Vega INSYS Modem GPRS 5.0 Bedienungsanleitung PDF herunterladen (Seite 43)

INSYS GPRS 5.0 serial Connection

If the test is successfully performed, the message "+PPP-IP OK" is displayed.

If the test fails, the GPRS connection is terminated (message +PPP-IP RELEASE) and

the TCP Listen mode is reestablished.

To save costs if there is a problem with availability, the waiting time between the

repeat attempts will grow for each subsequent attempt.

 20 seconds after restart or if the last connection setup was successful

 80 seconds after the first failure

 320 seconds after the second failure

 1280 seconds after the third failure

 1 hour for each additional failure

The number of dialing attempts for the TCP Listen operation can be limited with

AT**TCPLISTENWAITRST=<n>. For example, the INSYS GPRS 5.0 serial is re-

started with AT**TCPLISTENWAITRST=3 after the third dialing attempt

(20s+80s+320s). This will restart the dialing cycle. The default value for this set-

ting is 255.

Note

This setting increases the availability of the INSYS GPRS 5.0 serial

and its application. However, the increased number of dialing at-

tempts that are performed shortly one after the other, higher con-

nection costs may occur. This depends on the terms of the contract

with the mobile network provider.

The INSYS GPRS 5.0 serial offers systems with dynamic IP addresses the option to

communicate the IP addresses allocated by the provider during the current GPRS

dial-up into TCP Listen ((+PPP-IP SETUP) to a server. More in Chapter "6.10 Virtual

COM Port".

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Vega INSYS Modem GPRS 5.0 Bedienungsanleitung Seite 43