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T440 Users manual V021/B, © JED Microprocessors Pty Ltd Nov 17th 2008 Page 9
LG LCD/Plasma display/TV (Code 18, 19, 1A and 1B hex)
In the back of each “Owner’s manual” is a list of “input select” codes … examine this table to determine the family.
There are over a 100 different displays in the “kb” LG family, and codes 18 and 19 cover the “kb” codes group (see the
manuals). There are several allocations used, but all use numbers in the 6 … 9 range for RGB analog computer, so all
these are drivable by the code, some may need manual (i.e. at setup time) allocation to constants 0 … 3. AV1/2 code can
vary too, but usually in the 0 … 5 range. Devices are, LCD TV 32/37/42/47/52 LB9/LC7/LC2, and plasma TV 42/50/60
PB2/4/PC5/PY3. Choice of codes 18 or 19 determines TV type, Analog or Digital.
The newer “xb” family, with codes 1A and 1B, cover the LG3, LG5, LG6 and LG7 family and use a single hex byte
after the ASCII select string, with the top 4 bits (5x, 9x, 2x, 4x) selecting an input type (AV, Component, etc) and the
low 4 bits the input number (x0 or x1). Choice of codes 1A or 1B determines TV type, Analog or Digital.
(Another, older, group uses an “i” as a leading character; these are NOT drivable with the Code 18/19/1A/1B driver.)
Function code “kb” strings,
code 18, 19 hex
“xb” strings,
code 1A, 1B hex
Comments
Computer1 'kb 00 6' + 0D 'xb 00 ' + 50 + 0D Select RGB-PC (sometimes RGB-DTV on older)
Computer2 'kb 00 7' + 0D 'xb 00 ' + 90 + 0D Select HDMI-1 (sometimes RGB-PC on older)
Video1 'kb 00 2' + 0D 'xb 00 ' + 20 + 0D AV1 Video/S-Video
Video2 'kb 00 3' + 0D 'xb 00 ' + 21 + 0D AV2 Video/S-Video (some only)
Video3 'kb 00 4' + 0D 'xb 00 ' + 40 + 0D Component 1 Video YPbPr
Video4 'kb 00 5' + 0D 'xb 00 ' + 41 + 0D Component 2 Video YPbPr
Video5 'kb 00 7' + 0D 'xb 00 ' + 90 + 0D Select HDMI-1 (sometimes RGB-PC on older)
Video6 'kb 00 8' + 0D 'xb 00 ' + 91 + 0D Select HDMI-2 (sometimes HDMI-1 or DVI on older)
Any one of these codes can be set into Constant:0/Constant:1 for computer codes and Constant:2/Constant:3 for video
codes. (The default is to have Computer1 (above) as the “Computer” channel and Video1 as the “Video” channel.
Setting OPT1 switch ON will swap Video1 and Video2 channels.)
TV := 'kb 00 0' + 0D; or := 'xb 00 ' + 00 + 0D; // TV Digital (Code 18 or 1A hex selects)
TV := 'kb 00 1' + 0D; or := 'kb 00 ' + 10 + 0D; // TV Analog (Code 19 or 1B hex selects)
This panel can be used with a number of keyboards:
• With a “Code 9” or “Code B” keyboard, with buttons selecting “Video” and ‘Computer”, with “Volume Up/Dn”;
• With a “Code E” keyboard, with buttons selecting “TV”, “Video” and “Computer”, with TV channel Up/Down
and Volume control keys. (The TV channel commands send incremental (i.e. up and down) commands), so the
limits are set in the panel.)
• No OPT7 handshake mode or power on panel connection blink codes available.
• Freeze command is not available.
RS232 connections to LG LCD, LG Plasma and Zenith flat screens
These use a 9-pin-D9 male on the panel, female on cable. Comms is at 9600, 8N1
Function/Direction T440 “projector”
Connection
Panel RS232 Port
Connector
Ground Ground 9-pin D-sub pin 5
Data from T440 to projector Tx 9-pin D-sub pin 3 (RXD)
Reply data from projector to T440 Rx 9-pin D-sub pin 2 (TXD)
Plus 9 volt CTS/DTR to projector N/C N/C
8
1 2 3 4 5
6 7 9
D-sub 9 female
solder side
After installation wiring of any projector to a T440, use a multimeter to check voltages of –9 on BOTH TX and RX pins
in any installation, as described in the troubleshooting part of this manual.
Some have clamp diodes on signal lines so voltages may be limited to -0.7 volts and plus 5v signal pulses.