Hitachi CMP-4221

Anyone know if this unit uses the same serial protocol as the older hitachi plasmas.

For example Power On would be "$02,$36,$45,$30,$30,$30,$30,$30,$30,$30,$30,$30,$31,$03" and sending $05 before to turn the terminal on.

If it is the protocol is there any service menu item that needs to be set like 55hdm71?

Thanks.