BGS2T AT Command Set
4.7 AT+IPR
BGS2T_ATC_V01.301
Page 102 of 554
1/31/12
c
2400
4800
9600
14400
19200
28800
38400
57600
115200
230400
Note
•
Generally,
should be used as a standalone command as specified in Section
. If nevertheless combinations with other commands on the same command line cannot be
avoided, there are several constraints to be considered:
-
Avoid combinations with the AT commands listed in Section
-
Keep in mind that there shall be a minimum pause between two AT commands as specified in Section
Communication between Customer Application and BGS2T
.
-
If
=0 is entered, Autobaud mode will be activated after the response to the last command is
received.
-
If local echo is active (
1) and
=x is entered with other commands you may encounter the fol-
lowing problem: If switching to the new bit rate takes effect while a response is being transmitted, the last
bytes may be sent with the new bit rate and thus, not properly transmitted. The following commands will
be correctly sent at the new bit rate.
4.7.1
Autobauding
To take advantage of Autobaud mode specific attention must be paid to the following requirements:
•
Synchronization between TE and ME:
Ensure that TE and ME are correctly synchronized and the bit rate used by the TE is detected by the ME. To
allow the bit rate to be synchronized simply use an "AT" or "at" string. This is necessary
-
after you have activated Autobaud mode
-
when you start up the ME while Autobaud mode is enabled. It is recommended to wait 3 to 5 seconds
before sending the first AT character. Otherwise undefined characters might be returned.
If you want to use Autobaud mode and auto-answer at the same time, you can easily enable the TE-ME syn-
chronization, when you activate Autobaud mode first and then configure the auto-answer mode (
0).
•
Restrictions on Autobaud mode operation:
-
The serial interface shall be used with 8 data bits, no parity and 1 stop bit (factory setting), e.g. 2 stop bits
are not supported for Autobaud mode.
-
cannot be used.
-
Only the strings "AT" or "at" can be detected (neither "At" nor "aT").
-
URCs that may be issued before the ME detects a new bit rate (by receiving the first AT character) will be
sent at the previously detected bit rate or, after ME restart, at 57600 bps.
-
It is not recommended to switch to Autobaud mode from a bit rate that cannot be detected by the Autobaud
mode mechanism (e.g. 300 bps). Responses to
=0 and any commands on the same line might be
corrupted.
•
Autobaud mode and bit rate after restart:
Unless the bit rate is determined, the following constraints apply:
-
An incoming CSD call or a network initiated GPRS request cannot be accepted. This must be taken into
Confidential / Released