Read the following documentation for more information:

• Huawei MU609 miniPCIe Hardware guide.
• Huawei MU609 miniPCIe AT command spec.
• Huawei MU609 miniPCIe Application guide.

• ttyUSB0: MODEM port: simulated using USB, for AT command interaction and establishing data connection.
• ttyUSB1: DIAG port: simulated using USB, for DIAG (diagnostic) command interaction (mainly used to debug modules at present).
• ttyUSB2: PCUI port: simulated using USB, for AT command interaction only.
• ttyUSB3: GPS NMEA port: simulated using USB, sending unsolicited indications for NMEA positioning data only.
• ttyUSB4: GPS Control port: simulated using USB, for GPS AT command interaction only.
• eth3: ECM port: for establishing communication connection.

• Connect to the device:

  screen /dev/ttyUSB0 9600

• optional: Reset the mobile terminal (MT). Wait for the MT to come back and reconnect:

  at+cfun=1,1

• optional: System configuration, you need to set CS or CS_ONLY, CS = circuit switched. If you want to set up a dataconnection, configure CS_PS. PS = packet switched. If you don't include CS, you will receive an error: +CMS ERROR: 500.

  at^syscfg=2,2,3FFFFFFF,1,2

• Check if SIM is ready or needs to be unlocked:

  at^cpin?
  at^cpin=1234

• Are we registered to the network?

  AT+COPS?

• Configure message format, text mode:

  at+cmgf=1

• Set text mode parameter (GSM):

  at+csmp=,,,0

• Set SMS service center number:

  AT+CSCA="+31653131313"

• Set Terminal Equipment (TE) character set:

  at+cscs="GSM"

• Send message to number:

  at+cmgs="+31612345678" <enter>
  text text <ctrl-z>