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.

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.







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

0

0

0

1

0

0

1

0

1

1

1

1

0

0

1

0

0

0

1

1

0

0

1

0

1

0

0

0

0

0

1

0

STOP

3 EASY STEPS TO UNDERSTAND AND CONTROL YOUR RS232 DEVICES

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