ThingMagic M5e - Manual (Page 6)

4 Port Multiplexer Board
Accessory Board Configuration 5
Antenna Port Control Lines
Note
Interpreting the control lines as binary ““numbers”” gives an incorrect order
relative to the physical order of the ports. A key printed on the board serves
as a reminder that, from left to right when looking down at the board, the port
order is J1 –– J2 –– J4 –– J3.
These lines can be controlled directly by an external controller/motherboard providing
TTL signals or by using signals from the M5e.
External MUX Control (Block 23)
When controlling the Multiplexer using external TTL signals the terminal pins on the board
serve as input signals as defined in
Antenna Port Control Lines table. In this configuration
the M5e software has no knowledge of which multiplexed line is in use. All antenna ports
on a Multiplexer will look like Antenna 1 or 2 (depending on which M5e port is used) and
the associated Antenna ID metadata will be the same for all four ports. It is the users
responsibility to manage coordination between the MUX control line settings and the M5e
RF operations and tag response data.
For this configuration no jumpers should be present on terminal block 23.
MUX1 MUX2
J1 0 0
J2 0 1
J3 1 0
J4 1 1