MC35i AT Command Set

MC35i AT Command Set4.7 AT+IPR19200288003840057600115200230400 (Not available if product is MC35i Terminal)Notes• Delivery value for is autobauding enabled (AT+IPR=0). It will not be restored with AT&F.• The current setting of AT+IPR will be preserved when you download firmware (i.e. a firmware update doesnot restore the factory setting) or in the event of power failure.• Generally, AT+IPR should be used as a standalone command. If nethertheless combinations with other commandson the same command line cannot be avoided, there are several constraints to be considered:- Avoid combinations with the AT commands listed in Section 1.4.2, Combining AT commands on the samecommand line.- Take into account, that a pause of 100ms is required between the response to the last command (e.g. OK)and the next command.- When you enter AT+IPR=0, autobauding will be activated after the response to the last command isreceived.- When local echo is active (ATE1) and you enter AT+IPR=x with other commands you may encounter thefollowing problem: if switching to the new bit rate takes effect while a response is being transmitted, thelast bytes may be sent with the new bit rate and thus, not properly transmitted. The following commandswill be correctly sent at the new bit rate.• In order to account for greater amounts of data it is recommended to choose a minimum bit rate of 2400 bps.If the ME shall be operated in Multiplex mode we suggest a minimum bit rate of 4800bps.• In Multiplex mode, the write command AT+IPR= will not change the bit rate currently used, but thenew bit rate will be stored and becomes active, when the module is restarted.• A selected bit rate takes effect after the write commands returns OK.4.7.1 AutobaudingTo take advantage of autobaud mode specific attention must be paid to the following requirements:• Synchronization between TE and TAEnsure that TE and TA are correctly synchronized and the bit rate used by the TE is detected by the TA. Toallow the bit rate to be synchronized simply use an "AT" or "at" string. This is necessary- after you have activated autobauding- when you start up the GSM engine while autobauding is enabled. It is recommended to wait 3 to 5 secondsbefore sending the first AT character. Otherwise undefined characters might be returned.If you want to use autobauding and autoanswer at the same time, you can easily enable the TE-TA synchronization,when you activate autobauding first and then configure the autoanswer mode (ATS0 ≠ 0).• Restrictions on autobauding operation- The serial interface shall be used with 8 data bits, no parity and 1 stop bit (factory setting), e.g. 2 stop bitsare not supported for autobaud mode.- The command A/ 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 besent at the previously detected bit rate or, after ME restart, at 57600 bps.- It is not recommended to switch to autobauding from a bit rate that cannot be detected by the autobaudmechanism (e.g. 300 bps). Responses to AT+IPR=0 and any commands on the same line might be corrupted.MC35i_ATC_V02.00nConfidential / ReleasedPage 84 of 3909/10/08