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SN65HVD62 DIR control

Doane Arnold
Intellectual 335 points
Other Parts Discussed in Thread: SN65HVD62

I would like to connect my micro controller Tx and Rx to the Tx and Rx lines between the SN65HVD62 and RS485 transceiver (SN65HVD8088 or similar). Can I override the DIR line from the SN65HVD62? Without control of the DIR line, the micro can't control the RS485 transceiver direction.

Thanks.

  • 0
    TI__Guru 62920 points
    Hi Doane,

    It is OK for the microcontroller to handle the RS-485 direction control instead of HVD62. You could connect DIR to one of the microcontroller's inputs so that it is able to tell in which direction the HVD62 is operating.

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    Intellectual 335 points

    Thanks Max. I'll try using the DIR line as an interrupt and respond accordingly.

    Perhaps a discrete OR gate would also work. The OR'ing of the micro and SN65HVD62 DIR lines could control the transceiver direction. Anyways, excellent part! It replaces a lot of components and frees up needed real estate.

    Doane