Configuring the Encompass 4 Reader
8-15
Radio Frequency
Caution
The authorized continuous wave (CW) frequency band for the Encompass 4 Reader
in the U.S. is 902.25 to 903.75 MHz and 910.00 to 921.50 MHz and the authorized
mo
dulated frequency band for the Encompass 4 Reader in the U.S. is 911.75 to
919.75 MHz. The RF for each Encompass 4 Reader at the site must be set according
to the frequency specified in the FCC site license. Only trained, authorized installa-
tion and maintenance personnel are permitted by FCC to set the RF.
By using the Encompass 4 Reader an authoriz
ed person can set the frequency within
the range from 902 to 928 MHz in 0.25 MHz steps. You can set the frequency by
using
a terminal emulation program and issuing the frequency command, as discussed
in section “647XXX Select RF Operating Frequency” on page 7-39.
Note: For backwar
d compatibility to existing controllers, you can set the RF operat-
ing frequency in 500-kHz steps using command #642NN.
To set the frequency range
1. Ensure that the host computer is
in command mode.
2. Enter command #647XXX
– where XXX is a hexadecimal value from 000 to 118
– and press ENTER. See command “647XXX Select RF Operating Frequency”
on page 7-39 for a complete listing of the h
exadecimal values and the
corresponding frequencies. For backward
compatible frequency selection, see
command “642NN Select RF Operating Frequency” on page 7-35.
3. To verify that the RF has been changed
to the proper setting, type in command
#527 to see the current frequency setting.
Caution
Contact TransCore if your application requires a frequency outside of the autho-
rized frequency range.
RF Transmission
The RF transmission can be controlled by one of the following methods:
• Connecting a vehicle detector to the sense input0 circuit
• The host sending software commands to the Encompass 4 Reader
As a factory default, the Encompass 4 Reader is configured to control
the RF power
with a vehicle detector.
Figure 8-8 illustrates the methods of controlling RF sense
output.
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