C55/C55i AT COMMAND SET Description Preliminary - Falcom

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C55/C55I AT COMMAND SET VERSION 1.00 3.7 AT+IPR Set fixed local rate The command AT+IPR can be used to set or query the DTE-DCE interface bit rate. Syntax Test Command AT+IPR=? Read Command AT+IPR? Write Command AT+IPR= Response(s) + IPR: (list of supported auto-detectable s) , (list of supported fixed-only s) OK Response(s) +IPR: OK Response(s) OK ERROR +CME ERROR Reference(s) PIN ASC0 V.25ter ○ ● Command Description The test command returns the values of the supported automatically detectable bit rates and the values of the supported fixed bit rates. The read command returns the current bit rate of the interface. The write command specifies the bit rate to be used for the interface. When you set a fixed-rate, make sure that both DTE (TE) and DCE (TA) are configured to the same rate. When you select autobauding, the DCE will automatically recognize the bit rate currently used by the DTE. The setting is stored in the non-volatile memory and will be used whenever the engine is powered up again. However, in case of autobaud mode (AT+IPR=0) the detected DCE bit rate will not be saved and, therefore, needs to be resynchronized after restarting the GSM engine (see chapter 3.7.1). Parameter Description (num)(&V) bit rate per second (bps) 0 (D) Activate autobauding (see chapter 3.7.1). 300 600 1200 2400 4800 9600 14400 19200 28800 38400 57600 This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 70
C55/C55I AT COMMAND SET VERSION 1.00 115200 230400 Notes • The factory default is autobauding enabled (AT+IPR=0) on ASC0. 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 does not restore the factory setting) 3.7.1 Autobauding or in the event of power failure. • Generally, AT+IPR should be used as a standalone command. If nethertheless 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 chapter 0.4.2. - Take into account, that a delay of 100 ms is required between the response to the last command (e.g. OK) and the next command on the same line. - When you enter AT+IPR=0, autobauding will be activated after the response to the last command is received. - When local echo is active (ATE1) and you enter AT+IPR=X with other commands you may encounter the following 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. • In order to account for greater amounts of data it is recommended to choose a minimum bit rate of 2400 bps. • A selected bit rate takes effect after the write commands returns OK. To take advantage of autobaud mode specific attention must be paid to the following requirements: • Synchronization between DTE and DCE Ensure that DTE and DCE are correctly synchronized and the bit rate used by the DTE is detected by the DCE (ME). To allow 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 seconds before 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 DTE-DCE synchronization, when you activate autobauding first and then configure the autoanswer mode (ATSO * 0). • Restrictions on autobauding operation This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 71
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C55/C55i AT COMMAND SET Description Preliminary - Falcom

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