• Register
    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Search

    RS232 GND pin

    Axon series
    2
    2
    78
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • R
      rtatibouet last edited by

      Hello,
      I own an Axon S215.
      I want to use the RS232 interface with a 12V RFID reader.
      How should I use the "GND" pin for RS232 on the Axon ? Do I need to use it ?

      I use another reader (12V as well) with the RS485 interface, but this one has no "GND" pin.

      Thanks !

      Martin Kudláček 1 Reply Last reply Reply Quote 0
      • Martin Kudláček
        Martin Kudláček @rtatibouet last edited by

        Hello @rtatibouet,
        the RS485 and RS232 are completely different buses.

        The RS485 is differential and doesn't need the GND, since the logic levels are based on the voltage difference between A and B terminal

        The RS232 is not differential and the TX / RX logic levels are based on the voltages between TX and GND and RX and GND.

        Best regards,
        Martin

        1 Reply Last reply Reply Quote 0
        • First post
          Last post