Specifications

Telit GM862-PCS/-GPRS/-GSM Product Description

1vv0300604, Rev. ISSUE#14 - 22/01/04

- GM862-GPRS establishes a TCP/UDP (depending on the parameter request) connection with

the given internet host

- Once the connection is up the module reports the code: CONNECT

From this moment the data incoming in the serial port is packet and sent to the Internet host, while

the data received from the host is serialised and flushed to the Terminal Equipment.

6.9.2.5 Close the Socket and deactivate the context

The connection can be closed because of:

- remote host TCP connection close

- socket inactivity timeout

- Terminal Equipment by issuing the escape sequence "+++"

- Network deactivation

Note: if in the raw data to be sent there's an escape sequence, then the TE must work it out and sent

it in a different fashion to guarantee that the connection is not closed.

The pause time is defined in the parameter S12.

On the reception of an escape sequence the GM862-GPRS closes the connection, deactivates the

GPRS context returning to command mode and issuing the NO CARRIER code.

6.9.3 Known limitations

The implementation of the EASY GPRS feature has the following known limitations:

- Only one socket can be opened at a time, no multiple socket connections can be made;

- Only the first GPRS context is associated with this feature;

- The closing of a socket implies always the deactivation of the GPRS context associated;

- It is taken for granted that external processor will be able to handle at least a limited v.24

implementation: RTS, CTS and, highly recommended, DCD lines; this because software flow

control is not applicable to the feature;

- Only Mobile initiated connections can be made, it is not possible to receive incoming TCP

connection requests;

- Due to the particularity of this feature, the flow control of both the directions uplink and

downlink is interlocked