SM5100B AT commands not responding

Wireless & IoT
1

Hello All,

I got the SM5100 and eval board to connect to my computer. Once I plug eveything in I get a start up response from the module of:

+SIND:1

+SIND: 10, "SM, 1, "FD", 1, "LD", 1, "MC", 1, "RC", 1, "ME", 1

+SIND: 3

+SIND: 8

+SIND: 4

Accoring to the data sheet this means the module is ready. I try to type “AT” into the command line and get no response. When I try to send a SMS by sending “AT+CMGS:” LynxTerm freezes.

Does anyone have any suggestions. I think it is probably a setting I am missing in Lynxterm, but I could really use somee help.

2

I figured out that you need to set it to no flow control.

3

Hi Tomatoeyes55 and all Sparkfun forum members!

I have same module and i have problems with PC - SM5100B communication. I got no respond on any AT command. I have tried x-ctu, putty, LynxTerm but nothing works well. As replay on power on button i get x-es and dots… i try also flow control, all baud rates up to 460800, data bits :8, parity: none, stop bits: 1

LynxTerm doesn’t support 460800 baud rate as i figured.

What is default baud rate?

Thanks in advance!

Friendly regards

Denis C

4

aboxdc:
What is default baud rate?

9600 8-N-1 on the shield

115200 8-N-1 for modules that have come off the factory line

5

Hi

:frowning: I’m also having connection problems with the gsm shield and hope that anyone could help we. The exact problem is a frame error (SerialError.Frame). I’ve connected the shield on top of the Fez Panda II. And my code to to connect to the shield looks as follows.

SerialPort gsmSerailPort = new SerialPort(Serial.COM1, 9600, Parity.None, 8, StopBits.One);

gsmSerailPort.Handshake = Handshake.None;

gsmSerailPort.Open();

Then I send data to the port with the following code

byte OutBuffer = System.Text.Encoding.UTF8.GetBytes(cmd + endline); //where cmd is some at command string

gsmSerailPort.Write(OutBuffer, 0, OutBuffer.Length);

And this last line is when i get the error. From all that i have read my port properties must be ok, but obviously not.

Any help would be greatly appreciated.