RS232:
RS232 STANDS FOR RECOMMENDED STANDARD 232 
IS A STANDARD FOR SERIAL BINARY DATA SIGNALS CONNECTING BETWEEN A DTE (DATA TERMINAL EQUIPMENT) AND A DCE(DATA CIRCUIT-TERMINATING EQUIPMENT)
THE ORIGINAL PIN LAYOUT FOR RS232 WAS DEVELOPED FOR A 25 PINS D SUB-CONNECTOR. IN THIS PIN-OYT PROVISIONS WERE MADE FOR A SECONDARY COMMUNICATION CHANNEL . IN PRACTICE,ONLY ONE COMMUNICATION CHANNEL ACCOMPANYING HANDSHAKING IS PRESENT . FOR THAT REASON THE SMALLER 9 PIN VERSION IS MORE COMMONLY USED TODAY............................
EXAMPLE CONNECTIVITY:-,
RS 232 9 PIN ASSIGNMENT :
RS232 DB25 PIN ASSIGNMENT:
DEC MMJ PIN ASSIGNMENT:
RS232 DB9 TO DB25 CONVERTER:
USB TO RS232 CONVERTER:
IF YOU WANNA DRIVERS FOR USB TO RS232 TRY TO SEARCH VIA GOOGLE OR FOLLOW THIS URL
http://www.ftdichip.com/
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