The Master
- 30th August 2009, 06:04
Hi, I need to have multiple RS485 lines going from a single point to multiple nodes. In this case its not feasible to connect the nodes as normal so i need to make a splitter. The splitter will need to take data from the main node and send it to all other nodes and also take data from other nodes and pass it back to the main node. The other nodes will never need to communicate with each other.
I can take input from the main node and send it to the rest easily enough but accepting data from the other nodes is a little tougher. I thought about using PNP transisors. The DI pin to the main node would be held low with a resistor. Each of the other RS485 chips would have its own transistor. When data arrives it turns the transistor on, the transistor then makes DI on the main RS485 chip high.
Is this a good way of doing it? Are there any better (but simple) ways?
I can take input from the main node and send it to the rest easily enough but accepting data from the other nodes is a little tougher. I thought about using PNP transisors. The DI pin to the main node would be held low with a resistor. Each of the other RS485 chips would have its own transistor. When data arrives it turns the transistor on, the transistor then makes DI on the main RS485 chip high.
Is this a good way of doing it? Are there any better (but simple) ways?