Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

GSM Modem issue as it sometimes doesn't work

Status
Not open for further replies.
M

mos_halas

Newbie level 4
Joined
Nov 24, 2005
Messages
7
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,328
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,
 

GSM Modem Issue

maybe u can try to check the baud rate
 

Re: GSM Modem Issue

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
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top