Electronic – Trying to find location in GSM network

at commandsgsm

I am using a GSM modem by Simcom SIM 800E. I'm interfacing it over the serial link.

I am passing command AT+CSCB to get the location. But I am not getting it. I just get the response OK.

Can someone tell me the correct way to use this command?

The modem works fine while sending and receiving SMS.

Best Answer

AT+CSCB is to "Select Cell Broadcast SMS Messages" - not to get a location: (datasheet, p. 70)

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What you can try is explained here. First send the Test Command, AT+CSCB=?. You should get a response with a list of supported modes. Then you can try the Read Command, AT+CSCB? and you should get the current mode and so. At last you can try a Write Command, AT+CSCB=<mode> with <mode> one of the modes listed in the response to the Test Command. You can verify this change with the Read Command AT+CSCB?.

When you do want a location, try what PeterJ says in the comments on the question: send a AT+CENG=2. This sets the engineering mode (whatever that may be) and replies with all kinds of network information. Refer to the datasheet for an exact list, but it would include:

< mcc > : mobile country code
< mnc > : mobile network code
< bsic > : base station identification code
< lac > : location area code

With the bsic, you can use this to find your location. Other return variables may be useful as well.

Related Solutions

Electronic – GSM Modem will not register to network

Solution is to reflash SIM900A with SIM900 software and it works like a charm.

Here is the page that shows the solution.

Flashing is no trickery, just a right sequence of operations, there is detailed instruction for arduino-like approach, my way required just a few major steps:

Power up your SIM900A module to respond to AT commands in auto-baud mode (AT+IPR=0). It means you must wire powerlines, do power-on sequence with PWRKEY etc.

Setup flashing tool — connect it to SIM900A, set default speed of 460800 baud, choose firmware to flash from unpacked RAR file, select “don’t check file name” check-box and press “start download” button to see “Power On/Reset Target” message.

Short NRESET (pin 16) to GND for a moment. Right after it reboots flashing tool will start pushing data.

When flashing ends with “Download complete” power off SIM900A module. Note that reset will not work, disconnect power line and start power-on sequence once again.

Voila! It works now as expected. PIN accepted, logged in to network and test text message successfully sent to my smartphone.

Thanks everyone for helping out!

GPRS HTTP 400 Bad request

I solved the problem. :) The problem was with Extra "Space" in header.

sprintf(DataToSend, "GET %s HTTP/1.1\r\n Host: %s\r\n\r\n", PATH, HOST);

I removed that space:

sprintf(DataToSend, "GET %s HTTP/1.1\r\nHost: %s\r\n\r\n", PATH, HOST);

and then problem get resolved. here is the response from server:

HTTP/1.1 200 OK
Date: Fri, 19 Jun 2015 03:38:14 GMT
Server: Apache
X-Powered-By: PHP/5.4.34
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Last-Modified: Fri, 19 Jun 2015 03:38:14 GMT
Vary: Accept-Encoding,User-Agent
Content-Length: 87
Content-Type: text/plain

This is REQUEST Data
data1:value1
This is GET Data
data1:value1
This is POS
           HTTP/1.1 200 OK
Date: Fri, 19 Jun 2015 03:38:14 GMT
Server: Apache
X-Powered-By: PHP/5.4.34
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Last-Modified: Fri, 19 Jun 2015 03:38:14 GMT
Vary: Accept-Encoding,User-Agent
Content-Length: 87
Content-Type: text/plain

This is REQUEST Data
data1:value1
This is GET Data
data1:value1
This is POS
           T Data

Thanks guys.

Best Answer

Related Solutions

Electronic – GSM Modem will not register to network

GPRS HTTP 400 Bad request

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