INSYS EDGE 5.0 Series, Руководство пользователя

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INSYS GPRS/EDGE 5.0 serial Connection
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5.5.2 Connection Setup Possibilities
Manual connection setup
In case of a manual connection setup (command
ATD<IP address>:<port>
or
ATD<“domain name“>:<port>
), a connection to the GPRS network (GPRS At-
tach) is performed first. After the connection with the GPRS network has been es-
tablished, a TCP connection to the specified IP address or domain will be estab-
lished via the specified port.
Leased line connection
In leased line operation, a connection with the GPRS network (GPRS Attach) will be
performed after starting the device. After the connection with the GPRS network
has been established, a TCP connection to the configured remote terminal will be
established. The behaviour in case of an unsuccessful connection setup is con-
trolled by the parameter
<mode>
of the command
AT**LLWAITRST=<attempts>,<mode>
. If the mode = 1, only the TCP connec-
tion will be disconnected following each unsuccessful connection setup. The GPRS
connection remains established, the IP address remains valid and the data volume
incurred will not be charged and summed up. When reaching the maximum
number of attempts (parameter
<attempts>
), the device will be restarted. If the
mode = 0, the TCP connection and the GPRS connection will be disconnected fol-
lowing each unsuccessful connection setup. The IP address will be returned and
the data volume incurred will be rounded to the full data block and charged.
When reaching the maximum number of attempts (parameter
<attempts>
), the
device will be restarted
TCP listen operation
In TCP listen operation (
AT**TCPLISTEN=1
), a connection to the GPRS network
will be established after starting the device (GPRS Attach). After the connection
with the GPRS network has been established and an IP address has been assigned,
the TCP port will be monitored for a connection request with the own IP address.
If this connection request is detected, a TCP connection will be established.
5.5.3 Connection Termination
In case of an intended connection termination, the TCP connection and the GPRS
connection will always be disconnected.