I am using SIMCom 800C module to get the location through cell broadcast messages. When I am executing command AT+CSCB=0,\"50\",\"0-9" , I get the response 'invalid input value'. If I put in this format as provided over Internet AT+CSCB=0,"50","0-9" I get the response +CMS ERROR: unknown<CR><LF> This is the whole format in which I executed the commands:


Please provide me a solution to this problem.

  • \$\begingroup\$ Please link to the datasheet for this device. Also, confirm if any commands are interpreted without error. \$\endgroup\$ – Sean Houlihane May 23 '16 at 14:08

Table with command description from SIM800 Series_AT Command Manual_V1.09, that you can get just by register on manufacturer's site, is placed bellow. Of course, all very confusing: total 5 different <dcss> can be supported but AT+CSCB? show 21 selected <dcss> at a time by default. In practice I could not change <dcss> list but <mids> list easy to change by commands described in last row of table.

As I understand default list of <dcss> = "0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,32,33,34,35,36,15" is enought for you purposes. So you can change only list of <mids> with command AT+CSCB=0,"50".

manual part1 manual part2 manual part3


This is example of successful configure:

SIM800C at-commands exchange screenshot

  • \$\begingroup\$ please find below the link for the attempts that i make but still unsuccessful. goo.gl/photos/vCXoj3q41aGV12C99 . please do suggest what can be the reason for this. my main motive is to fetch the location from cell broadcast messages. \$\endgroup\$ – pranjal khanduri May 24 '16 at 10:15
  • \$\begingroup\$ just use AT+CSCB=0,"50" without <dcss> field. Result of configure you can check with AT+CSCB? it will response by default +CSCB=0,"","0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,32,33,34,35,36,15" and after configure +CSCB=0,"50","0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,32,33,34,35,36,15". As I understand it's well enough. \$\endgroup\$ – imbearr May 24 '16 at 11:04
  • \$\begingroup\$ @pranjalkhanduri, I have add example of command use, with results of configure. \$\endgroup\$ – imbearr May 24 '16 at 11:14
  • \$\begingroup\$ sir i followed the steps that u provide but still error is coming,but when i changed my sim card (another service provider) its automatically gives me the location message. goo.gl/photos/2msoe8K2P7fSM5Bx5 .kindly help me out in figuring the values that i have to feed manually to get this message manually. goo.gl/photos/uZsYodReHUz8Ss8s6 \$\endgroup\$ – pranjal khanduri May 24 '16 at 12:30
  • \$\begingroup\$ @pranjalkhanduri, you have deservedly get down vote to your question! This IS RESPONSE: +CSCB=0,"","0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,32,33,34,35,36,15" Use only this command: AT+CSCB=0,"50" \$\endgroup\$ – imbearr May 24 '16 at 12:38

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