001-0003-829 Revision 1
Page 51 of 65
•
The TCP/IP stack of TC65 supports using several service profiles at the same time, provided all of
them are running on the same connection profile. For example, it is possible to download files
from an FTP server, while sending and receiving emails at the same time.
•
GPRS connections established over the Dial-Up Network do not use the embedded TCP/IP stack of
TC65 and can be active at the same time. This allows the user to have two parallel GPRS
connections: for example, for sending or receiving emails over a GPRS connection enabled by the
TCP/IP stack while, at the same time, surfing the Internet over a Dial-Up Network GPRS
connection.
Address notation
Server addresses must be provided as IP addresses in standard dot-format (e.g. "192.168.1.2") or
as server address names resolvable by a DNS server (e.g. "smtp.myserver.de" or
"pop3.myserver.de").
Inactivity timeouts
Inactivity timeouts are not part of the Internet AT command functionality implemented in the
modem and, if desired, are the responsibility of the host application. It is recommended that the
host application validates URCs and AT command responses and reacts adequately, for example by
sending a close message or starting a timer.
A brief description of the internet service commands are provided in Table 9.10. For futher
information, refer to the Siemens TC65/MC75 AT Command Set document available from Siemens.
Table 9.10: Internet Service Commands
Command Description
AT^SICS
Internet Connection Setup Profile:
The command serves to create and edit Internet connection profiles.
AT^SISS
Internet Service Setup Profile:
The command serves to set up the necessary parameters in the Internet service
profiles.
AT^SISO
Internet Service Open:
The write command starts the Internet session configured by the service profile.
AT^SISC
Internet Service Close:
The write command performs all necessary action to release all properties
activated by AT^SISO.
AT^SISR
Internet Service Read Data:
The write command triggers reading data via the Internet service configured
with AT^SISS.
AT^SISW
Internet Service Write Data:
The write command triggers writing data via the Internet service configured
configured with AT^SISS.
At^SISX
Internet Service Execution:
The write command sends ICMP (Internet Control Message Protocol) Echo
Requests to a target IP address or host name (also referred to as Ping
command).
AT^SISX=”Ping”,0,<host name or IP address>
