Christie Digital Systems LWU420 user manual RS-232C Communication, Protocol, Header, Command data

RS-232C Communication

RS-232C Communication

1 2 3 4 5

6 7 8 9

CONTROL port of the projector

1	2	3	4	5
6	7	8		9

RS-232C cable (Cross)				RS-232C port
- (1)	(1)		CD	of the computer
RD (2)	(2)		RD
TD (3)	(3) TD
- (4)	(4)		DTR
GND (5)		(5) GND
- (6)	(6)		DSR
RTS (7)	(7)		RTS
CTS (8)	(8)		DTS
- (9)	(9)		RI

Connecting the cable

1. Turn off the projector and the computer.

Connect the CONTROL port of the projector with a RS-232C port of

2. the computer by a RS-232C cable (cross). Use the cable that fulfills the specification shown in the previous page.

Turn the computer on, and after the computer has started up turn the

3. projector on.

Communications setting

19200bps, 8N1

1. Protocol

Consist of header (7 bytes) + command data (6 bytes).

2. Header

BE + EF + 03 + 06 + 00 + CRC_low + CRC_high

CRC_low : Lower byte of CRC flag for command data

CRC_high : Upper byte of CRC flag for command data

3.Command data

Command data chart

byte_0	byte_1	byte_2			byte_3		byte_4	byte_5
Action				Type			Setting code
low	high		low		high		low		high
Action (byte_0 - 1)
Action	Classification					Content
1	SET			Change setting to desired value.
2	GET			Read projector internal setup value.
4	INCREMENT			Increment setup value by 1.
5	DECREMENT			Decrement setup value by 1.
6	EXECUTE			Run a command.

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LWU420 User Manual-Technical Guide020-000320-01 Rev. 1 (06-2010)