my idea is when i send a message as MTR ON pump should run and i should get a message as MOTER IS ON. when i send MTR OFF pump should turn off and i should get a message as MOTER IS OFF. system should have a LCD interface and it should display MOTER ON when pump is on. And it should display MOTER IS OFF when its off.
any how rx and tx of rs232 is connected to tx and rx of mcu. port a is connected to lcd in 8 bit manner.