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RS-232 to RS-485 Interface Converters : The circuit we have chosen as our example is an RS232 to RS485 converter. This is a often needed device which can demonstrate a lot of principles of circuit design, and hopefully the finished project will be useful to some people, just as it stands
Feature  :
DB9 RS232 connector compatible with PC
TxD and RxD translated from RS232 to RS485
Direction of transmission controlled by PC RTS line
Indicator LED(s) to show communications traffic
Figure 1. Schematics of RS-232 to RS-485 Interface Converters
Data Sheet & Related Links :
MAX487
The MAX481, MAX483, MAX485, MAX487-MAX491, and MAX1487 are low-power transceivers for RS-485 and RS- 422 communication
RS-232 Tutorial
RS-232 is simple, universal, well understood and supported but it has some serious shortcomings as a data interface.
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