Siemens AC75 manual Address notation

AC75 AT Command Set s

it on another interface is denied with "+CME ERROR: Invalid index". If queried with the read command AT^SISS? the entire profile is returned on the interface where the service profile was created, while on all other interfaces only the service type of the profile is stated.

-To free a service profile for use on another interface, use the AT^SISS command and select service type = "none". This action deletes the entire profile and restores all parameters of the profile to their initial power-up state (all values are empty). For example, to remove the service profile 3, set AT^SISS=3,srv- Type,none. After this, a new profile 3 can be created on any other interface.

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").

Timeouts

Timeouts are not part of the Internet AT command functionality implemented in AC75 and, if desired, are the responsibility of the host application. It is recommended that the host application validates URCs and AT com- mand responses and reacts adequately, for example by sending a close message or starting a timer.

Socket service used with UDP protocol

The significant differences between the TCP and UDP protocols imply that UDP sometimes requires particular procedures or even specific parameters. Details on how to handle UDP services can be found in extra notes or are included in the general parameter descriptions.

The AC75 offers two kinds of Socket service with UDP protocol. One is referred to as UDP client intended for connections to a given remote host. In this case the IP address and the UDP port of the remote host are set as a fixed parameter in the service profile. The other type is referred to as UDP endpoint where IP address and UDP port of the remote hosts are handled in each read (AT^SISR) and write (AT^SISW) request. This enables the host application to communicate with different remote hosts.

Using the DCD line to detect the connection status of Internet services

With AT&C you can configure the DCD line of the used serial interface to indicate whether an Internet service is active. For Socket, HTTP, SMTP and POP3 the states "Up" or "Connecting" are indicated, for FTP only the state "Up".

AC75_ATC_V01.002	Page 255 of 569	10/30/06
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