insys icom GPRS 5.1, Руководство пользователя, Страница: 98 / 102

Connections, Display and Control Elements INSYS GPRS 5.1 serial
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13.3 Internal Design
For the INSYS GPRS 5.1 serial, a
µ
controller is placed in series between the external
serial interface and the GSM/GPRS engine.
All commands sent to the INSYS GPRS 5.1 serial via the serial interface are first re-
ceived and evaluated by the
µ
controller.
If the command results in just one action by the
µ
controller, the response to the
application (e.g. OK ) is created directly by the
µ
controller.
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
µ
controller 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.