character not the same displayed wz wat was send out

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mkyfra

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Hi all,
I'm very new to hyperterminal and all. Im doing a project to send out an sms using pic18f452 on the later part.

I'm still at the stage on just testing out my gsm modem communication with PC.
I am able to send out an sms however the character that receive by my phone is not the same as wat i hv typed (at times I jus received blanks most of the time jus a square box). Appreciate if anyone cud help. Thanx a lot.

Serial GSM Modem by BluOcean
Baud Rate : 300 - 9600

Cheers...
 

Circuit diagram and your code snippet would help us to find out the problem

Nandhu
 

Hi Nandhu,

Thx for replying. Actually there is no circuits involved in this connection.
I simply connect the modem direct to my desktop using serial cable and try the hyperterminal to send an sms out to a phone that is all.

Codes that I use r as follows. Simple instruction codes.
at+cmgw="XXXXXXXX"
>hello(ctrl z)
at+cmss=1

everything was ok. msg received to my phone but not the hello msg, jus a square box.

Sori and thx

Cheers,
Kyfra
 

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