JVC RS-232C manual Making And Testing The Connection, Control Software, Control Protocol

JVC D-ILA Projector Remote Control Guide

Making And Testing The Connection

When the projector is first connected to the LAN, you should test the connection between the PC or controller and the projector to make sure that communication is OK before attempting to send any commands. You can use the standard ICMP “Ping” command for this.

Control Software

Most LAN compatible Custom Install Control systems that can send hex data should work with the LAN-enabled models. For initial testing with a PC, any basic TCP/IP network communication software that supports Port Selection can be used. The Hercules Setup Utility, which was suggested on page 10 for RS-232C testing, also supports TCP/IP network connections and this works well, although due to the 5-second network timeout (see below for details) you have to be quick with the mouse when controlling the projector. The “TCP Client” tab of the Hercules Setup Utility also has a Ping facility that can be used to test communication with the projector, and either this tab or the “Test Mode” tab can be used to communicate with the projector.

Control Protocol

In order to control the projector, we must first establish a network connection with the projector and then send the command. The control protocol sequence to do this is as follows:

1.The PC or Controller should first request a TCP/IP connection to the projector on Port 20554. The port number is very important, as this is the only port on which the projector will communicate.

2.When a network connection request is received, the projector will respond immediately with “PJ_OK” to confirm that it is available.

3.In order to maintain the network connection, the external controller must then respond to the projector within 5 seconds with “PJREQ”.

4.The projector will then respond immediately with “PJACK” to acknowledge that it is ready to accept a command.

5.The command can now be sent. This command can be any of the hex commands shown on pages 3-9 or any of the Acknowledgement Response Requests on pages 11- 14. The command must be sent within 5 seconds of receiving “PJACK” from the projector, otherwise the projector will close the network connection.

Looking at this as a timeline, using the same numbered steps as above, the sequence is:

	Step 1	Step 2		Step 3			Step 4		Step 5
Controller to	Request		max		>	PJREQ		max	>	Command
Projector	Connection		5 sec					5 sec
Projector to		PJ_OK					PJACK
Controller

Assuming the steps shown above are carried out correctly, the projector will respond to the command. It will then close the network connection after 5 seconds. If you wish to send more than one command, each individual command must be preceded by the connection establishment procedure shown above.

If the controller does not respond to the projector within 5 seconds in steps 3 and 5 above, the projector will close the network connection.

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