User Manual

ThingMagic Nano User Guide 7
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GPIO State to Logical Antenna Mapping
Number of GPIOs and antenna mux GPO pins are dependent on the type of reader (module) connected.
The following charts give the complete mapping of GPO states to logical antenna numbers for the Nano
module. Also shown is the physical antenna on the module which is active and presumably fed into a
multiplexer controlled by the GPO lines.
If any GPO line is unused, assume its state is permanently low and eliminate all row entries corresponding
to a high state for that GPO line – those logical antenna numbers will not be used. This method has the
following advantages:
1. The low number logical antennas always correspond to the physical ports. For example, logical port 4
will always correspond to physical port 4 on the module regardless of the use of GPO lines.
2. Use or non-use of GPO lines will result in logical antennas being added or deleted, but the port
numbering will always remain consistent. For example, logical port 6 corresponds to GPO1 low and
GPO2 high. If GPO3 is added to control a multiplexer, port 6 will still correspond to GPO1 low and
GPO2 high if GPO3 is low. There will not be a complete re-association of GPO states to logical antenna
numbers.
GPIOs Summary
Module GPIOs PortSwitchGPOs No. of logical antennas
Nano 4 4 16
Nano Logical Antennas Mapping
Logical
Antenna GPO 1 State GPO 2 State GPO 3 State GPO 4 State
Active M6e
Physical Port
1 Low Low Low Low J1
2 High Low Low Low J1
3 Low High Low Low J1
4 High High Low Low J1
5 Low Low High Low J1
6 High Low High Low J1
7 Low High High Low J1
8 High High High Low J1
9 Low Low Low High J1
10 High Low Low High J1
11 Low High Low High J1
12 High High Low High J1
13 Low Low High High J1
14 High Low High High J1
15 Low High High High J1
16 High High High High J1