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RS232 Adapter Sch.
by 艾鍗學院, 2011-02-14 00:16, Views(4924)
 
RS-232 Level Converters/Shifter
 
Null Modem Wiring Diagram
 PC (+/- 12V)<----------->MAX232<----------------> MCU or sendor  3.3V~5V
   RS232                                                                       TTL
 
 

Standard serial interface is placed on the board. Level shifter MAX232 is used. MAX232 has two receiver and two transmitter lines. You can connect RXD and TXD of RS232 with RXD and TXD of microcontroller with help of config header

 

  
Null Modem Connections 
   
-------------------- 
 RS232<----------->MAX232<---------------->TTL
 TTL<---------------->TTL