You can find our RapidHA Serial Protocol v1.7 here.
Please see the following page for details on possible firmware upgrade paths. Firmware releases can be found below.
RapidHA 1.7 includes an expansion of the serial interface to application sleepy functionality. New sleep control frames under the Utility command group (PH: 0x55) provide the user with a wake-up handshaking scheme, as well as total and accurate control of application sleep cycles.