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pisoiu
Joined: 31 Dec 2002
Posts: 900
Helped: 24
Location: Romania
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 12 Jan 2006 16:04 GSM 900/1800 module |
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Techie, can you give me some info about M22 (price, supplier)? I am also interested in a cheap module at 1k units, with TCP/IP stack. I know that there are some previous comments about this issue, but they may be outdated.
/pisoiu
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 12 Jan 2006 16:22 GSM 900/1800 module |
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| M22 is about $50 in single quantity from China. I dont know about qty pricing. I think it should be arount $30-35.
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moo82
Joined: 12 Jan 2006
Posts: 10
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| 12 Jan 2006 16:24 Re: GSM 900/1800 module |
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i also had a question
is there a flash/ram memory on M22 (i think yes) ?so if yes can,wath 'is its volume and can i use it to stock some information or a programme?.
Thank you
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 12 Jan 2006 16:27 GSM 900/1800 module |
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| I doubt it. I have not used the M22 yet. I have read it though. How much flash do you need. You can use a cheap EEPROM like 24C16 if you want to store some data.
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moo82
Joined: 12 Jan 2006
Posts: 10
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| 12 Jan 2006 16:50 Re: GSM 900/1800 module |
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30-35 is too cheap. but 40-45$ is the cheapest price you could have for 1K unites
Added after 8 minutes:
the fact is that i use an SDC before the GSM module and i want to diminuate the RAM and FLAsh memory.in fact I need 1Mo flash and 16Mo RAM
Added after 12 minutes:
SDC=SBC (sorry)
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 12 Jan 2006 17:27 GSM 900/1800 module |
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| That is quite a lot of memory for an embedded application. No I dont think M22 will provide you with this.
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 18 Jan 2006 12:10 Re: GSM 900/1800 module |
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Question:
In M22 GPRS, When you connect to a webserver by ATD*97#, you get a socket connection, right. Can you then simple send / receive packets over the socket connection. For example I want to download a webpage and I am connected to TCP port 80 of a web server. Can I send a GET ... command and receive the webpage in response.
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artem
Joined: 22 May 2003
Posts: 1650
Helped: 90
Location: Turan
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| 19 Jan 2006 16:40 GSM 900/1800 module |
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I did not use the M22 for GPRS , i am planning to do so, but will try my best .
look at the atd command details :
D*<GPRS_SC>[*[<called_address>][*[<L2P>][*[<cid>]]]]
L2P possible values state that :
0 NULL
1 PPP
2 PAD
3 X25
That means you cant use direct get http command as
after the ATD is executed you should work with ppp protocol . So your ppp ip tcp protocols must be in place . You http protocol must be encapsulated into tcp/ip then into ppp then you can send these encoded data to the modem. Of course there will be connection establishment sequence on tcp level for remote socket .
I did not use the TCP builtin stack but at the page
279 of M22 AT commands document :
"2.8 M2M: Machine to Machine
The M2M AT command provides TCP/IP socket over GPRS connection.
These AT commands are only available in the M2M firmware."
that means you should use proprietary commands stated there to use internal builtin tcp stack of m22 . But document states that commands are applicable to M2M firmware . i do not know the version of software supporting M2m , it has to be asked from BenQ . If your modem firmware does support you can start with commands on mentioned page .
Good learning apprach - is to try to use modem directly from your PC by initiating internet dialup network - connect your modem to PC serial port and define new connection with dial number equal to *97# . At dialing you should be able to establish gprs connection and ppp network connection . BTW you can plug the serial link monitor to see what is going on on serial line . Or better try to capture data by etherial and decode them on ppp level . That will help you much to . So you can access the page using windows browser and compare that what is your software are doing with phone .
The issue with protocols is described here
http://edaboard.com/viewtopic.php?t=63145&highlight=gprs+source
Someone posted here code for PPP GPRS call .
http://edaboard.com/viewtopic.php?t=64095&highlight=gprs+source
i dont trust to this source , but you can give a try .
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 19 Jan 2006 18:35 GSM 900/1800 module |
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| The windows dialup networking works fine with M22. THe command is *99***1#. I can then download the web-page also. But THe problem is when I use the built-in TCP/IP stack. Then while I can connect with the server, I cannot get a response of my GET commands.
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clivechen
Joined: 29 May 2004
Posts: 65
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| 14 Feb 2006 2:14 Re: GSM 900/1800 module |
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| I give you the cheapest module: SIMCOM 100 or SIMCOM 300 they are only less than $20
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 14 Feb 2006 5:35 GSM 900/1800 module |
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1. Have you used them for reliability.
2. Do they have GPRS and TCP/IP stack.
3. Any links to their website, distributors, sales etc
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moo82
Joined: 12 Jan 2006
Posts: 10
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| 15 Feb 2006 16:27 Re: GSM 900/1800 module |
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Thank u clivenchen,
Could u please give me a supplier who could give me a quick quotation
thank u
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gorkin
Joined: 27 Feb 2002
Posts: 591
Helped: 8
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| 15 Feb 2006 16:43 Re: GSM 900/1800 module |
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SIM web site: http://www.simcommunication.com
Here You find more about sales agents.
Gorkin.
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 15 Feb 2006 19:26 GSM 900/1800 module |
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| The question remains. Has anyone used these for reliability.
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moo82
Joined: 12 Jan 2006
Posts: 10
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| 16 Feb 2006 13:41 Re: GSM 900/1800 module |
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Dear gorkin,
did they give you a quotation for the sim300 for 20$.In fact the Sim 100 they don't make it anymore
thank you
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moo82
Joined: 12 Jan 2006
Posts: 10
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| 21 Feb 2006 18:40 Re: GSM 900/1800 module |
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Dear all,
Did somebody know if SIM300 is ROHS compliant???
Thank you
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tramp
Joined: 06 Aug 2005
Posts: 80
Helped: 1
Location: india
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| 23 Feb 2006 18:35 Re: GSM 900/1800 module |
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Hi,
I am beginer for using module.I have a problem about sim100 modem.It get power on properly but not get register to network.what could be probable cause.Does it require to follow an initilisation sequence to follow?
Thanks in advance.
tramp
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 24 Feb 2006 15:28 GSM 900/1800 module |
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The GPRS module have modem control pins like RTS CTS etc. I dont want to use them. Can I just leave these alone or loop them in a null modem style.
Any suggestions welcome.
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ashish.agarwal
Joined: 28 Feb 2006
Posts: 1
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| 03 Mar 2006 15:58 Re: GSM 900/1800 module |
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I have used Wavecom and SIMCOM modem. There is some problem of delay messaging in SIMCOM.
--Ashish
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pisoiu
Joined: 31 Dec 2002
Posts: 900
Helped: 24
Location: Romania
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| 03 Mar 2006 16:20 Re: GSM 900/1800 module |
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| techie wrote: |
The GPRS module have modem control pins like RTS CTS etc. I dont want to use them. Can I just leave these alone or loop them in a null modem style.
Any suggestions welcome. |
These pins are used only if you choose to do so, using hardware flow control. Take a look at AT commands concerning hardware flow control (AT&K, AT+IFC), set all to disable, and all you have to do is to play with RX and TX, leaving everything else. However, if you do GPRS communication, I highly reccomend you to use flow control (either hardware RTS/CTS or software XON/XOFF). Depending on the network conditions, if you send large ammounts of data, the modem may not be able to keep up with your mcu, and without flow control, you may loose data.
/pisoiu
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techie
Joined: 05 Feb 2002
Posts: 833
Helped: 42
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| 03 Mar 2006 17:07 GSM 900/1800 module |
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| Thanks pisoiu. I dont have many pins for flow control. TO avoid any data loss, I am using a smaller baud rate (19200) and the amount of data sent to GPRS module is very small. The received data is large however. But I dont fear my microcontroller missing anything as I am using a larger fifo buffer.
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tramp
Joined: 06 Aug 2005
Posts: 80
Helped: 1
Location: india
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| 03 Mar 2006 17:50 Re: GSM 900/1800 module |
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| ashish.agarwal wrote: |
I have used Wavecom and SIMCOM modem. There is some problem of delay messaging in SIMCOM.
--Ashish |
Hi Ashish
Did u used SIM100S32-E modem?There is a problem with sim100 datasheet i refering.PIN dicription of pin 15 & 16 in GND but in circuit dia these pins are Vana & V bat (ext) what is the funtion of these pins?What is basic interfacing requirement to get modem connected in transparent mode?
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bbtjacking
Joined: 23 Feb 2004
Posts: 27
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| 05 Mar 2006 23:21 GSM 900/1800 module |
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| Can u tell me which module from wavecom
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xingyu
Joined: 01 Aug 2004
Posts: 1
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| 30 Mar 2006 15:34 Re: GSM 900/1800 module |
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| Any body know how to get SIMCOMM module in EU?
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tramp
Joined: 06 Aug 2005
Posts: 80
Helped: 1
Location: india
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| 30 Mar 2006 16:52 Re: GSM 900/1800 module |
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| xingyu wrote: |
| Any body know how to get SIMCOMM module in EU? |
what is EU?
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pisoiu
Joined: 31 Dec 2002
Posts: 900
Helped: 24
Location: Romania
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| 30 Mar 2006 19:22 GSM 900/1800 module |
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European Union.
I've purchased modems directly from them, it seem that there are no distributors for EU.
/pisoiu
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tramp
Joined: 06 Aug 2005
Posts: 80
Helped: 1
Location: india
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| 01 Apr 2006 9:07 Re: GSM 900/1800 module |
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Hi,
http://www.excelpoint.com is the distributer for simcom but they don't have office in EU. U can send qurrey to Steven.Liu(at)ExcelPoint.com.sg for that.
tramp.
Is there any cost difference between M22 & M32 module from benq?
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aNdreiBuuu
Joined: 30 Apr 2001
Posts: 387
Helped: 11
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| 01 Apr 2006 20:11 Re: GSM 900/1800 module |
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| Quote: |
| Is there any cost difference between M22 & M32 module from benq? |
Yes it is around 6-7USD (M22 is cheapest than M32)
regards,
//a
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potetojb
Joined: 25 Feb 2006
Posts: 63
Helped: 1
Location: Johor,Malaysia
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| 03 Apr 2006 13:01 Re: GSM 900/1800 module |
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how if i want build the gsm modem.
can someone help me..
in my country the modem is very expensive...
so i thing i want build the low cost modem..
the modem only for send and receive msg and support at command
thank for help.
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tramp
Joined: 06 Aug 2005
Posts: 80
Helped: 1
Location: india
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| 04 Apr 2006 13:31 Re: GSM 900/1800 module |
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Hi,
Sim100 from simcom is going to absolute in mar06 & sim300 is going to be replace it.Did anybody have sim300 modem datasheet?
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