ISU AT Command Reference

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ISU AT Command ReferencePhase IV AT Commands: string type sub-address, not supported by Iridium: type of sub-address, not supported by Iridium: is a sum of integers each representing a class of information:1 voice (telephony)2 data: 1..30 when ‘no reply’ is enabled or queried, this gives the time in seconds to wait before call isforwarded. The value of this parameter is controlled by the Iridium system. No need tospecify it. :0 not active1 activeif =2 and command is successful, the ISU returns the following response:+CCFC:,[,,]Test Command: +CCFC=?List of supported s. The response is in the form of:+CCFC:(000-005)8.3 +CLCC - Request Current Call StatusExec Command: +CLCCReturns the current call status of the ISU. The response is of the form:+CLCC: where (State of the ISU):000 Active001 Call Held002 Dialing (MO Call)004 Incoming (MT Call)005 Waiting (MT Call)006 Idle8.4 +CNUM - Read MSISDN NumbersExec Command: +CNUMGet the MSISDN numbers of the SIM. If returning fails, ERROR is returned. Response is in the form:+CNUM:,,: alpha tag of the phone numbers.: MSISDN numbers.: if the number starts with a ‘+’, then the type is 145; otherwise the type is 129.Note: MSISDN numbers are only available if they were intentionally stored on the SIM.Version 2.6March 30, 2006 58
ISU AT Command ReferencePhase IV AT Commands8.5 +WIRLP - Iridium Radio Link ProtocolSet Command: +WIRLP=[[,[,[,< t1>[,[,[,[,[,[,]]]]]]]]]]Set IRLP parameters. specifies the desired IRLP version and can take the following values:0 Default IRLP version (N0) represents the maximum number of sequentially numbered I frames that may be outstandingat any given time at downlink direction (IWF->ISU) and can take the following values:1-105. Default is 105. represents the maximum number of sequentially numbered I frames that may be outstandingat any given time at uplink direction (ISU->IWF) and can take the following values:1-105. Default is 105. is used to supervise the acknowledgment of transmitted unnumbered frames. The values aredefined to be the earliest instant to enter the recovery procedure and can take on thefollowing values: 27-255 (in 50-ms unit). Default is 30. is used to represent the maximum number of re-transmission attempts of a frame (e.g.I,S,N,U frame) and can take on the following values: 1-255. Default is 15. is used to indicate the amount of time available within the acknowledging frame must betransmitted and can take on the following values: 1-255 (in 10-ms unit). Default is 10. is used to represent the maximum number of S frames that are used to acknowledge I framesat downlink direction (IWF->ISU) and can take on the following values: 1-10. Default is 10. is used to represent the maximum number of S frames that are used to acknowledge I framesat uplink direction (ISU->IWF) and can take on the following values: 1-10. Default is 10. is used to supervise the re-sequencing of miss-ordered frames. The values are defined to bethe earliest instant to consider a tardy frame as lost. It can take on the following values:20-255 (in 10-ms unit). Default is 25. is used to indicate the mode of operation and can take on the following values:0 unacknowledged mode of operation1 acknowledged mode of operation (default)NOTE: For the proper operation of the IRLP procedures, T2 should be less than T1 and 2*T4should be less than T1.Version 2.6March 30, 2006 59
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ISU AT Command Reference

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