Specifications

MC55 AT Command Set

9.14 AT+CUSD

MC55_ATC_V03.03 Page 217 of 459 9/9/05

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String type USSD-string (when <str_write> parameter is not given, network is not interrogated).

For the write command, only <dcs>= 15 is supported.

String type USSD-string .

If <dcs> indicates that GSM 03.38 default alphabet is used TA converts GSM alphabet into current TE character

set according to rules of GSM 07.05 Annex A. Otherwise in case of invalid or omitted <dcs> conversion of

<str_urc> is not possible.

GSM 03.38 Cell Broadcast Data Coding Scheme in integer format (default 15). In case of an invalid or omitted

<dcs> from the network side (MT) <dcs> will not be given out.

0 No further user action required (network initiated USSD-Notify, or no further

information needed after mobile initiated operation)

1 Further user action required (network initiated USSD-Request, or further infor-

mation needed after mobile initiated operation).

If <m>=1, then the URC ends with ">" to prompt the user for input. The user

action is finished with

<CTRL-Z> or aborted with <ESC>.

2 USSD terminated by network.

Notes

• When a USSD string is sent via ATD, a "AT+CUSD=1" is executed implicitly.

• It is recommended to finalize or escape a pending USSD user interaction before further actions are done to

prevent blocking situations.

<str_write>

(str)

<str_urc>

(str)(+CSCS)

<dcs>

(num)

<m>

(num)