TECHNICAL (continued)

RS-232C communication

(1)Turn off the projector and computer power supplies and connect with 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

15

14

13

12

11

4

4

DTR

 

 

 

 

8

8

CTS

6

7

8

9

 

10

9

8

76

5

5

GND

 

SELO 6

6

DSR

 

 

 

 

 

 

 

 

 

RTS 7

7

RTS

 

 

 

 

 

 

 

 

 

9

9

RI

 

 

 

 

 

 

 

 

 

GND 10

 

 

 

 

 

 

 

 

 

 

 

11

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

RD 13

 

 

 

 

 

 

 

 

 

 

 

TD 14

 

 

 

 

 

 

 

 

 

 

 

15

 

 

 

 

 

 

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.

 

 

 

 

TECHNICAL - 6

Page 31
Image 31
Hitachi CP-X995W user manual RS-232C communication, Communications setting, Protocol, Header, Command data