Leema-acoustics STREAM Handbook - Stream
The following section is intended for installers, system integrators and third party manufacturers.
What is LIPS?
LIPS or Leema Intelligent Protocol System, facilitates communication between various items in a Leema audio system. It
allows units such as Tucana, Antila, Pulse or Stream to control other items in a chain. Leema’s constellation 5.2 surround
system is a good example, where a Tucana controls a Hydra and Corvus. Key information including volume level, input
selection and power control is passed through the bus enabling other units to operate in synchronisation. Intelligence is
added within each receiving unit, for example, a Hydra installed as part of a surround system ‘knows’ that it won’t be required
when listening to a stereo source such as CD. Therefore, when the Hydra ‘sees’ the CD input, it powers itself down.
Each Leema unit can be controlled via the LIPS bus. Controlling a Tucana externally for example, enables it to be used within
a home automation system.
LIPS Specifics
The LIPS bus is driven by an open-drain output. Leema can supply interface modules as required. The communication
standard follows the common RS232 format of No Parity, 8 data bits and 1 stop bit. The baud rate is 38400.
LIPS Packets
Each communication on the LIPS bus contains a packet of four data bytes as follows:
First a header is sent with a value of 255. This alerts the receivers to incoming data.
Next, a command header is sent. For a volume command, this would be 40. (see later for details).
Next, a value relating to the command is sent. For volume this would be 0 to 248.
Finally a tail byte is sent with a value of 0.
LIPS
STREAM
14