Hitachi CP-X870 user manual RS-232C Communication, Protocol, Header, Command data

RS-232C COMMUNICATION

(1)Turn off the projector and computer power supplies, and connect with the RS-232C adapter via the RS-232C cable.

(2)Turn on the computer power supply and after the computer has started up, turn on the projector power supply.

	Projector	Computer		RS-232C jack
Control jack	1	1	CD	D-sub 9-pin
	2	2	RD
D-sub 15-pin shrink jack	3	3	TD	1	2	3 4	5
	4	4	DTR
	5	5	GND	6	7	8	9
	SELO 6	6	DSR
	RTS 7	7	RTS
	8	8	DTS
	9	9	RI
	GND 10
	11
	12
	RD 13
	TD 14
	15
	RS-232C adapter

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.

5