How to Change the Baud Rate of MOBITEK Q25 4G Modem

  1. By default, the baud rate for MOBITEK Q25 is “115200”.
  2. To change the baud rate of MOBITEK Q25 to another value and save it as default, MOBITEK Q25 needs to be connected to the PC using serial cable.
  3. Open Hyper Terminal, connect MOBITEK Q25 using “COM1” and set the baud rate to “115200”.
  4. Type “AT” in Hyper Terminal. If the response is “OK” then MOBITEK Q25 is successfully connected. If nothing can be entered in Hyper Terminal , then unplug and replug the serial cable to the serial port of the PC until “OK” is shown.
  5. In this example, the baud rate will be changed to “9600”. To do this, type “AT+IPR=9600;&W” in Hyper Terminal.

  6. At this point, nothing can be typed in Hyper Terminal because the baud rate setting has been changed from “115200” to “9600”.
  7. Disconnect MOBITEK Q25 from Hyper Terminal.
  8. Go to “File” -> “Properties”. In “Properties”, click on “Configure”. In “Port Settings”, change the baud rate to “9600”.
  9. Connect the MOBITEK Q25 to Hyper Terminal again. Enter “AT” and query the baud rate command. The baud rate should be changed to “9600”.