COM Port Number of MOBITEK S80 Modem Will Change If USB Port is Changed

MOBITEK® S80 for SMS Over 3G Network

 

OBJECTIVE: to test if restarting Windows 10 causes COM port number of MOBITEK S80 SMS Modem to change.

 

TEST METHOD TEST RESULT
  1. Use MOBITEK S80 (no SIM card required)
  2. Use your Lenovo laptop running Windows 10
  3. Connect S80 into USB port no. 1
 What is the COM port number?

COM 9
  • Restart Windows 10
 What is the COM port number after restart?

COM 9

Does COM port number change after restart?

NO
  1. unplug S80 from USB port no. 1
  2. plug into USB port no. 2 (different one)
  What is the COM port number?  COM 7
  • Restart Windows 10
  What is the COM port number after restart? 

COM 7

Does COM port number change after restart?

NO

CONCLUSION

Restarting Windows 10 doesn’t change the COM Port Number.

It is common that that the COM port number will be changed if you plug the modem into another USB port. As long as that MOBITEK S80 is using the same USB port, COM port number will be the same.