SDAA112 September   2025 AM625

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Use Case
  5. 2Platform and Products
    1. 2.1 Hardware
    2. 2.2 Software
  6. 3Methods
  7. 4Overview of Steps to Bring Up the Interface and Establish A Connection
  8. 5Troubleshooting
    1. 5.1 Power and Initialization First
    2. 5.2 Verify Network Before PPP
    3. 5.3 Test Manual Dial First
    4. 5.4 Timing When Dialing Up
    5. 5.5 Serial Communication
    6. 5.6 Chat Script
    7. 5.7 PPP Options
    8. 5.8 Signal Strength and Antenna Setup
    9. 5.9 Modem Reset
  9. 6Summary
  10. 7References

5.9 Modem Reset

If the modem consistently fails to register to a network or loses responsiveness, a reset can be required. Conditions that warrant a reset include:

  • Failure to register after several minutes (AT+COPS? and AT+CEREG? never indicate success).
  • Failure to register even after a full network scan (AT+COPS=?).
  • Continuous reports of no signal (AT+CSQ = 99,99 or AT+QNWINFO = No Service).
  • Loss of responsiveness to AT commands after a PPP session ends.

Reset options include:

  • AT command reset: AT+CFUN=1,1
  • Hardware reset via GPIO toggling, for example
    • gpioset --mode=exit $(gpiofind MIKROBUS_GPIO1_12)=0
    • gpioset --mode=exit $(gpiofind MIKROBUS_GPIO1_12)=1