One thought on “SMS-PDU

  1. Q:

    I would use 8bits and PDU mode to send SMS , but when I set
    "AT+CSMP =x,x,x,y" ,y=25 ,0,4,240~243. The GPRS module responses error
    code :303. How can I deal with it?



    The "AT+CSMP=x,x,x,y"
    command applies only to the SMS TEXT mode.  It does not apply to the PDU
    MODE. In PDU mode all the SMS parameters are enclosed in the PDU.
    Therefore, you don’t have to send the AT+CSMP command if you work in PDU