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UART-RS232-Adapter.php   6162 Bytes    02-02-2015 22:03:30


Micro-Projects • Tools : UART - RS232 Adapter





Micro-Projects • Tools : UART - RS232 Adapter



RS232 in the year 2014 ??? Yes ! As it is still the mother of all serial communications - and we use it often, we put this information here. As memory or clock stability is nowadays a self-evidence, we dropped that handshaking stuff. Only RX and TX are used. And they are used therefore, as the microprocessor would call them. The used 6-pin header has always the same pin assignment, so they (RS232,USB,XPORT,...) are all interchangeable.




Testing




The device may easily be tested using HTerm in a loopback configuration. (RX is tied to TX and so the data is send back to the computer). Current consumption was 6 mA at 5 V.


HTerm in action

HTerm in action HTerm in action


On the left side we see the RX signal which has almost 5 Vpp. On the right side : TX. We also see, that a logic one (high) is translated to -10V, whereas the logic zero (low) is +10V. The settings were 9600,8,N,1. The LSB is transmitted first. In binary form the word 'HOLA' looks like this :

START 00010010 11110010 00110010 10000010 STOP


3 EASY STEPS TO UNDERSTAND AND CONTROL YOUR RS232 DEVICES




Downloads








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t1 = 3844 d

t2 = 560 ms

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