JVC DLA-QX1G Instruction Manual - Page 64

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 RS232C 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 Data length Parity Stop bit Flow control 9600bps / 19200bps* 8 bits None 1 bit 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 CR 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) Upon executing the received control command, the projector sends back the following response data to the computer. Header ID SP Normal Termination Status SP Parameter CR 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) 62