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Maximum distance protocol to communicate with about 40 controllers

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dhakeparag81

dhakeparag81

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hello guys,

i am trying to communicate about 40 controllers, these controllers are different height in building.
I am in trouble to use protocol.

plz suggest me the protocol which will communicate with long distance minimum wire use for overall communication.
 

I would tend to use Ethernet (the building may already have a local area network?) but WiFi or Zigbee may be possible
what communications facilities do the controllers have?
 

i am use pic 18f87k22 for master
once i decide protocol then i moving to choose slaves.
 

instead of using any external devices can i use internal peripherals?

like i2c or usart
 

dhakeparag81 said:
instead of using any external devices can i use internal peripherals?

like i2c or usart
Click to expand...
I2C is Inter-Intergrated circuit and for local on PCB communications only.
if the USART supports RS485 that could be possible??
 

in theory, rs485 could work up to 32 devices in a 1000meters bus...that if you use a MAX485 as interface chip... but if you use the MAX487 ( or was 1487?) you could have up to 120 devices on the bus... ( of course you need to have all of them as max487...
also you can use/implement/buy a rs485 repeater...
 

thanks for reply

I am decided to use i2c protocol to communicate but as we know its distance limitation
i m gonna use i2c to 485 bidirectional converter.
 

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