The source is located in my Github repository at I wrote a simple command line utility with Visual Studio C++ that can be used to send a command string to a serial port. This description appears to apply to how this AT command is generally implemented by USB cellular modem providers. TheĪT+CFUN=1 command restarts the entire GSM stack and GSM functionality: Then a power on will automatically restart the whole GSM process.
If the mobile equipment is turned off after this command, (AT+CFUN=1) will have to issued to restart the whole GSM registration If the mobile equipment is not powered off by theĪpplication after this command has been sent, a re-start command Internal parameters in SIM and in EEPROM. ThisĬommand executes an IMSI DETACH and makes a backup copy of some Procedure, then it must send: AT+CFUN=0 (equivalent to AT+CPOF). The application wants to stop the product with a power off, or if theĪpplication wants to force the product to execute an IMSI DETACH This command selects the mobile station’s level of functionality. After using the command a second time after a few seconds wait, the displayed status showd the PANTECH UMO290 up and running.įor a fuller description of the AT+CFUN=0 command see page 12 of AT Commands GSM Reference Guide from MultiTech Systems which has this to say: I used the ipconfig /all command to display the status of the LAN adapters in my system. I then used AT+CFUN=1 to turn the USB modem back on. Then I used ipconfig /all to examine the LAN adapters in my system which showed the PANTECH UML290 as "Media disconnected". I then used AT+CFUN=0 to turn off the USB modem. For Windows 7 and later see HyperTerminal Alternatives for Windows 7. The HyperTerm application is an older modem and serial ports application that came with Windows XP and earlier. Next I used the HyperTerm application to open a connection to the Virtual Serial Port assigned to the USB modem as shown in Device Manager. I used the Device Manager application from the Control Panel to find the USB modem and to then see what COM port it was using. I used the following procedure to test with a PANTECH UML290 USB cellular modem with Verizon as the carrier.įirst step was to determine the Virtual Serial Port in use through which I would send the AT commands. The AT command must be terminated by a carriage return and it must be sent through the Virtual Serial Port that is assigned to the USB modem. To turn the modem off use: AT+CFUN=0 and to turn the modem on use: AT+CFUN=1. There seems to be a generally used or defacto standard AT command for turning off and turning on a USB cellular modem.
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