GSM modem sends unknown character

I'm having strange problem with my wavecom M1202B gsm modem. When I try to send a sms vai USART terminal of mikroC pro for avr , I can . But gsm modem responds with weird character . I can sen , read , delete messages and dial supplementary number . But sometimes modem responds as expected (normal response like

+IPR: 9600


OK )

but maximum time responds with weird character . I 'm facing problem I cant read nothing with

atemga 328P , but I can send sms with micro controller . Pls help me .

Hello,
-check if the baud rate you are using is correct.
-make sure your circuit is properly grounded.
Hope this helps

Try using Some other software, like HW Hercules
https://www.hw-group.com/products/hercules/index_en.html

Its free and very good.

I too face such problems with USART Terminal of Mikroelektronika.

extremely thnakx to TiagoRibeiro and xpress_embedo for reply . And also sorry for late reply .

TiagoRibeiro, I checked baud rate and ground connection , both were fine . Basically the problem occurred for power supply . I changed the power supply to 9V 1A , then it is just working fine though it sends garbage value sometimes like earlier . But this time , the rate of sending garbage value is decreased .

And Congratulations TiagoRibeiro , you have won a great victory , hope it'll lead your team to the trophy ( Champion ):-D

xpress_embedo , my opinion is somewhat different , I also checked my gsm modem with virtual terminal of proteus , gsm modem sent the garbage values as exactly when it was connected with USART Terminal of Mikro C . I also read the values by Atmega 328P ( with lcd connected ) in proteus , I got exactly same garbage value which were shown in virtual terminal and USART terminal .

Though the rate is minimum than earlier , gsm modem still sends garbage value . If you know any other issues , please let me know .

Thanks again to both of you .