RS232 connections to Sherwood TV/LCD panel

NEC NLT-40/46FHD100, Sherwood LF-401-TB5 TV/LCD panel (Codes 1C and 1D), (Made by “indtek” in Korea as LC-401EB3 and LC-461EB3, also sold by Grundig.)

There are two drivers for this: these are same for Computer and Video, but the TV function can select Full HD Digital tuner (Code 1C hex) or analog tuner (Code 1D hex)

This family has many members with a range of channel messages.

Channel codes are:
Computer1	:= 'kb 00 7' + 0D		// Select PC-RGB
Computer2	:= 'kb 00 8' + 0D		// Select HDMI-1
Computer3	:= 'kb 00 9' + 0D		// Select HDMI-2
Computer4	:= 'kb 00 A' + 0D		// Select HDMI-3
Video1	:= 'kb 00 2' + 0D;		// AV1 Comp Video
Video2	:= 'kb 00 5' + 0D;		// S-Vid
Video3	:= 'kb 00 3' + 0D;		// AV2 Comp Video
Video4	:= 'kb 00 4' + 0D;		// AV3 Comp Video (side)
Video5	:= 'kb 00 6' + 0D;		// Component
Video6	:= 'kb 00 0' + 0D;		// TV Digital
Video7	:= 'kb 00	1' + 0D;	// TV Analog
Video8	:= 'kb 00	8' + 0D;	// Select HDMI-1
Video9	:= 'kb 00	9' + 0D;	// Select HDMI-2
Video10	:= 'kb 00	A' + 0D;	// Select HDMI-3

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, making S-Video the video default.)

TV	:= 'kb 00 0' + 0D;	// TV Digital (Code 1C hex selects)
TV	:= 'kb 00 1' + 0D;	// TV Analog (Code 1D hex selects)

This panel can be used with a number of keyboards:

•With a “Code 9” or “Code A” keyboard, with buttons selecting “Video” and ‘Computer”, with either “Volume” (code 9) or “Freeze/Mute” (Code A);

•With a “Code B-L” or “Code B-P” keyboard, with buttons selecting “Video” and “Computer1” and “Computer2” with Volume control keys; or

•With a “Code E” keyboard, with buttons selecting “TV”, “Video” and “Computer”, with TV channel Up/Down and Volume control keys. (The channel commands send incremental (i.e. up and down) commands), so the limits are set in the panel.)

(Keyboards B and E combine channel keys with “On” keys.)

•Panel connection blink codes are available but OPT7 handshake mode in NOT.

These use a RG45 on the LCD, female on cable. Comms is at 9600 baud, 8 bits, no parity, 1 stop.

Function/Direction	T440 “projector”	RG45 Connector EIA568A
	Connection

Ground	Ground	Pin 3 (orange-white) &
		pin 4 (solid blue)

Data from T440 to projector	Tx	Pin 1, green-white

Reply data from projector to T440	Rx	Pin 2, solid green

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.

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