I build one hardware from the circuit using AT89S52 and use serial communication to control your GSM modem
Now my question is, I want to monitor the data which I send from AT89S52 and also received data from GSM modem to my PC
for that purpose I build simple YV cable but it can't work.
please help me to build the cable.
"the circuit using AT89S52"
What circuit?
"your GSM modem"
Whose GSM modem? Keil do not make or sell GSM modems!
This forum is for discussing Keil products: http://www.keil.com/forum/
"I build simple YV cable"
What did you build? Describe it in detail. How did you test that you'd built it correctly?
"it can't work"
In what way does it "not work"? What have you tried? What happened? What were you expecting? What tests have you done to account for the difference?
"help me to build the cable"
What cable? Again, Describe in detail what you actually require,