On JVC projectors RS232 and IR have nothing to do with each other. They, JVC, have provided as part of the RS232 system a command called "emulate IR function". This command takes the code number that is sent by the IR system as a data byte and performs the same action that the IR control would have performed. Ergo is is possible to send anything that the IR remote can send but without using IR in any way, but rather using RS232.

The IR and RS232 systems operate independently and both can be used at the same time. The Emulate IR command on my system is 5243, as all RS232 commands are 2 bytes long. The data for the emulate IR command is also 2 bytes long and is always of the form 73XX. The XX is the equivalent IR command number (the function ID in IR speak). The Power on command is 7305 and the power off command is 7306 when using the emulate IR sequence.

When using RS232 there is a full message structure consisting of a start byte, a unit id, the command, the data bytes and an end byte. The full sequence to send "Emulate IR power on" is 2100005243373330350A as a hex string which is to be sent. There is also a direct power on command in RS232 that is 2100005057310A as hex bytes

In the above 21 is the RS232 "start of executable" start byte, 0000 is the Projectors ID number (may be something else), 5057 is the Power command, and 31 is On as opposed to 30 which would be off.

Hope that helps