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build RS485 network on ROS

Dear All

I am testing the possibility of using ROS as a host to communicate with a 10 nodes RS485 network. Each node is one MCU with RS485 interface opened.

I looked through ros.org and ros answers did not get luck. Has any one done this type of work before? As a starting point, I am looking for a RoS compatible RS485 card and starting code to convert RS485 package to ros standard msg. Certainly you are more than welcome to send any suggestion on choosing other network such as CAN, Ethernet, or EtherCAT. Thanks a lot.

Jayson