Communication over a long distance using cable.

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guys, need help.
i want connect several arduinos cable. there 1 master , several slaves. distance between master , slave 30 meters. know can't use i2c, use serial (rx & tx) , rs485 communication (with max 485). also, slaves should read , write data master, , master should read data slaves, , should write data every slave. problem example want send data slave no. 2 don't want send slave no. 3.

is possible send data master 1 of several slaves? in i2c use adress of device, can't rs485... right?

how solve problem?

you can define protocol includes header address , length.  slaves not addressed ignore remainder of message.


Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > Communication over a long distance using cable.


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