LG Electronics 4770 Step, Transmission mb Set ID DataCr, Acknowledgement b Set ID OK/NGDatax

Data05:	7	Main/Sub	6	Two/One	5	Using Physical	4	3	2	1	0	Step
				Part Channel
		Picture				Channel	Reserved
	0	Main	0	Two	0	Use	x	0	0	0	0	NTSC Air
	1	Sub	1	One	1	No Use	x	0	0	0	1	NTSC Cable
							x	0	0	1	0	ATSC Air
							x	0	0	1	1	ATSC Cable_std
							x	0	1	0	0	ATSC Cable_hrc
							x	0	1	0	1	ATSC Cable_irc
							x	0	1	1	0	ATSC cable_auto
							x	0	1	1	1	Reserved
							x	x	x	x	x	...
							x	1	1	1	1	Reserved

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.

* 3-0 bits: Choose signal type.

22. Channel Add/Del (Command: m b) To add and delete the channels

Transmission [m][b][ ][Set ID][ ][Data][Cr]

Data 00: Channel Delete Data 01: Channel Add

Acknowledgement [b][ ][Set ID][ ][OK/NG][Data][x]

23. Key (Command: m c)

To send IR remote key code.

Transmission [m][c][ ][Set ID][ ][Data][Cr]

Data Key code: Refer to page 128.

Acknowledgement [c][ ][Set ID][ ][OK/NG][Data][x]

24. Backlight (Command: m g) (Only LCD TV model)

To adjust screen backlight.

*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 30-3. Data 00 = Don’t know Physical = 00

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]

Transmission [m][g][ ][Set ID][ ][Data][Cr]

Data Min:00 ~ Max:64 (*transmit by Hexadecimal code) *Refer to ‘Real data mapping 1’. See page 133.

Acknowledgement [g][ ][Set ID][ ][OK/NG][Data][x]

APPENDIX

135