TransCore MPRX, System Manual

Page: 139 / 208

MPRX
TransCore Proprietary 8–13
To reset the reader
1. Ensure that the host device is in command mode.
2. Enter command
#63
. Press
ENTER.
The terminal emulation screen displays the sign-on message as shown in Figure
8-5 on page 8-8 .
Radio Frequency
Caution
The authorized continuous wave (CW) frequency band for the MPRX in the U.S. is
902.25 to 903.75 MHz and 910.00 to 921.50 MHz and the authorized modulated
frequency band for the MPRX in the U.S. is 911.75 to 919.75 MHz. The RF for each
MPRX at the site must be set according to the frequency specified in the FCC site
license. Only trained, authorized installation and maintenance personnel are permitted
by FCC to set the RF.
By using the MPRX an authorized person can set the frequency within the range from 860
to 930 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 7–28
Note: For backward compatibility to existing controllers, you can set the RF operating frequency
in 500-kHz steps using command #642NN.
To set the frequency range
1. Ensure that the host device is in command mode.
2. Enter command #647XXX – where XXX is a hexadecimal value from 000 to 118
and press ENTER. Refer to command “647XXX Select RF Operating Frequency” on
page 7-29 for a complete listing of the hexadecimal values and the corresponding
frequencies.
3. To verify that the RF has been changed to the proper setting, type in command
4. #527
to see the current frequency setting.
Caution
Contact TransCore if your application requires a frequency outside of the authorized
frequency range.
RF Transmission
The RF transmission can be controlled by one of the following methods:
• Connecting a presence detector to the SENSE0 circuit
• The host device sending software commands to the MPRX
As a factory default, the MPRX is configured to control the RF power with a presence
detector.
Figure 8 – 9 illustrates the methods of controlling RF sense output.