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S251B reader and 4ch-mux

Akash Nakarmi
Prodigy 190 points


I am trying to read from 4 antennas using S251B and RI-MOD-TX8A multiplexer. I couldn't figure out which port to use from S251B to connect to CSA-CSB channel select pins on the mux. 

  • 0
    Prodigy 190 points

    Now that I figured out, CSA & CSA pins need to be connected to general I/O ports ( 6 & 7) of the reader.

    The reader (s251B) is connected to PC via RS232, and I'm using ASCII commands to read from four antennas.

    "YA" command sets ports 6 & 7 to 10 so that the third antenna connected to the multiplexer can be read. When I send "J" command to verify if the ports were set, I got "J0A" back, which meant it indeed did.

    When I try to read, it still reads from the first antenna, instead of the third. Am I missing anything here?