LG 42PA4500 Manual Del Usuario página 43

Transmission / Receiving protocol
Transmission
[Command1][Command2][ ][Set ID][ ][Data][Cr]
[Command 1] : First command to control the set.(j, k, m or x)
[Command 2] : Second command to control the set.
[Set ID] : You can adjust the set ID to choose desired set ID number in Option menu. Adjustment range is
1~ 99. When selecting Set ID '0', every connected the set is controlled. Set ID is indicated as decimal (1~
99) on menu and as Hexa decimal (0x0~ 0x63) on transmission /receiving protocol.
[DATA] : To transmit the command data.
Transmit the 'FF' data to read status of command.
[Cr] : Carriage Return
ASCII code '0x0D'
[ ] : ASCII code 'space (0x20)'
* In this model, set will not send the status during the standby mode.
OK Acknowledgement
[Command2][ ][Set ID][ ][OK][Data][x]
The set transmits ACK (acknowledgement) based on this format when receiving normal data. At this time,
if the data is data read mode, it indicates present status data. If the data is data write mode, it returns the
data of the PC computer.
* In this model, set will not send the status during the standby mode.
* Data Format
[Command 2] : Use as command.
[Set ID] : Use the small character, if set ID is 10, it will send the '0', 'a'.
[DATA] : Use the small character, if data is 0 x ab, it will send the 'a', 'b'.
[OK] : Use the large character.
Error Acknowledgement
[Command2][ ][Set ID][ ][NG][Data][x]
The set transmits ACK (acknowledgement) based on this format when receiving abnormal data from non-
viable functions or communication errors.
Data1: Illegal Code
Data2: Not supported function
Data3: Wait more time
* In this model, set will not send the status during the standby mode.
* Data Format
[Command 2] : Use as command.
[Set ID] : Use the small character, if set ID is 10, it will send the '0', 'a'.
[DATA] : Use the small character, if data is 0 x ab, it will send the 'a', 'b'.
[NG] : Use the large character
EXTERNAL CONTROL DEVICE SETUP
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