J
Greets,
I am getting ready to start design of an HMI product. I have two possible design points, both of which I plan to do (Modbus Master or Modbus Slave ...), but I'd like to know if anyone has seen an extension to the Modbus/RTU protocol which would allow a Master to pass control to a Slave.
The scenario I have in mind would be "some device" which functions in the usual manner as the Master, polling Slave devices, and doing its thing. It would periodically "do something" that would indicate to a Slave (my HMI device running in this "hybrid" mode) and that Slave would then be able to operate as a Master until it was done, then it "did something else" which signaled to the Master that the Master was in control again.
I know how to design the protocol myself, I'm just trying to be lazy and use something that someone else might have designed already.
I am getting ready to start design of an HMI product. I have two possible design points, both of which I plan to do (Modbus Master or Modbus Slave ...), but I'd like to know if anyone has seen an extension to the Modbus/RTU protocol which would allow a Master to pass control to a Slave.
The scenario I have in mind would be "some device" which functions in the usual manner as the Master, polling Slave devices, and doing its thing. It would periodically "do something" that would indicate to a Slave (my HMI device running in this "hybrid" mode) and that Slave would then be able to operate as a Master until it was done, then it "did something else" which signaled to the Master that the Master was in control again.
I know how to design the protocol myself, I'm just trying to be lazy and use something that someone else might have designed already.