Wired Communication is not dead, yet.

Yes, that’s right, wired communication is not dead, not today. We all know that wireless is the future of communication and it grows very fast. But we can deny the fact that long distance funicular communication is still popular.

On this project, we will be converting RS232 and RS485 with an Automatic RS – TX control. One of the most used, easy to develop and easy to apply communication protocol, the RS232 is generally the standard at the MCU applications. But the restriction, it only allows us to use maximum 15 meters cable. The main problem with using RS232 is that when the distance increase, the noise at the common ground line also increases. Another issue on using RS232 is that we are only allowed to only two devices to communicate reciprocally.

With the above problem mentioned while using RS232, RS485 is here to the rescue. What the RS484 separates from RS232 is that it can transfer data depending on the potential difference the two communication wires. On RS484, we can transfer data up to 1220 meters far away and with a rate up to 10Mbps and we can have 32 devices that can be joined.

The main advantage of this converter is, it can detect the incoming/outgoing data and switch the TX and RX modes of MAX485. It controls the DE and RE enable bits automatically. The RS485 lines A and B are taken from the screw terminal block. The connections are shown in the layout that is inside the downloadable zip package.