Specifications

AT Command Set Reference
Ver. 1.00
GSM1308AT001 Page 154 Ver. 1.00 – 10/29/2008
2.3.1.20. AT+IPR Fixed TE-TA Data Rate
(continued)
Notes When changing the value of AT+IPR, the
new baud rate is effective immediately. In
order to properly save the new setting and
communicate with the modem, the user
must change the baud rate of the
communicating device to the new baud rate
before any more communication with the
modem can be accomplished.
Auto Baud is now supported and is set
by setting AT+IPR=0. This is the factory
default setting. The modem will buffer
unsolicited responses, until the baud rate is
determined by receiving the first “A” or “a”
character over the primary serial port. Auto
baud only supports settings 1200 to
115200.
• To avoid problems caused by an
undetermined or mis-matched bit
rate, it is strongly recommended that
auto- bauding only be used if needed
for initial configuration. Your
application initialization script
should then set your desired fixed bit
rate rather than auto-bauding.
• Do not use AT$AREG=2 with
autobauding of the serial port and
PAD functions. The serial port will
not respond to at commands if the
modem establishes a connect state
before the baud rate has been
determined for the serial port.