Siemens TC63 Command Set page 262

TC63 AT Command Set
10.5 AT^SISR
(num)
<urcCauseId>
Indicates whether or not data are available for reading with AT^SISR.
0
1
2
TC63_ATC_V00.490
Confidential / Draft - Do not copy
No data available for reading.
New data are available and can be read by sending the
While the service is open this URC appears each time when new data are
available again. This eliminates the need to poll for fresh data.
Data transfer has been finished (all data have been read) and the service can
be closed with AT^SISC.
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AT^SISR
5/24/05