why GSM modem is not responding to program but responding to hyperterminal or docklight?

Question

EDITED:

Im developing SMS application in java for reading SMS.Im sending AT commands to GSM mode for sending an SMS,messages is sending successfully ,but im not getting any response from the modem.If i send the AT commands through Hyperterminal im getting the response.Whats the exact problem?

            InputStream inputStream;
            OutputStream out;


            this.inputStream = serialPort.getInputStream();
            this.out = serialPort.getOutputStream();
            out.write(("AT"+"\r").getBytes());
            try {
                Thread.sleep(1500);
            } catch (InterruptedException ex) {
                Logger.getLogger(MainClass.class.getName()).log(Level.SEVERE, null, ex);
            }
            out.write(("AT+CMGF=1"+"\r").getBytes());
            try {
                Thread.sleep(1500);
            } catch (InterruptedException ex) {
                Logger.getLogger(MainClass.class.getName()).log(Level.SEVERE, null, ex);
            }
            out.write(("AT+CMGS=\""+"+91xxxxxxxxxx"+"\""+"\r").getBytes());
            try {
                Thread.sleep(1500);
            } catch (InterruptedException ex) {
                Logger.getLogger(MainClass.class.getName()).log(Level.SEVERE, null, ex);
            }
            out.write(("TEST "+cntrlZ).getBytes());
            try {
                Thread.sleep(1500);
            } catch (InterruptedException ex) {
                Logger.getLogger(MainClass.class.getName()).log(Level.SEVERE, null, ex);
            }


 //Im using SerialPortEventListener to  read the input from modem
int a = inputStream.available();
System.out.println(inputStream.available() + "  BYTES AVAILABLE ");
inputStream.read(readBuffer, 0, a);

I also tried to read after sending each AT commands,but im not getting anything as a response from the modem.

Could you post your port configuration? – ŁukaszBachman Dec 20 '11 at 09:34 — ŁukaszBachman, Dec 20 '11 at 09:34

score 2 · Accepted Answer · edited May 23 '17 at 12:12

2

Issues receving in RXTX

After setting the flow control for the serial port its working fine.

serialPort.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN |    SerialPort.FLOWCONTROL_RTSCTS_OUT);

edited May 23 '17 at 12:12

Community

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answered Jan 02 '12 at 05:03

Mukthi

561
4
13
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i am also working same application but not able to send message as i have getting port number successfully...plz help me to solve my problem... – Aniket Mar 18 '13 at 16:27

score 0 · Answer 2 · answered Dec 20 '11 at 10:12

0

Please make sure that you have installed all libraries required by SMSlib and your modem is on supported modems list. Having supported modem is not required, but can eliminate compatibility problem right off the bat.

Also you should verify if your modem is connected properly. You could perform some operations on it directly, via AT commands.

answered Dec 20 '11 at 10:12

ŁukaszBachman

33,595
11
64
74

Modem is working fine.I have checked it through hyperterminal. – Mukthi Dec 20 '11 at 10:16
Are you using Linux or Windows? – ŁukaszBachman Dec 20 '11 at 13:21
Ok, so please verify if you have followed all steps in installation procedure. I had similar issues when SMSlib was missing some libraries, but that was under Linux though. – ŁukaszBachman Dec 21 '11 at 08:32

why GSM modem is not responding to program but responding to hyperterminal or docklight?

EDITED:

2 Answers2