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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 ?
What is the problem with communicationg both MCU via one RS232? Just add the diode to Tx line so MCU would not affect each other. at least while they are not sending data at the same time.
Especially if you need only transmit data to displays.
With a normal cable RS232 should work for 150m at 9600bps.
The only thing that you need to add some adressing into your protocol that MCUs could distinguish if the data coming should be displayed or it is for another MCU.
Of course it is better to use anoter physical layer than RS232 for such distances.
As was said, RS485 is differential interface and more suitable for this, but RS232 should work too.
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