User's Guide

Review Copy 11-6-10
ThingMagic Micro Family User Guide
23
www.JADAKtech.com
Supported Regions
Region
Name
Country or
Region
Serial
Interface
Region
Code
1
Lowest
Frequency
Permitted
(kHz)
Highest
Frequency
Permitted
(kHz)
Smallest
Step Size
(kHz)
Maximum
Dwell Time
(sec)
Lowest
Channel in
Hop Table
Highest
Channel in
Hop Table
LBT Level
2
RU
Russia
0x15
866000
868000
200
0.4
866200
867800
None
SG
Singapore
0x16
920000
925000
100
0.4
920100
924900
None
VN
Vietnam
0x19
866000
869000
50
0.4
866450
867250
None
TH
Thailand
0x1A
920000
925000
250
0.4
920750
924250
None
AR
Argentina
0x1B
915000
928000
250
0.4
915250
927250
None
HK
Hong Kong
0x1C
865000
868000
100
0.4
865100
867900
None
BD
Bangladesh
0x1D
925000
927000
100
0.4
925400
926600
None
1
If Region=0, it is unconfigured and the module will not transmit. This is represented as "None" in the API and "Select"
(to encourage user action) in Universal Reader Assistant.
2
LBT is "Listen Before Talk". If a carrier is detected above the threshold, the channel will not be used.
Frequency Setting
The modules have a PLL synthesizer that sets the modulation frequency to the desired value. Whenever
the frequency is changed, the module must first power off the modulation, change the frequency, and then
turn on the modulation again. Since this can take several milliseconds, it is possible that tags are powered
off during a frequency hop. In addition to setting the default regional settings, the Micro has commands that
allow the transmit frequency to be set manually.
Warning: Use these commands with extreme caution. It is possible to change the module’s
compliance with the regional regulations.
Frequency Units
All frequencies in the Micro are expressed in kHz using unsigned 32-bit integers. For instance, a carrier
frequency of 915 MHz is expressed as 915000 kHz.
The PLL is set automatically to the closest frequency - based on the minimum frequency step size for the
current region - that matches the specified value. The Micro has an absolute minimum step size of 25 kHz.
Each region also has a minimum quantization based on regulatory specifications, which may be greater.
When manually setting frequencies the module will round down for any value that is not an even multiple of
the supported frequency quantization. For example, in the NA region, setting a frequency of 902,999 kHz
results in a setting of 902,750 kHz.
When setting the frequency of the module, any frequencies outside of the valid range for the specified
region are rejected.
Frequency Hop Table
The frequency hop table determines the frequencies used by the Micro when transmitting. The hop table
characteristics are:
• Contains up to 62 slots.
• Valid frequencies for the region currently selected.