Hitachi HOME-1 RS-232C Communication, Connecting The Cable, Communications Setting, Computer

RS-232C Communication

Connecting The Cable

(1)Turn off the projector and the computer power supplies.

(2)Connect the CONTROL port of the projector with a RS-232C port of the computer by a RS- 232C cable. Use the cable that fulfills the specification shown in the following figure.

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

Projector								RS-232C cross cable							Computer
CONTROL								1	1	CD					RS-232C port
	port							RD 2	2	RD
								TD 3	3	TD
								4	4	DTR
9	8	7	6	6	7	8	9	GND 5	5	GND	4	3	2	1	1	2	3	4	5
								6	6	5
5 4	3	2	1 ⇔	1	2 3	4	5			DSR	9	8	7	6	⇔ 6		7	8	9
								RTS 7	7	RTS
								CTS 8	8	DTS

D-sub 9-pin D-sub 9-pin 9 9 RI

plugjack

D-sub 9-pin	D-sub 9-pin
jack	plug

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.

4