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mos_halas
Joined: 24 Nov 2005
Posts: 15
Helped: 1
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 07 Jun 2006 9:30 GSM Modem Issue |
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Hello,
I have a GSM Modem, I used it for SMS only. I checked it using Hyper terminal and it works very well.
I did make a circuit with 89c51 and simple program to send SMS but it works some times and some time not.
Any one know what is the problem.
Thanks,
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wclee
Joined: 24 Apr 2006
Posts: 4
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| 02 Jul 2006 3:14 GSM Modem Issue |
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| maybe u can try to check the baud rate
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Sudhir.K.A
Joined: 26 Feb 2006
Posts: 46
Helped: 5
Location: Bangalore
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| 02 Jul 2006 5:38 Re: GSM Modem Issue |
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Hi mos_halas,
i had faced similar problem. My observation was sometime it gives lower layer failure error.( i guess CMS +321 instead of OK).This sometimes happens if the signal strength is weak ( at+csq =5,0) or network is busy.
I suggest you first make sure about signal strength and then try sending SMS.
regards,
Sudhir
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