Hitachi CP-X253 RS-232C Communication, Protocol, Header, Command data, Connecting the cable

1.

2.

RS-232C Communication

RS-232C Communication

1	2	3	4	5
6	7	8		9

CONTROL port	RS-232C cable (Cross)
of the projector	- (1)	(1)		CD
	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

1 2 3 4 5

6 7 8 9

RS-232C port

of the PC

Connecting the cable

Turn off the projector and the PC.

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

in the previous page.

3. Turn the PC on, and after the PC 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 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.