Microcontroller networking

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microcontroller networking

Dear ALL

Kindly let me know which is the best protocol that can be used to network 3 or more micrcontrollers? The total wire length is about 1500 ft at least.


AKSHAT MEHRA

 

[cybersan2002]

For such length of wire X.10 protocols suits your application.

 

[sunish]

hai
you can use rs 485 protocol
which is simpler


regards

sun

 

[melc]

Even RS232 daisy chained on CAT5 cable (with MAX232 level converters) will work without problems at low speed rate.

 

[arnab.bhaumik]

hi,

i have a experience of the above situation. the project was a building fire alarm system which has a master control unit at the ground and 6 to 7 floor control unit.
the communication was bidirectional. they all connected via just 2 wires.


i used rs485 and at89c52. the communication is mode 3 serial communication(interrupt driven.)


it is really easy and very flexible. all communication with just 2 wires.

arnab
vu2bpw

 

[TechToys]

May also consider using external RS232<->Rs422 converter. It depends on how many units you are building. If it is going to be just a few units, it might not worth to take RS485 in chip level. Instead, using a simple MAX232 for full-duplex operation and use an external RS232<->RS422 converter could retain full duplex operation and make software more simple.

That sort of converter is around US$10-20.

John

 

[bobsanjose]

Another option would be CAN at baudrates at or below 50 kbit/s
Bob

 

[budhy]

Use current loop like this diagram