Technical information

Chapter 2: AT+i Commands Reference
May 31, 2008 AT+i Commands Reference Manual 2-7
+iTUP - Triggered Internet Session Initiation
Notes:
• When going online in one of these modes, W24 activates its web server if the AWS
parameter is set (AWS>0).
• In this mode, W24 does not go offline after a completion of any successful or unsuc-
cessful Internet session started by the host, even if the stay online flag is not used.
• When a Carrier Lost event is detected, W24 automatically retries to establish a connec-
tion (without performing a software reset), with the following exception: If, at the time
of the detection, the host was waiting for a reply from W24 or was in the process of
sending binary data (SSND, FSND, EMB), W24 reports error code 094 as soon as it
can and only then tries to re-establish the connection. In all other cases, W24 gives the
host no indication of losing the carrier. In the event of Carrier Lost, W24 closes any
Syntax: AT+iTUP:<n>
Enter triggered Internet session initiation mode.
This command is relevant in a modem environment only.
Parameters: n=0..2
Command Options:
n=0 Disable triggered Internet session initiation mode.
n=1 Enter triggered Internet session initiation mode. Upon receiving a hardware
signal trigger (Modem RING or MDSEL signal pulled low), establish a PPP
Internet connection and carry out the IP registration process according to the
relevant registration option parameters.
If any characters are received on the host port prior to receiving a hardware
signal, W24 exits this mode and functions normally. In this case, to reinstate
this mode, issue AT+iTUP=1 again; reset W24 by issuing the AT+iDOWN
command, or recycle power.
n=2 Always Online mode. Whenever W24 is offline, it automatically attempts to
establish a PPP Internet connection and possibly carry out the IP registration
process according to the relevant registration option parameters.
W24 disregards this mode and remains offline until the next SW or HW
reset if:
• The MSEL (Mode Select) signal was pulled low (logical 0) for more than
5 seconds during runtime.
-or-
• The host issues the (+++) escape sequence.
Power must be recycled or the AT+iDOWN command issued for this
command to take effect.
If W24 is in Auto Baud Rate mode (BDRF=a) and/or Auto Host mode
(HIF=0), W24 waits for the a character on the host serial port to resolve the
baud rate after rebooting and before activating the iRouter and going online,
or before activating the DHCP server. Therefore, it is recommended to set a
fixed host interface and a fixed baud rate in this case.
Result Code:
I/OK If n is within limits.
I/ERROR Otherwise.