Cellular Radio Module Problem

Archive
1

Software:VS 2012 with latest SDK.

Hardware:Spider + button + Cellular Radio Module

I simply test the SMS function in Cellular Radio Module but have some problems.

When the GsmNetwork is ok, I press the button to send the SMS.
But, after several times trying, the Debug output of VS is hanging. Can’t see any response when button pressed.
And the D1 and D2 LED turning off, then turning on after 40 seconds, then turning off after 15 seconds…repeat again and again.

Any suggestion?

Thank you so much.

        void ProgramStarted()
        {



            // Use Debug.Print to show messages in Visual Studio's "Output" window during debugging.
            Debug.Print("Program Started");
            cellularRadio.DebugPrintEnabled = true;
            cellularRadio.PowerOn(40);
                    
            button.ButtonPressed += button_ButtonPressed;

            cellularRadio.GsmNetworkRegistrationChanged += cellularRadio_GsmNetworkRegistrationChanged;
        }

        void button_ButtonPressed(Button sender, Button.ButtonState state)
        {
            cellularRadio.SendSms("0963354403", "test");
            Debug.Print("SMS send");
        }

        void cellularRadio_GsmNetworkRegistrationChanged(CellularRadio sender, CellularRadio.NetworkRegistrationState networkState)
        {
           Debug.Print("GSM is ok");
          // cellularRadio.SendSms("0963354403","test");
        }

Output:

Program Started
The thread ‘’ (0x3) has exited with code 0 (0x0).
CellularRadio : Turning ON
CellularRadio : Turning module on
CellularRadio : <
RDY

CellularRadio : <
+CFUN: 1

+CPIN: READY

CellularRadio : <
+CREG: 0

GSM is ok
CellularRadio : <
+CREG: 2

GSM is ok
CellularRadio : SENT: AT

CellularRadio : SENT: AT+CMGF=1

CellularRadio : <AT

OK
AT+CMGF=1

OK

CellularRadio : SENT: AT+CSDH=0

CellularRadio : <AT+CSDH=0

OK

CellularRadio : SENT: AT+CPBS=“SM”

CellularRadio : SENT: AT+CPMS=“SM”

CellularRadio : <AT+CPBS=“SM”

OK
AT+CPMS=“SM”

+CPMS: 9,30,9,30,9,30

OK

CellularRadio : SENT: AT+CNMI=2,1,0,1,0

CellularRadio : SENT: AT+COLP=1

CellularRadio : <AT+CNMI=2,1,0,1,0

OK
AT+COLP=1

OK

CellularRadio : SENT: AT+CGREG=1

CellularRadio : <AT+CGREG=1

OK
AT+CREG=1

OK

CellularRadio : SENT: AT+CREG=1

The thread ‘’ (0x5) has exited with code 0 (0x0).
CellularRadio : <
Call Ready

CellularRadio : <
+CREG: 1

+CGREG: 0

GSM is ok
CellularRadio : <
+CGREG: 1

CellularRadio : <
+CREG: 1

GSM is ok
CellularRadio : <AT+CMGS=“+0963354403”

SMS send
CellularRadio :
CellularRadio : <
+CMGS: 114

OK

CellularRadio : <AT+CMGS=“+0963354403”

test>
SMS send
CellularRadio : <
+CMGS: 115

OK

CellularRadio : <
+CREG: 1

GSM is ok
CellularRadio : <AT+CMGS=“+0963354403”

SMS send
CellularRadio :

2

The LED turning off indicates a power issue. What are you powering the board from?

The module requires a lot of power when transmitting even if just for a few ms.

I am using the cellular module just now with my own driver and it is working fine.

1 Like
3

I use AC-DC Adapter output 11-13V, 3.8A Max.

4

What are the D1 and D2 led indicates?

5

Looking at the schematic, D1 indicates the NETWORK status and D2 the STATUS.

If you check the documents for the SIM900 it will tell you what each output state should be.

www.sim.com although it appears to be running very slowly just now.

6

Some problem in the spider.
When I change other spider, it is ok.
I also find some good post here.

7

I finally got the datasheet for the SIM900 and D2 is connected to STATUS which is power on status.