Questions about GPRS Modem --mc35

[MyOwn]

I want to use mc35 for transmiting data with gprs network, and encount some questions,
I should get my own IP address with PPP, when executing command:
AT+CGDATA=PPP,1 ENTER
I received string of "connect", and then about ten times of unknown characters, At last, "No Carrier" returned, and seemed return to deactivated state, What shall I do? thanks ahead.

 

[Eclipsed]

By GPRS you mean General Packet Radio Service, right? You have to have a GSM account(and sim card) through a cell service provider and that carrier usually has to enable GPRS on that account.What do you mean PPP and what does an IP address have to do with GPRS?

 

[MyOwn]

By GPRS you mean General Packet Radio Service, right? You have to have a GSM account(and sim card) through a cell service provider and that carrier usually has to enable GPRS on that account.What do you mean PPP and what does an IP address have to do with GPRS?

:?:
1 You are completely right with the meanings of GPRS!
2 My system is composed of MC35, a SIM card, which communicates with MC35 through 232 interface, and a MCU. Now I can send ATD*** command to dial a telephone, and attach to GPRS network with command AT+CGATT=1.
3 Of my understanding, IP is used for transmiting data throuth GPRS net, which is based on TCP/IP mechanism.
4 Presently, My difficulty is how I can get my own IP address? When I tried to convert MC35 to data mode with AT+CGDATA=PPP,1, MC35 returnd:
CONNECT
followed with a series of unknown characters, and at last with NO CARRIER
Where is wrong?

5In addition, What's the meanings of GSM account?

 

[Eclipsed]

GSM is the type of cell network that GPRS operates on.Sorry if I am insulting your intelligence with these questions but, Do you have a valid account with a GSM carrier that allows GPRS? Is GPRS enabled through that carrier? What part of the world are you in?

https://www.gsmworld.com/technology/gprs/index.shtml

 

[MyOwn]

GSM is the type of cell network that GPRS operates on.Sorry if I am insulting your intelligence with these questions but, Do you have a valid account with a GSM carrier that allows GPRS? Is GPRS enabled through that carrier? What part of the world are you in?

https://www.gsmworld.com/technology/gprs/index.shtml

:?:
Fact is I misunderstood you.
1 I ever bought a product intergating with MC35, which could attach to GPRS net and transmit data with other MT. That is to say, I think it is of my mistake, not the enviroment.
2 When I use Dial Network integrated in PC, with telephone number of *99***1#, and attachment of AT+CGDCONT=1,"IP","CMNET", the terminal can activate a PDP context. Then with a program using socket, I can get the local IP. I even supervised the data sent from 232 port, it includes AT ENTER, AT+CGDCONT=1,"IP","CMNET" ENTER, and then some data different from AT command, which I think may be PPP content. How do you think of it?
Here CMNET is the APN.
3 I am in China. I know little about GPRS, and with little data of MC35. I want to know how I can know whether I have a valid account(my SIM card is valid now)?
4 Thanks for your bearing with my low IQ

 

[Eclipsed]

You would have to have a valid account with China Mobile(I believe is your cell carrier).Meaning you would have to pay them for using the GPRS service.

 

[eduardorrodrigues]

Hi friend!
Sorry for my bad English, I am Brazilian.
The subject is, I use 1 module Siemens MC35i, and don't get to establish one connection in my provider in situation the Telecom Italia Mobile Brazil (TIM BRASIL).
Before me send any string I received 9 strings with multiple characters ascII, Sample:
~ÿ}#À!}!}#} }9}"}&} }*} } }'}"}(}"}%}&(?â}?}#}%Â#}%-c~

Are these sequences PPP?
When receive this string I return other string?
I using the Module MC35i in Hiper Terminal in serial port. These don't send commands alone. I will owe send some command?

Thanks.

Eduardo Rhowmert

 

[ArieSmit]

Same problem here

Hi Eduardo,

we have the same problem, it's weird and i've been struggeling for hours now.
I'm checking the dutch market now for an answere.

regards


arie