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asena said:Hi,
you can use a RS485 bus to transmit at that distance.
Just plug the PC to a RS232-to-RS485 converter, and at the other side do the opposite.
You can achieve great distances with a RS485 bus.
asena said:With a RS485 bus, you can have many participants together.
Go through the specifications of the RS485 and you'll understand better.
Just Google it.
mouzid said:But I have two microcontrollers. As far ase I know only one µc can communicate with via the RS232 How to resolve this problem ?
Any other better solution ?