hi all I wana to write a program to connect with a RS232 GSM/GPRS module which use AT&T commands .. ( Sim900 ) if I connect module to pc with any program like hyper terminal I can send and receive data command . but when I test it with 2 sample serial program in wince it doesn't work.. also those program are very good to communicate between mini2440 and my pc any help or any good sample project.??!!!
Any help....!!!
The baudrate, parity and number of bits are equal in the mini and in the sim900??Are you using hardware flow control?
Yes This sim900 module has max3238L , so it will auto sync ,, but I use baudrate 9600 and 19200 as I set it in hyperterminal and it worked grate with my pc....!!! what should I do ,, ? serial program with mini2440 and my pc works fine and my pc with sim900 module also ok....
Do you conected the rx pin of the mini in the tx of sim900, and the tx pin of the mini in the rx pin of the sim900?? Are you using the com1 port? Are you conecting in the db9(CON0) or in the conector on the board(CON1,CON2 or CON3)?? In the db9(CON0), the signals are rs232 level, before the max 3232, and you need to conect the sim in this port, if the sim have the max3238. In the board,(CON1-USART1, CON2-USART2 and CON3-USART3) the signals are ttl, in this case 0 to 3.3V.
yes I connected "rs232 db9 port" of my sim900 module to db9 of my mini 2440. as i said everything goes well when I connected module to pc and as you know with serial programs for wince we have good connection with Pc . is there any program like hyperterminal or putty for wince ? maybe serial programs for wince have problems? do you know someone who did it? thanks.
Plusboy, check if your cable is correct, if the pin 2 in one conector is conected in the pin 3 of other conector, and if the pin 3 is conected in 2. If no, do this because this is your problem.
I have the same problam, can u help me?? i'm sure that TX of mini2440 connected to RX of SIM900, and RX connected to TX
Boys this is quite simple!! just make a cable by crossing the wires even i faced the same problem developing an application with WINCE6 and mini2440 connected to a GSM GPRS modem Quectel M12 fabricated by me. the problem is the mini 2440's UART is reversely connected on the DB9 connector available at the board so just use one female and one male connector and cross connect pins 2 & 3 and make a straight connection with pin 5 of both connectors. i.e. connect pin 2 0f male connector to pin 3 of female connector and pin 3 of male connector to pin 2 of female connector and pin 5 to pin 5 every thing will work properly!!