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RS422 general question

Motoyasu Hattori
Genius 11015 points

Hi,

 

I am not familiar with RS422.   So please let me know which comments is correct or not.

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According to RS422 specification, all RS422 devices can receive +-7V diff data.

Also, when one RS422 device send +-3.3V diff data, other devices can also receive this data.

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Thanks and best regards,

 M.HATTORI.

  • 0
    TI__Expert 5455 points
    Hello Hattori

    This voltage level that you said is actually the common-mode voltage level, you can have bigger differential voltage, (|VID| < 12 V maximum input differential voltage without damaging device, page 8 of spec www.ti.com/.../slla070d.pdf)
    And yes, this kind of devices work as multi-drop devices, you can check this video for more information (www.youtube.com/watch

    Please, let me know if you have other questions.

    Regards
    Francisco
  • 0
    TI__Guru**** 164976 points
    Motoyasa,

    In addition...

    RS-422 networks are typically point to point without devices in the middle of the cable. However devices in the middle can listen only. Cable termination is added at the end of cable at the receiver end. Data flows in one direction. Returning data will flow on a different pair of wires (full duplex).

    For multiple devices sharing a single pair of wires, use RS485 instead.