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Due to the need to use the same high quality switch plates as used for lighting for audio control, LEAX have developed a system which allows simple audio controls from their 8808 style button plates and 8710 style LCD plate. This LCD plate also provides command feedback to the user.

The system uses a serial interface to convert the plate LonWorks signals to a widely accepted format which is compatible with Crestron, AMX, IMI, QED and other audio control processors in multi-zone situations.
 
 
 
  System Wiring Diagram  
   
  Audio control plates sit on LonWorks Network along with lighting control plates, dimmers, occupancy sensors etc. The 8808AV may be part of a double gang plate with lighting in one half and audio on the other, or stand alone plates. The 8710AV is a double gang plate that is menu driven, allowing access to lighting functions, audio functions and blind/curtain functions.

The LonWorks Network goes to a LonWorks Serial Gateway (LSG) programmed to convert the plate button press signals from LonWorks protocol to RS232 serial protocol for the Audio Control Processor. The Processor can also light LEDs individually on the plates, query the state of the LEDs on the plates and send back text to be displayed on the LCD such as track titles.		  
     
     
 
Serial Gateway   System Capabilities
The serial gateway converts the LonWorks messages to an RS232 datastream for the Audio Control processor. The default parameters are RS232, 9600 baud, 8 bits, no parity, one stop bit, but these could be changed with the LonWorks commissioning tool to others which are
listed in the "Audio Gateway Serial Protocol" document.

The RS232 specification allows no more than 15m (2500pF) so the LSG should be located near to the Audio Control Processor, wired with a 4 core cable into a female 9 pin D type connector at the LSG end.		  
  • 100 Plates with different Keypad numbers ie. 100 zones for Crestron/AMX systems.
  • 4 zones for QED/IMI systems (their limitation).
  • Any number of plates in the same zone.
  • 9 Buttons with LEDs per 8808AV plate, One Raise/Lower button (intended to be used for Volume control) per plate (system could be expanded to 100 buttons per plate).
  • 32 sources per LSG gateway.
  • 100 menu levels in the hierarchy on the 8710AV including the source selection.
  • 100 items on each menu on the 8710AV (9900 items total per source per 8710AV, 316800 items across all sources per 8710AV)
  • Source names of 17 characters
  • Item text of 20 characters
  • 2400 to 57600 Baud for RS232, RS422 or RS485
  • 7 or 8 bits per serial frame, choice of Even, Odd or No Parity.
  • 15m cable between LSG and Audio Control Processor (RS232)
  • 500m cable on LonWorks Network before requiring LonWorks Router
  • 3 Plates per cable run off a dimmer card when used as power supply, or use external power supply for upto 10 plates per cable run (1.0A supply).
   
 
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Multiroom Systems and RS232 Control  
Blind Control