ojahan
Newbie level 3
Hi all,
I try to connect ARM microcontroller to Huawei MC703 (CDMA EVDO), using Keil library.
If I connect using the PC (modem dial up) with RTS/CTS line used, connection is made and data transfer is OK. But if RTS/CTS line is not used, data transfer is not OK.
But if I use microcontroller, connection is made (received "CONNECT" message) but no subsequent data can be sent, even if RTS/CTS line is used.
Same firmware is used to connect with SIM900 GSM, and no problem found, RTS/CTS is not used.
My questions is:
- Does RTS/CTS line mandatory or make modem connection more reliable? I never use this control line before.
- Are there any difference in compression code, activation, security etc between CDMA and GSM?
Thank you for all members attention
Regards
Ojahan
I try to connect ARM microcontroller to Huawei MC703 (CDMA EVDO), using Keil library.
If I connect using the PC (modem dial up) with RTS/CTS line used, connection is made and data transfer is OK. But if RTS/CTS line is not used, data transfer is not OK.
But if I use microcontroller, connection is made (received "CONNECT" message) but no subsequent data can be sent, even if RTS/CTS line is used.
Same firmware is used to connect with SIM900 GSM, and no problem found, RTS/CTS is not used.
My questions is:
- Does RTS/CTS line mandatory or make modem connection more reliable? I never use this control line before.
- Are there any difference in compression code, activation, security etc between CDMA and GSM?
Thank you for all members attention
Regards
Ojahan