Cant make Sim900 run

[friis]

Hi,
I have a pgm:

#PICAXE 28X2
#Terminal 9600

sertxd ("Start",cr,lf)
hSerSetup B115200_8,%001
pause 2000

MAIN:
    hSerOut 0, ( "AT",cr )
         
    hSerOut 0, ( "AT+CMGF=1",cr )
                
    hSerOut 0, ( "AT+CMGS=",$22,"+4581116757",$22,cr )
        
    hSerOut 0, ( "Bla, bla", $0A )

1. First time I run it after having started up the Sim900 using the Power Key the Sim900 answers OK at every step.
2. It does not, however, send the SMS
3. The second time I run it, the answer is > at every step even though the Power Light and the Net Light have not changed.

It is as if the Sim900 shuts down after the first run. As a matter of fact it does that already after the statement:

hSerOut 0, ( "AT+CMGS=",$22,"+4581116757",$22,cr )

Maybe that is why it does not send the SMS.

Can anyone help?
best regards
torben

 

[friis]

Hi,
I should add that I have made the connections a per:

SIM900 GSM GPRS Shield with Arduino | Random Nerd Tutorials

This post is a complete guide to the SIM900 GSM GPRS Shield with the Arduino. Learn how to sends SMS, receive SMS, make and receive phone calls with Arduino. We provide schematics on how to wire the shield to the Arduino, and all the sketches needed to send and receive SMS, as well as to make...

randomnerdtutorials.com

 

[friis]

Hi,
All of a sudden sim900 suddenly decided to cooperate.
torben