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c code to send AT and receive OK

Other Parts Discussed in Thread: TMS320C5515, TXS0102

hii currently i am working on a project in which i faced some problem please help me

hardware detail

TMS320C5515(DSP KIT)

TELIT GL865

TXS0102 (voltage level transleter)

software detail

ccs v5

window 7

i want to control TELIT from out side means, i want to send AT command from DSP KIT to TELIT and want to receive OK as response.

but when i run the code it does not give OK . i new to this set up i don't know where is the problem and what is the problem ?

i have connected TXD of TELIT to RXD of DSP and RXD of TELIT to TXD of DSP and also using voltge level converter. but i am not getting ok please help me. 

also if someone have c code for this please send me at ummedece@gmail.com