vb.net - Cannot send USSD GSM Modem -


i working sms application using vb.net , serial ports using gsm modem. checked following threads on site cannot answer problem. here's i've done 

at+cusd?  +cusd: 1  ok at+cusd=?  +cusd: (0-2)  ok at+cusd=1,"*102#",15  error

i changed message format pdu , text result stays same. show error.

please help.

first try :

at+cscs? mine +cscs: "pccp437"  ok

to know kind of encoding used. , know supported encoding modem :

at+cscs=? +cscs: ("ucs2","gsm","pccp437","pcdn","ira","8859-1","hex","utf-8")  ok

it return valid values encoding. set :

at+cscs="ucs2" ok

now command using ucs-2 encoding :

at+cusd=1,"002a0031003000320023",15

tell find?


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