DIRECTV R15 Installation Guide - Page 31

DIRECTV Set-Top Box Information for the Installer Return Data Stream Return Response Return Value Description TunerID : 0x01 - 0xFF [Signal Quality Signal Quality: 0x00 - 0x64 ( 0x00=FEC unlocked and 0x64=max signal strength) ACK_FCNOK : Success NACK_FCNOK : Failure - STB not tuned to a DIRECTV System channel 0x0000 : Success Non-Zero : Failure - STB not tuned to a DIRECTV System channel The STB will execute a GetSignalQualityMT command by providing the signal quality in the Return Data Stream. 5.19 OpenUserChannelMT (0x9F) Command Label Command Byte Input Parameter(s) OpenUserChannelMT 0x9F [MajorChnHI] [MajorChnLO] [MinorChnHI] [MinorChnLO] [TunerID Return Data Stream Return Response Return Value MajorChnHI : 0x00 - 0xFF MajorChnLO : 0x00 - 0xFF MinorChnHI : 0x00 - 0xFF MinorChnLO : 0x00 - 0xFF TunerID: 0x01 - 0xFF None ACK_FCNOK : Success NACK_FCNOK : Failure - Not a DIRECTV System channel 0x0000 : Success 0xFFFF : Channel not found in Program Guide 0xFFFE : Channel is not a DIRECTV System channel 0x0002 : No Video Control Word 0x0004 : No Audio Control Word 0x0008 : No HS Data Control Word 0x0010 : No Low-Speed Data Control Word 0x0020 : No System Clock Reference 0x0040 : No Presentation Time Stamp 0x0080 : Tuning Error DIRECTV, Inc. Version 2.2 Page 31 of 42 March 5, 2008 DTV-MD-0058