User's Guide

ThingMagic M6e User Guide 28
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Multiplexing up to 32 Ports
The M6e module can use 3 GPO lines to control an external multiplexer which expands one RF port to 8
RF ports.
The following table provides the list of all possible “logical” antenna ports and how the selection of that port
affects the GPO line state and which physical antenna is active. If you are using fewer than 3 GPO lines to
control the module or using fewer than the 4 physical ports, do not include the logical ports in your port list
that do not correspond to desired GPO and antenna configurations. When a port is not defined as a GPO
control, you can assume it is low with respect to the chart.
NOTE: Use of fewer than the maximum number of ports and GPO lines will result in gaps in the logical
antenna list. This is desirable because assigning additional GPO lines to multiplexer control will
not change the port assignments already established with fewer lines. If the non-contiguous
numbering is undesirable, you have the option to rename any logical port.
2 Low J2
3 Low J3
4 Low J4
5 High J1
6 High J2
7 High J3
8 High J4
Mapping of Logical Antenna Numbers to GPO Lines and RF Ports
Logical
Antenna
Number
GPO 3 GPO 1 GPO 2
Physical
Antenna
Number
1 Low Low Low 1
2 Low Low Low 2
3 Low Low Low 3
4 Low Low Low 4
5 Low Low High 1
6 Low Low High 2
7 Low Low High 3
8 Low Low High 4
9 Low High Low 1
Only GPIO 2 Used for Antenna Switching
Logical Antenna
Setting
GPIO
Output 2
State
Active M6e Physical
Port