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Author Message
Darien Alvarez de la Cruz
New member
Username: Darienalvarez

Post Number: 4
Registered: 09-2008
Posted on Tuesday, September 30, 2008 - 04:11 pm:   

I have a big problem with modems.

I am developing an application to send and receive SMS messages. The application works fine but my problem is related to the time.

I need to run my app continously 24 hours. It works ok but just few days after, the modem don´t work and not response to AT+CMGS=LENGTH
PDU MESSAGE \u001A

The modem not return OK but some times send the message. I think that i broken 3 modems but i can´t broke any more.

I think that the problem is that i always have the COM port open just for increase performance.

Question:
1- I need to close the port if it is inactive?
2- I need a proffesional modem or a Telephone can do the job (every day of the year 24 hours).
3- Continously test can broke the modem????
4- I can know if the device is broken?? testing it by AT commands or ..... i don´t know.

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I have a lot of problems to send sms continuosly..... this is my secuence of commands (i modified that reading the port to see what commands send the NOWSMS)

AT

AT&FE0V1X1&D2&C1S0=0 (I don´t know the meaning of this command)

ATS0=0

ATE0V1

AT+CSMS=0

AT+CMGF=0

AT+CMGS=LENGTH OF PDU (this command some times response "" NOTING, I check if response OK or response <cr> in this case it works but if the comand response VOID i have nothing to do ...... my idea was send AT+CSMS=0, AT+CMGF=0 and if that commands response OK try to send AT+CMGS=LENGTH OF PDU again)

if i receive and ">" then send the pdu ........................ ctrl+z

WHAT CAN I DO???, this happens only some times i dont know why.......... If i have many messages in queue I only do:


AT+CMGS=LENGTH OF PDU
pdu ........................ ctrl+z

AT+CMGS=LENGTH OF PDU
pdu ........................ ctrl+z

AT+CMGS=LENGTH OF PDU
pdu ........................ ctrl+z



I need to send another command beetwen each SEND????? Maybe something like .......

AT+CMGS=LENGTH OF PDU
pdu ........................ ctrl+z

ATZ

AT+CMGF=0

AT+CMGS=LENGTH OF PDU
pdu ........................ ctrl+z



Include a reception sequence like this can cause PROBLEMS????

AT+CMGS=LENGTH OF PDU
pdu ........................ ctrl+z

AT+CPMS=ME (for example)

AT+CMGL=4

AT+CMGS=LENGTH OF PDU
pdu ........................ ctrl+z


Please help me, thanks in advance.

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