R&D department
2018/08/01
Answer: https://www.google.com/maps/?q=54.7413016,25.2227550;54.7413016,25.2227550;0x4C5455313233343536
373839303132333400000000000000;11659;2016-12-13 11:20:02;#05
If some requested IO is not enabled in configuration or some tag is unknown, then the device will reply: NA
Example: pass info time;imei;eng;IO29;lktma
Answer: 2016-12-13 12:41:57;865789021340700;0;NA;NA
1.1.41 USSD command
GSM network operators are providing various services via USSD communication. Support of the USSD commands
allows users to send various USSD request to the GSM operator over the FM device and receive answers. In this case the
device operates in the transparent channel principle.
Operation principles
• USSD command is received through the SMS and then passed to the modem;
• USSD command is not affected or ignored by ongoing firmware, configuration updates or tacho and smart card
reading.
• After getting the response, the device transmits the answer to the sender of the SMS;
• Timeout of 120 seconds is used when waiting for the response from the GSM operator.
SMS command
Request SMS structure: pass ussd *command#
Where command is a set of digits and asterisk symbols (*). Command always begins with an asterisk symbol *
and is terminated by #. Inside, the command can have several asterisk symbols.
Correct command examples:
*485#
*52*452*4#
Incorrect command examples:
52# - missing *
*45 - missing #
*5 65# - blank space in the command
Responses
• When the operator responds to the ussd command within 120 seconds, the answer is sent in the following
format: ussd response
• If * or # symbols are missing or command is blank in the request message: ussd bad format
• If the response is not received from the operator within 120 seconds: ussd timeout
• If there is an error with the GSM network operator: ussd modem error
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