Question

At Command GSM to GSM connection

Asked by: jendy

Hi,

I am wanting to make a connection between two GSM modems.

Both sim cards are data enabled.

I am currently trying out the AT Commands in hyper terminal but am not sure which to use.

The sim cards are not GPRS enabled so CSD data transfer??

Please advise what the AT Commands are to;

1. Connect Modem A with Modem B
2. Recieve file or data log
3. Send file

Please include exact code i.e when to press ENTER etc

Many thanks
Jendy

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Asked On
2005-11-09 at 06:20:24ID21624731
Tags

gsm

,

command

,

data

Topic

Global System for Mobile Communications (GSM)

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: imarshadPosted on 2005-11-09 at 20:53:08ID: 15262917

Establishing a data call is really simple.... On the receiving modem you will need to issue.....

ATS0=1 <Enter>          'This will set the modem to autoanswer after 1 ring.

Now on the Calling Modem you will simply issue

ATDXXXXXXXXX<Enter>

where XXXXXXXXX is the data number which you want to dial....... Please remember in most of the cases this data number is different from your voice number.....
Also note that there is no Semi-colon ";" in the dial command. ATD command with a Semi-colon will place a Voice call while without a Semi-Colon it will place a data call.... Now your modem will reply with  "Connected at 9600" or similar response. Now whatever you type on the serial port (Hyper terminal in this case) will be tranmitted to the other end. You can also send a file as well... To disconnect the call simply write ATH or +++ on the port and you will get disconnected.... I hope this info is helpful for you......

Imran
 

 

by: MeffPosted on 2005-12-01 at 23:30:24ID: 15403007

Please feel free to visit http://www.gsm-modem.de/gsm-modem-faq.html .
It explains you the AT commands you need to make a data call.
Please feel free to read http://www.gsm-modem.de/gsm-data-call.html as well.
Multi numbering
If you want to receive data and/or fax via GSM, you must get and use the incoming numbers  provided by your GSM network. You will thus have separate incoming numbers for Voice (your  current cellphone number), Data 9,600 baud, Data 2,400 baud, and Fax  9,600 baud.

Someone sending you data or fax will thus have to dial one of these incoming numbers to do so. To send you a fax via GSM, they must thus use your incoming fax number etc.

The reason for this additional numbering that not all the analogue fixed line  exchanges/switches can process and route the digital data that the digitally based GSM networks and cellphones use.

Single numbering
A few, but not all GSM networks offers single numbering. The you will have one number  for all different kind of calls like in a landline based ISDN application. The kind of the call is digital coded. Mostly it is not needed in industrial mashine to mashine  communication. Single numbering can make trouble if you have designed your application  local  based on multi numbering and your client is supported by GSM operators that offers single numbering only.

Regards
Meff
www.gsm-modem.de

 

by: jendyPosted on 2005-12-07 at 05:11:59ID: 15435640

Hi imarshad,

Thanks for your comments.

I can make a connection ok now thank you.

Could you tell me the commands to transfer a file?

To clarity, I have two GSM modems (Gm29).

One is in a remote location in a tracking device. The tracking device stores data on in one main file.

I would like to transfer the black box or main file from the tracking device.

So, what commands can I issue from the base modem to request the file from the remote modem?

Many thanks
john

 

by: MeffPosted on 2006-01-12 at 23:23:23ID: 15689486

> Could you tell me the commands to transfer a file?
File transfer you can do by CSD with the protocol Z-Modem.
If you move to the GPRS terminal listed on http://www.gsm-modem.de/gsm-modem.html then you can use easy the FTP protocol, because it comes with embbeded TCP/IP stack and embbeded FTP protocol as well.
Regards
Meff

 

by: imarshadPosted on 2006-01-15 at 21:00:35ID: 15708211

>>So, what commands can I issue from the base modem to request the file from the remote modem?

Once you have connected using CSD i.e using data call then you will have a serial channel directly established between the two modems... i.e whatever you type on the serial port of one modem it will be received on the serial port of other modem...... If your devices are Computers then you can use the builtin facility of hyper terminal to send receive files.... If one of them or even both are microcontroller based devices then you can develop your own protocol of file tranfer which includes transfer of bytes.....

Imran

20120131-EE-VQP-002

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