644NN Get RF Attenuation
!
644NN
sets the attenuation control for the output RF power where NN is a hexidecimal value
from 00 to 0A. Settings for attenuation are 1.0 dB increments over a range of 10 dB
of attenuation from the maximum power setting of 33 dBm at full power to a minimum
power level of 26 dBm.
Note: If using an ETSI AI1422E, the default RF power attenuation will be A03 and will not accept a
lower attenuation.
The Set RF Attenuation command NN variables and corresponding attenuation settings are shown in
.
Table 14 RF Attenuation Command Variables
Variable (NN)
Attenuation Setting (dB)
00
0
01
1
02
2
03
3
04
4
05
5
06
6
07
7
08
8
09
9
0A
10
Reader response:
!Done
647XXX Select RF Operating Frequency (Used only for FCC Part 90 Units)
!
647XXX
sets the reader RF from 860 to 930 MHz in 250 kHz steps, where XXX is a
hexadecimal value from 000 to 118. After the reader’s frequency is set, the value is
stored in non-volatile RAM (NVRAM). This value is not altered by power-down.
If the NVRAM becomes corrupted, the correct operating frequency cannot be
guaranteed. In this circumstance, the RF section shuts down and the reader sends an
Error06
message to the host. Until the frequency is reset using command
!647XXX,
the unit displays 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.
Note: Frequency does not have a factory default and must be programmed by the end user.
Chapter 6 Commands
TransCore Proprietary
6–45
