JVC DLA-QX1G manual RS-232C external control, Communication Specifications, Command Format

Specifications (Cont.)

RS-232C external control

By connecting a computer to the RS-232C IN terminal, you can control the projector. Use a reverse connection cable as the RS- 232C connection cable.

The commands to control the projector and the response data against the received commands are explained here. For further information, please consult the dealer where you purchased your projector.

1. Communication Specifications

The communication specifications are as follows:

Baud rate	9600bps / 19200bps*
Data length	8 bits
Parity	None
Stop bit	1 bit
Flow control	None

* Initial value. To change the value, refer to page 46.

2. Command Format

2-1. Command data format (from the computer to the projector)

When sending a control command, use the following data format.

						[
	Header		ID	SP	Command		SP	Parameter
Header : Designates the head of data and the kind of data
		“!” (21h): Control command to the projector
		“?” (3Fh): Query to the projector (Asking command)
ID		: “1” (fixed)
SP		: Designates the delimiter for ID, Command, and Parameter (20h)
CR		: Designates the terminal of the data (0Dh)
* [		] is not necessary for Asking command.

2-2. Response data format (from the projector to the computer)

]

CR

Upon executing the received control command, the projector sends back the following response data to the computer.

Header ID SP Normal Termination Status SP

Header : Designates the head of data

“@” (40h): Fetches data from the projector

ID : “1” (fixed)

SP : Designates the delimiter for ID, Command, and Parameter (20h)

Normal Termination Status : “0” (30h)

CR : Designates the terminal of the data (0Dh)

Parameter

CR

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