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SN65HVD11: Protocols used in RS-485

Gerhard van Rensburg
Intellectual 400 points
Part Number: SN65HVD11

I know there is no standard / defined Protocol for RS-485, but:

Is there some "generally / most used" in industry?

Is using RS-232 (Start, 7/8 bits, STOP) widely used.

Is using MODBUS OK?

Any suggestions appreciated

  • 0
    TI__Guru 62920 points
    Hello Gerhard,

    Yes, the simple "UART" style protocol with start/stop bits and a defined number of data bits is very common, and MODBUS is frequently used as well. There are also a range of different protocols available depending on application needs. A common thread is that the idle state is often represented by a logic high state, with a single low bit used as a "start" indicator marking the beginning of a frame of defined length and structure. There is often a master/slave hierarchy so that it is clear which transmitter is allowed to drive the bus at a given time. Some applications may add some complexities such as CRC error checking or other collision avoidance mechanisms.

    I hope this helps - please let us know if you have further questions.

    Max