Users Manual Part 3

Encompass 4 Reader System Guide
TransCore Proprietary.
7–118
642NN Select RF Operating Frequency
Caution
The authorized bands in the U.S. for CW frequency (i.e., ATA only) is 902.25 to 903.75 MHz and
910.00 to 921.50. The authorized frequency band for modulated frequency is 911.75 to 921.75
MHz.
Note: RF frequency can be set for backward-compatibility using command #642NN or for the
newer 250-kHz step method using command #647XXX.
Command #642NN sets the reader RF frequency from 902 to 928 MHz in 500-kHz steps, where NN is a
hexadecimal value from 00 to 34. After the reader’s frequency is set, the value is stored in battery-backed
RAM (non-volatile RAM, NVRAM). This value is NOT altered by power-down, loading default parameters, or
a flash download of new software (there is no default frequency value). It can only be changed by issuing
command #642NN.
Additionally, if the NVRAM becomes corrupted, the correct operating frequency cannot be guaranteed.
In this circumstance, the RF section will shut down and the reader will send an error message to the host
(Error 06). Until the frequency is reset using command #642NN after NVRAM corruption, the unit will
display the same error message every time it is powered up or if an attempt is made to enable the RF (by
host or by external sensor). The commands to set the RF frequency are listed in Table 32.
Table 32  RF Frequency Commands
Command RF Frequency (MHz)
Approved for
Use in the U.S.
(ATA only)
Approved for
Use in the U.S.
(modulated)
64200 902 No No
64201 902.5 Ye s No
64202 903 Ye s No
64203 903.5 Ye s No
64204 904 No No
64205 904.5 No No
64206 905 No No
64207 905.5 No No
64208 906 No No
64209 906.5 No No
6420A 907 No No
6420B 907.5 No No
6420C 908 No No
6420D 908.5 No No
6420E 909 No No

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