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Connections, Display and Control Elements INSYS GPRS 5.0 serial
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13.3 Internal Design
For the INSYS GPRS 5.0 serial, a µcontroller is placed in series between the external
serial interface and the GSM/GPRS engine.
All commands sent to the INSYS GPRS 5.0 serial via the serial interface are first re-
ceived and evaluated by the µcontroller.
If the command results in just one action by the µcontroller, the response to the
application (e.g. OK) is created directly by the µcontroller.
If the GSM/GPRS engine is activated while commands are entered, the response to
the application is determined by the engine; in this case, the µcontroller will just
relay them.
During CSD calls or standard GPRS connections the µ controller relays the data
transparently in both directions.
When using the integrated TCP/IP stacks (TCP transparent) of the µ controller, the
data from the µ controller is packed into the according protocol elements, sent via
the GSM/GPRS engine and vice versa.
The periodically performed statu s queries (AT**GSMREQ ) and evaluation s of incomin g SMS occu r internally on another interf ace; th ey will not have an effect on th e commu nication between the a pplication an d the {{{PRO DUCT DESCRI PTION}}}.