Hi to all,

Soon my electronic gate will be ready witch is
About 120 feet far from my desk and I need to
Build bidirectional communication with whole
House there are doors and switches I need to know
The status of it. My favorite interface is I2C but the problem
Is that I2C is not good for 120 feet distance I guess my
Choice is RS485 differential phase but what I do not know is
By using 4 wires 2 for receive and 2 for transmit can I communicate
with all 35 sensors ?. So rs485 works like rs232 I do not see any way
of sharing from same bus I need to make communication like I2c but
for 120 feet long any help will highly appreciated.

Andre

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