TTL TO RS232 #COM PORT MINI2440

Hi I am roberto, i have a problem about programming a software to
communicate with two device with rs232(alias COM PORT)

I need two port "COM" (2 channels) rx1,tx1, rx2,tx2 on the board. 

My question: "Is possible with mini2440 System Linux to make a program to
communicate with two device with rs232 cable?">

  First: I want send "A" on tx1 -> COM1 and receive "B" on rx2;
  After: I want send "B" on tx2 -> COM2 and receive "C" on rx1;

Thanks for the answers.