TI_0 and TI_1 should be set to 0.
Then the Interupt handler must take care of TI.

Look at the Keil Serial Sample Code.
(What Complier are you using?)

Plus "Not A PC"

You have an 8 bit CPU with no sign handling.
16 bit signed ints make it do un-needed work. (Yes 16 not 32 or 64)
Use unsigned where you can. Use unsigned char where you can.
You get smaller faster code. ( you could save 2 or 3 dozen bytes with just your present code)
For Extra credit you can use "bit" for true false flags.

This is bad:
int response2Array[5]={0x04, 0x6C, 0xF1, 0x10, 0x60};
first you are using 10 bytes to store 5. Second you have constant data in RAM so it is 10 bytes in RAM and 10 more in ROM.
Try:
code unsigned char response2Array[5]={0x04, 0x6C, 0xF1, 0x10, 0x60};
5 bytes ROM, 0 bytes in RAM

Keil has a chapter on this.