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74
RS-232C Configurations
7-Wire Configurations
(Standard RS-232C cable)
PC
2
RXD
TXD
3
5
GND
DTR
4
DSR
6
7
RTS
CTS
8
D-Sub 9
3-Wire Configurations
(Not standard)
PC
RXD
2
TXD
3
5
GND
DTR
4
6
DSR
RTS
7
CTS
8
D-Sub 9
Communication Parameters
• Baud rate: 9,600 bps (UART)
• Data length: 8 bits
• Parity : None
• Stop bit: 1 bit
• Communication code: ASCII code
• Use a crossed (reverse) cable.
IR OUT Using Guide
Suitable / Not Recommend remote-controller data format
Suitable data format
TV
3
TXD
Not recommend data format
2
RXD
5
GND
IR Receiver specifications
6
DSR
4
DTR
8
CTS
7
RTS
D-Sub 9
Minimum gap time is required of
Minimum gap time in the data stream
TV
3
TXD
Parameter Symbol
2
RXD
High Level
5
GND
Out Pulse
6
DSR
Width
4
DTR
Low Level
8
CTS
Out Pulse
7
RTS
Width
D-Sub 9
Item
Carrier frequency
Peak Wavelength
Minimum burst length
Data word length
is needed of
Conditions Min Typ Max Unit
Burst Wave
Twh
= 600 µs
Period =
Twl
1.2 ms
• If not use the remote-controller with data formats
recommended, IR output signals will be suppressed
automatically by IR receiver.
• In this case, LG does not guarantee IR working function.
• To make sure of this matter, here are two methods as below.
- Use the remote-controller with suitable data
formats.
- Use the IR dongle receiver of the set-top box.
Formats
NEC, RC5, Toshiba
Continuous data format
(short burst/gap signal)
37.9 KHz
940 nm
Min. 300 us
Min. 350 us
Max. 100 ms
Min. 50 ms
µs
400
-
800
µs
400
-
800
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