Dukane 8755E-RJ, 8776-RJ user manual RS-3C Communication, Connecting the cable, Protocol, Header

RS-232C Communication (continued)

RS-3C Communication

1  3 4 5

6 7 8 9

CONTROL port of the projector

1		3	4 5
6	7	8	9

RS-3C cable (Cross)				RS-3C port
- (1)	(1)		CD	of the computer
RD ()		() 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-3C port of the computer by a RS-3C cable (cross). Use the cable that fulfills the

specification shown in the previous page.

3. Turn the computer on, and after the computer has started up turn the projector on.

Communications setting 1900bps, 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_			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.
	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.