Data5: | 7 | Main/Sub | 6 | Two/One | 5 | Using Physical | 4 | 3 | 2 | 1 | 0 | Step |
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| 0 | Main | 0 | Two | 0 | Use | x | 0 | 0 | 0 | 0 | NTSC Air |
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| 1 | Sub | 1 | One | 1 | No Use | x | 0 | 0 | 0 | 1 | NTSC Cable |
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| x | 0 | 0 | 1 | 0 | ATSC Air |
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| x | 0 | 0 | 1 | 1 | ATSC Cable_std |
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| x | 0 | 1 | 0 | 0 | ATSC Cable_hrc |
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| x | 0 | 1 | 0 | 1 | ATSC Cable_irc |
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| x | 0 | 1 | 1 | 0 | ATSC cable_auto |
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| x | 0 | 1 | 1 | 1 | Reserved |
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| x | x | x | x | x | ... |
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| x | 1 | 1 | 1 | 1 | Reserved |
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The table above lists the binary code which must be converted to Hexadecimal before sending. For example: The binary code to tune the sub source to an NTSC cable channel is “1000 0001”, which translates to “81” in Hex.
*7th bit: For which source do you want to change the channel.
*6th bit: Use a two part or one part channel. Most cases just use 0 since it’s ignored when using NTSC.
*5th bit: Use 0 with NTSC since it can only use the phys- ical channel number. Normally use 1 for ATSC since most times it doesn’t matter what the physical number is.
*4th bit: Set to 0.
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*Tune Command Examples:
1.Tune to the analog (NTSC) cable channel 35. Data 00 = Physical of 35 = 23
Data 01 & 02 = No Major = 00 00 Data 03 & 04 = No Minor = 00 00 Data 05 = 0000 0001 in binary = 01 Total = ma 00 23 00 00 00 00 01
2.Tune to the digital (ATSC) local channel
Data 01 & 02 = Major is 30 = 00 1E Data 03 & 04 = Minor is 3 = 00 03 Data 05 = 0010 0010 in binary = 22 Total = ma 00 00 00 1E 00 03 22
Acknowledgement[a][ ][Set ID][ ][OK][Data00][Data01] [Data02][Data03][Data04][x][a][ ][Set ID]
[ ][NG][Data00][x]
APPENDIX
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