Hi, I can send the command "AT+CMGR=1" To GSM modem, but after that i cannot access the message from it. The modem is "Iwow" and microcontroller is 89c52. I have used Tx, Rx and ground pin of RS232. whether it is necessary to use RTS and CTS pins for this modem? When i send the command "AT+CMGR=1" to GSM modem, a pulse will be coming at TI pin of microcontroller. meanwhile there is no pulse at RI pin, indicating no message has been retrieved from GSM modem. But if i connect it to Hyperterminal i can read the message.
Please find a solution to this problem..
What is wrong? That you seem to be in the wrong thread. Your post doesn't seem to be an answer to the OP question about problems with a GSM modem.
What is wrong? That you haven't spent any time to describe your problem, giving relevant - and required - background information.
What is wrong? That you think you can get a higher priority by using a message header mentioning 'urgent'.
What is wrong? That you think you can get a higher priority by using an anonymous name that implies that your question is more important than other peoples questions.
What is wrong? That you haven't noticed the quite common convention of beginning sentences with an upper-case letter.
What is wrong? That you think your question gets a higher priority if you end it with a large number of question marks.
I don't believe that "error cl4053" is even a C51 error code?