User's Guide

Review Copy 11-6-10
ThingMagic Micro Family User Guide
26
www.JADAKtech.com
In addition to setting the delimiter to 1, a TagFilter of the class ISO180006b.Select must be used in
order to read certain ISO18000-6b tags, specifically one of the following options must be used:
GROUP_SELECT_EQ
GROUP_SELECT_NE
GROUP_SELECT_GT
GROUP_SELECT_LT
GROUP_UNSELECT_EQ
GROUP_UNSELECT_NE
GROUP_UNSELECT_GT
GROUP_UNSELECT_LT
Antenna Ports
The Micro has two monostatic antenna ports. Each port is capable of both transmitting and receiving. The
modules also support Using a Multiplexer, allowing up to 8 total logical antenna ports, controlled using two
GPIO lines and the internal physical port Antenna1/ Antenna2 (A1/A2) switching.
NOTE: The Micro does not support bistatic operation, that is, transmitting on one port and receiving on
another.
Using a Multiplexer
Multiplexer switching is controlled through the use of the internal module physical port A1/ A2 switch along
with the use of one or more of the General Purpose Input/Output (GPIO) lines. In order to enable automatic
multiplexer port switching the module must be configured to use Use GPIO as Antenna Switch in /reader/
antenna/ portSwitchGpos.
Once the GPIO line(s) usage has been enabled the following control line states are applied when the
different Logical Antenna settings are used. The tables below show the mapping that results using GPIO 1
and 2 for multiplexer control (as is used by the ThingMagic 1 to 4 multiplexer) allowing for 8 logical antenna
ports.
NOTE: The Logical Antenna values are static labels indicating the available control line states. The
specific physical antenna port they map to depends on the control line to antenna port map of
the multiplexer in use. The translation from Logical Antenna label to physical port must be
maintained by the control software.
GPIO 1 & 2 Used for Antenna Switching
Logical Antenna
Setting
GPIO
Output 1
State
GPIO
Output 2
State
Active Micro
Physical Port
1
Low
Low
A1
2
Low
Low
A2
3
Low
High
A1