Siemens TC63 - Manual (Page 262)

TC63 AT Command Set
10.5 AT^SISR
s
TC63_ATC_V00.490 Page 262 of 501 5/24/05
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Indicates whether or not data are available for reading with
AT^SISR
.
0 No data available for reading.
1 New data are available and can be read by sending the
AT^SISR
command.
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.
2 Data transfer has been finished (all data have been read) and the service can
be closed with
AT^SISC
.
<urcCauseId>
(num)