Multiple clients on the RS485 bus

[MrWaloo]

Hi,

On one equipment, there is only one RS485 bus on which there already are one client and one server. The existing client polls every X seconds and then waits for Y seconds. I would like to know if there is a clean solution to wait until the bus is free in order to send requests during the idle time.
For now there is a workaround in a while True loop, for example:

while True:
  time.sleep(1)
  rr = client.read_holding_registers(some parameters)
  if not rr.isError():
    break

decoder = BinaryPayloadDecoder.fromRegisters(rr.registers)
...

But to me this solution isn't proper.

Would there be a better solution?

Regards

[janiversen]

No there are no clean solution, because the modbus protocol is designed to have only one client (called master in the protocol spec).

[MrWaloo]

Thank you Jan