giovaniluigi
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I was reading about RS485 BUS design and I have some questions about the bus.
First I noted that I need to do a termination on the BUS trunk cable in order to finish the bus.
In a cascade configuration like:
[MASTER] -> [NODE 1] -> [NODE 2] -> [NODE 3] -> [TERM.]
The slave nodes are going to be added to the BUS and when you finish to add nodes you place a termination.
But, this is not a good thing to me. In my case I need to have a central node.
A PCB where all the nodes are going to be attached.
This is because I want to use a small and short cable for each node instead of the trunk cable passing through all the nodes.
My system will have the master node as a "Central node".
To do this I will let the trunk inside the master node PCB with a termination at the end of the PCB track.
In the middle of the PCB track I will place connectors to attach slave nodes.
Those nodes are not going to have terminations and they will use "long" cables.
![rs485_trunk.jpg rs485_trunk.jpg](https://www.edaboard.com/data/attachments/26/26235-361f51fa7b0fb3148bef544c4ac4854e.jpg)
My question: Is that scheme correct ?
Can I use RS485 this way ?
The trunk in my case is the shortest cable (actually a PCB track).
First I noted that I need to do a termination on the BUS trunk cable in order to finish the bus.
In a cascade configuration like:
[MASTER] -> [NODE 1] -> [NODE 2] -> [NODE 3] -> [TERM.]
The slave nodes are going to be added to the BUS and when you finish to add nodes you place a termination.
But, this is not a good thing to me. In my case I need to have a central node.
A PCB where all the nodes are going to be attached.
This is because I want to use a small and short cable for each node instead of the trunk cable passing through all the nodes.
My system will have the master node as a "Central node".
To do this I will let the trunk inside the master node PCB with a termination at the end of the PCB track.
In the middle of the PCB track I will place connectors to attach slave nodes.
Those nodes are not going to have terminations and they will use "long" cables.
![rs485_trunk.jpg rs485_trunk.jpg](https://www.edaboard.com/data/attachments/26/26235-361f51fa7b0fb3148bef544c4ac4854e.jpg)
My question: Is that scheme correct ?
Can I use RS485 this way ?
The trunk in my case is the shortest cable (actually a PCB track).