Epson JED T440 MP722, MP723, MP771, SP870 Code 3D hex, BenQ projectors RS232 Connection, Function

BenQ MP510, MP610, MP611, MP620, MP720P, MP721 (Code 38 hex), BenQ MP622 (Code 39 hex), BenQ MP770 (Code 3A hex)

Channel codes for all except MP770 are:

Computer1	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 00 + 60;	// Analog RGB DB15
Computer2	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 01 + 61;	// DVI (Analog RGB) (some only)
Video1	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 04 + 64;	// Composite Video RCA
Video2	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 05 + 65;	// S-Video
Video3	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 03 + 63;	// Component YPbPr via DB15
Channel codes for MP770 are:
Computer1	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 00 + 60;	// Analog RGB DB15
Computer2	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 02 + 62;	// DVI (Analog RGB)
Video1	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 05 + 65;	// Composite Video (RCA)
Video2	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 06 + 66;	// S-Video
Video3	:= 06 + 14 + 00 + 04 + 00 + 34 + 13 + 01 + 01 + 61;	// Component YPbPr via DB15

MP722, MP723, MP771, SP870 (Code 3D hex)

Channel codes for these are:
Computer1	:= 0D + '*sour=rgb#' + 0D;		// Analog RGB DB15
Computer2	:= 0D	+ '*sour=dvia#' + 0D;	// DVI-A (Analog) some only
Video1	:= 0D	+ '*sour=vid#' + 0D;	// Composite Video RCA
Video2	:= 0D	+ '*sour=svid#' + 0D;	// S-Video
Video3	:= 0D	+ '*sour=dvid#' + 0D;	// DVI-D (Digital)

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.)

•OPT7 handshake mode and power on panel connection blink codes available (not MP722/MP723/MP771/SP870);

•Source scan must be turned off using normal on-screen menu options;

•RS232 communications must be enabled and baud rate set to 19200 in the secret factory setup menu. We have been requested by BenQ not to include these instructions in a general manual like this: Please contact JED at: jed@jedmicro.com.au for details.

•Freeze and mute are toggle mode only in these projectors, so 2-yellow-button mute mode is NOT supported (is in MP722/MP723/MP771/SP870 as this has mute state read-back. Set T461 audio and OPT7 to use this);

•Audio functions are limited to one audio input and no output. Use a T461 if audio control is needed.

BenQ projectors: RS232 Connection

(Communications runs at 19200 8N1. Projectors use a male 8-pin mini-DIN on the cable

Function	T440 “projector”
	Connection
Ground	Pin 1
Serial TX out to projector	Pin 2
Serial RX into T440 from proj.	Pin 3
CTS out to projector	Pin 4

DIN 8-pin BenQ,

Pin 4

Pin 1

Pin 7

Not used

1 2

3 4 5

6 7 8

Mini-DIN 8 solder side

Even though some BenQ manuals show a D sub 9 connector, the tested projectors all have mini-DIN 8-pin sockets. 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.

Note: MP722/MP723/MP771/SP870: These projectors have a nasty hang-up habit, where coms just stops and only recovery is a 240v power cycle (i.e. at the power point or by pulling the power plug. Until BenQ fix this, DO NOT INSTALL IT POWERED FROM A CEILING POWER POINT. Instruct the user on how to “power cycle” the projector if it stops communicating.

T440 Users manual V021/B, © JED Microprocessors Pty Ltd Nov 17th 2008 Page 2