Hitachi CP-X444, CP-X440 RS-232C Communication, Connecting the cable, Communications setting

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RS-232C Communication

RS-232C Communication

1	2	3	4	5	1	2	3	4	5
6	7	8		9	6	7	8		9

CONTROL port	RS-232C cable (Cross)			RS-232C port
of the projector	- (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

Turn off the projector and the computer.

Connect the CONTROL port of the projector with a RS-232C port of the computer by a RS-232C cable (cross). Use the cable that fulfills the

specifi cation shown in the previous page.

3. Turn the computer on, and after the computer has started up turn the 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 fl ag for command data

CRC_high : Upper byte of CRC fl ag 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	Classifi cation				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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