C55/C55i AT COMMAND SET Description Preliminary - Falcom

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C55/C55I AT COMMAND SET VERSION 1.00 Maximum text length: 280 characters Example: "00410042" → 0x00,0x41,0x00,0x21 Problems: • "41" → Error (there are two bytes needed) • "0000" → Error (not an UCS2 character) • "007B" → 0x00,0x7B 0.6 Unsolicited Result Code Presentation URC stands for Unsolicited Result Code and is a report message issued by the ME without being requested by the TE, i.e. a URC is issued automatically when a certain event occurs. Hence, a URC is not issued as part of the response related to an executed AT command. Typical events leading to URCs are incoming calls ("RING"), received SMS etc. A summary of all URCs is given in chapter 17.6. To announce a pending URC transmission the ME will do the following: • Activates its Ring line (logic "1") for one second, i.e. the line changes to physical "Low" level. This allows the TE to enter power saving mode until ME related events request service. • If the AT command interface is busy a "BREAK" will be sent immediately but the URC will not be issued until the line is free. This may happen if the URC is pending - while an AT command is being processed, i.e. during the time from sending the first character "A" of an AT command by the TE until the ME has responded with "OK" or "ERROR", or - during a data call. Please note that AT command settings may be necessary to enable in-band signaling, e.g. refer to AT+CMER or AT+CNMI. For most of these messages, the ME needs to be configured whether or not to send an URC. Depending on the AT command, the URC presentation mode can be saved to the user defined profile (see AT&W), or needs to be activated every time you reboot the ME. Several URCs are not user definable, such as " ^ SYSSTART", " ^ SYSSTART ", "^SHUTDOWN" and the fax class 2 URCs listed in chapter 17.6. If autobauding is enabled (as factory default mode or set with AT + IPR = 0), URCS generated after restart will be output with 57600 bps until the ME has detected the current bit rate. The URCs " ^ SYSSTART", " ^ SYSSTART ", however, are not presented at all. For details please refer to chapter 3.7.1. To avoid problems we recommend to configure a fixed bit rate rather than using autobauding. 0.6.1 Communication between Customer Application and C55 Leaving hardware flow control unconsidered the Customer Application (TE) is coupled with the C55 (ME) via a receive and a transmit line. Since both lines are driven by independent devices collisions may (and will) happen, i.e. while the TE issues an AT command the C55 starts sending an This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 18
C55/C55I AT COMMAND SET VERSION 1.00 URC. This probably will lead to the TE's misinterpretation of the URC being part of the AT command's response. To avoid this conflict the following measures must be taken: • If an AT command is finished (with "OK" or "ERROR") the TE shall always wait at least 100 milliseconds before sending the next one. This gives the C55 the opportunity to transmit pending URCs and get necessary service. Note that some AT commands may require more delay after "OK" or "ERROR" response, refer to the following command specifications for details. • The TE shall communicate with the C55 using activated echo (ATE1), i.e. the C55 echoes characters received from the TE. Hence, when the TE receives the echo of the first character "A" of the AT command just sent by itself it has control over both the receive and the transmit paths. This way no URC can be issued by the C55 in between. 0.7 Common PCN Handset Specification (CPHS) The ME provides features to implement a device following the prerequisites of the Common PCN Handset Specification (CPHS) Phase 2. CPHS Feature Description/Remarks AT command Alternate Line Service Using two phone numbers with one SIM card. AT^SALS Voice Message Waiting Indicate the receipt of a short AT^SIND Indication message coded as Voice Message AT+CMER,indicators Waiting Indicator as defined bythe “vmwait1” and CPHS Phase 2 standard “vmwait2” Operator (Service Read specific Elementary Files AT+CRSM provider) name from SIM (6F14h,6F18h) from SIM Network and Service Provider Lock Lock/Unlock an ME to specific HPLMN and service provider Call Forwarding Get and set diverted call status. Access specific Elementary File (6F13h) from SIM. Customer Service Profile (CSP) Setting services and their menu entries depending on customer profiles. Information numbers Hierarchically structured service numbers phone book on SIM according to CPHS 4.2 (mandatory). AT+CLCK,(AT+CPIN) AT+CCFC, AT+CRSM AT+CRSM AT+CRSM This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 19
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C55/C55i AT COMMAND SET Description Preliminary - Falcom

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