February-1st-2022, 08:26 AM
Well Devendra,
Question 1: is only the communication interrupted or is the whole Node-RED stopping for a split of a second?
Question 2: I see a lot of Modbus RTU nodes running at a time in your flow. I don't know how exactly the serial node is working since Hilscher is not the programmer. But what is if ALL nodes want to send out data at exaclty the same time to the RS485 interface? Maybe the nodes are not locked against each other ... and then nonsense is sent to serial port due to parallel access. In Modbus TCP this is no problem since Ethernet frames are sent ... but with Modbus RTU this is a single physical resource that cannot be shared. So I think you have to change your complete flow to use a single Modbus RTU node only. And also you have to implement a mechanism using the Topics feature in a node message to distingush the different messages from each other
Thx
Armin
Question 1: is only the communication interrupted or is the whole Node-RED stopping for a split of a second?
Question 2: I see a lot of Modbus RTU nodes running at a time in your flow. I don't know how exactly the serial node is working since Hilscher is not the programmer. But what is if ALL nodes want to send out data at exaclty the same time to the RS485 interface? Maybe the nodes are not locked against each other ... and then nonsense is sent to serial port due to parallel access. In Modbus TCP this is no problem since Ethernet frames are sent ... but with Modbus RTU this is a single physical resource that cannot be shared. So I think you have to change your complete flow to use a single Modbus RTU node only. And also you have to implement a mechanism using the Topics feature in a node message to distingush the different messages from each other
Thx
Armin
„You never fail until you stop trying.“, Albert Einstein (1879 - 1955)
