level is low, the data rate could be reduced
to improve communications.
It is important that the data rates on the client radios be configured appropriately for the radio link. The default data
rate will be set to the high level depending on the bandwidth. For example, it is set to 19.2 Kbps if the radio is wide
band (25 kHz) and 9.6 Kbps if the radio is narrow band (12.5 kHz). If the signal strength (RSSI) for the radio is less
than
–100 dBm for narrow band and –110 dBm for wide band radios it is recommended that the radio data rate is
reduced to the lower rate. The received signal strength indicator (RSSI) can be viewed on the Connectivity page of
the
module’s Web Server. For details, see “5.2 Connectivity” on page 70.
NOTE When an access point first communicates with a client it remembers what data rate it is using and
from then on will communicate at that rate. All UDP broadcast traffic and beacon messages will use the
lowest date rate from all the modules in the system.
Receiver
The RSSI varies depending on the radio channel width and whether the radio is a wide band radio using 25 kHz
channels or a narrow band radio using 12.5 kHz channels. The transmit data rate also varies depending on the
receiver sensitivity. Refer to the following table on receiver sensitivity.
Receiver Sensitivity
Baud Rate
Bandwidth
4.8 Kb
9.6 Kb
19.2 Kb
25 kHz Channel
N/A
–110 dBm
–99 dBm
12.5 kHz Channels
–111 dBm
–100 dBm
N/A
