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Chapter 4 – Serial Interface Control Commands Parameter Descriptions: 0 Disables reporting of local port rate 1 Enables reporting of local port rate Port rate setting upon connection setup (bps) 0 Autobauding (see Section 4.9.1, Autobauding). 300 600 1200 2400 4800 9600 14400 19200 28800 38400 57600 115200 230400 460800 4.9 AT+IPR Set Fixed Local Rate Description: Test Command Syntax: AT+IPR= Response: Read Command Syntax: AT+IPR Response: The command AT+IPR can be used to set or query the TE-TA interface bit rate. 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 TE (DTE) and TA (DCE) are configured to the same rate. When you select autobauding, the TA will automatically recognize the bit rate currently used by the TE. 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 TA bit rate will not be saved and, therefore, needs to be resynchronized after restarting the GSM engine (see Section 4.91, Autobauding). +IPR: OK Write Command Syntax: AT+IPR= Response: +IPR: (list of supported auto-detectable s) , (list of supported fixed-only s) OK OK ERROR +CME ERROR Parameter DescriptionsD bit rate per second (bps) 0 Default. Activates autobauding. See Section 4.91, Autobauding for further details. 300 600 1200 2400 4800 9600 14400 19200 28800 38400 57600 115200 230400 460800 Notes: • Factory default is autobauding enabled (AT+IPR=0). It will not be restored with AT&F. Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 54
Chapter 4 – Serial Interface Control Commands • The current setting of AT+IPR will be preserved when you download firmware or in the event of power failure. Note: A firmware update does not restore the factory setting. • 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 Section 1.4.2, Combining AT commands on the same command line. ∗ Take into account, that a delay of 100ms 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. If the ME is operated in Multiplex mode we suggest a minimum bit rate of 4800bps. • A selected bit rate takes effect after the write commands returns OK (except for Multiplex mode). • In Multiplex mode, the write command AT+IPR= will not change the bit rate currently used, but the new bit rate will be stored and becomes active, when the module is restarted. 4.9.1 Autobauding To take advantage of autobaud mode specific attention must be paid to the following requirements: • Synchronization between TE and TA. Ensure that TE and TA are correctly synchronized and the bit rate used by the TE is detected by the TA. 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 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 bits are 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 be sent 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 the autobaud mechanism (e.g., 300 bps). Responses to AT+IPR=0 and any commands on the same line might be corrupted. ∗ When autobauding is switched on: (DAR) ∗ only data length, parity, and baud rate are automatically detected. ∗ if using 1 stop bit, AT+ICF=1 should not be used because AT+ICF=1 uses 2 stop bits. ∗ if using 2 stop bits, no combination of AT_ICF should be used. • Autobauding and bit rate after restart. The most recently detected bit rate is stored when the ME is powered down (with AT^SMSO). Therefore, each time the module is restarted the correct bit rate must be found as described above. 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 account when autobauding and autoanswer mode (ATS0 ≠’ 0) are enabled at the same time, especially if SIM PIN 1 authentication is done automatically and the setting ATS0 ≠’ 0 is stored to the user profile with AT&W. Until the bit rate is found, URCs generated after restart will be output at 57600 bps. This applies only to user defined URCs, such as “+CREG”, “CCWA”, “^SCKS” etc. The URCs “^SYSSTART”, and "^SYSSTART AIRPLANE MODE" will not be indicated when autobauding is enabled. Note: To avoid any problems caused by undetermined bit rates in the direction from TA to TE we strongly recommend to configure a fixed bit rate rather than autobauding. • Autobauding and multiplex mode. If autobauding is active, you cannot switch to multiplex mode. Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 55
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Wireless EDGE Modems MultiModem ®
Page 3 and 4: Table of Contents Table of Contents
Page 5 and 6: Table of Contents 8.8.1 AT^MONI Res
Page 7 and 8: Table of Contents 16.5 AT+CPBW Writ
Page 9 and 10: Chapter 1 - Introduction Chapter 1.
Page 11 and 12: 1.5 Supported Character Sets Chapte
Page 13 and 14: Chapter 1 - Introduction Figure 1.2
Page 15 and 16: Chapter 1 - Introduction 1.5.2.2 Im
Page 17 and 18: Chapter 1 - Introduction For most o
Page 19 and 20: Chapter 2 - Configuration Commands
Page 21 and 22: 2.5 ATV Set Result Code Format Mode
Page 37 and 38: 3.2 AT+CIND Indicator control Descr
Page 39 and 40: Chapter 3 - Status Control Commands
Page 51 and 52: Chapter 4 - Serial Interface Contro
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Page 61 and 62: 5.2 AT+CPIN2 PIN2 Authentication Ch
Page 65 and 66: 5.4 AT+CLCK Facility Lock Chapter 4
Page 71 and 72: Chapter 6 - Identification Commands
Page 73 and 74: Chapter 6 - Identification Commands
Page 75 and 76: 7.2 ATA Answer a Call Chapter 7 - C
Page 77 and 78: Chapter 7 - Call-Related Commands 7
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Chapter 8 - Network Service Command
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Chapter 9 - Supplementary Service C
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9.10 AT+CLIR Calling Line Identific
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Chapter 10 - Internet Service Comma
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Write Command Syntax: Response: AT^
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11.3 AT+CGATT GPRS Attach or Detach
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Chapter 11 - GPRS Commands 11.5 AT+
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Chapter 11 - GPRS Commands 11.7 AT+
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Chapter 11 - GPRS Commands This pa
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Chapter 11 - GPRS Commands This pa
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11.10 AT+CGQMIN Quality of Service
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Chapter 11 - GPRS Commands 11.11 AT
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Chapter 11 - GPRS Commands AT+CGDAT
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Chapter 12 - FAX Commands 12.3 AT+F
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Chapter 13 - Short Message Service
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Chapter 14 - SIM-Related Commands C
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Chapter 14 - SIM-Related Commands 1
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Chapter 14 - SIM-Related Commands 1
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Chapter 15 - SIM Application Toolki
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Chapter 17 - Audio Commands Chapter
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Chapter 17 - Audio Commands Please
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Chapter 17 - Audio Commands 16.5 AT
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Chapter 17 - Audio Commands 16.10 A
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Chapter 18 - Hardware-Related Comma
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Chapter 19 - Miscellaneous Commands
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Chapter 20 - Summary Tables 20.2 St
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Chapter 20 - Summary Tables 20.3 AT
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Chapter 20 - Summary Tables Interne
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Chapter 20 - Summary Tables 20.4 Av
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Chapter 20 - Summary Tables 20.5 AT
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Chapter 20 - Summary Tables SIM-Rel
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Chapter 20 - Summary Tables ^SSTN ^
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Chapter 20 - Summary Tables Command
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Chapter 20 - Summary Tables Command
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