User's Guide

ThingMagic M6e User Guide 26
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• Frequencies used in the order of entries in the table. If regulatory requirements state that channels must
be hopped in random order, then the frequency list of channels must be randomized before downloading
the hop table into the module.
Antenna Ports
The M6e has four monostatic antenna ports. Each port is capable of both transmitting and receiving. The
modules also support
Using a Multiplexer, allowing up to 16 total logical antenna ports, controlled using two
GPIO lines and the internal physical port J1/J2/J3/J4 switching.
NOTE: The M6e 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 J1/J2/J3/J4 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 16 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 M6e Physical
Port
1 Low Low J1
2 Low Low J2
3 Low Low J3
4 Low Low J4
5 Low High J1
6 Low High J2
7 Low High J3
8 Low High J4
9 High Low J1
10 High Low J2