Reading Interval; Syntax - insys icom GPRS 5.1 serial Manual

Functions
Alternatively, automatic SMS processing can be set, changed or
deleted using the terminal program.
Each incoming SMS is deleted after it has been processed.
Only incoming SMS messages with a command to the INSYS
GPRS 5.1 serial are deleted, remote SMS are left in the buffer.

6.5.2 Reading Interval

The reading interval can be set from 20 to 60 seconds.
Alternatively, the GSM reading interval can be
changed using the terminal program.

6.5.3 Syntax

SMS intended for the INSYS GPRS 5.1 serial must have the follow-
ing syntax:
[<password>,]<command>[,CN: [<callbacknumber>]]
Detailed explanation:
56
Note
Due to different GSM/GPRS network structures it may occur that
the provider cannot deliver any SMS to the GSM/GPRS engine while
data packets are sent/received via GPRS (this relates to standard
GPRS calls and "TCP transparent" calls via GPRS).
Experience shows that an SMS is only sent during data transmission
breaks longer than 30 seconds.
INSYS GPRS 5.1 serial
AT**SMSRX=1
AT**SMSRX=2
AT**GSMREQ=<n>