The Multifunction Expansion Board adds additional digital inputs, analog inputs, IR zoning, the ability to read Dallas digital temperature sensors, and the ability to interface to third party I/O devices. 

Features:

• 8 digital inputs identical to HomeVision Port B (protected to +/- 30 VDC)
• 2 sets of 8 digital inputs similar to the input capability of HomeVision Port C (0 to 5 VDC)

NOTE: Any or all of the 3 sets of 8 digital inputs can instead be used as a port extender for HomeVision ports A, B, or C. Connect a ribbon cable from HomeVision terminal blocks to expansion board, then wire your I/O to expansion board terminal blocks. HomeVision can then be easily unplugged from the expansion board and moved

• 8 analog inputs (0 to 5 VDC, 8-bit resolution)
• 8 zones of infrared output. 3.5mm jacks directly drive mini-emitters (or connecting blocks if you need more outputs). If you don't need IR zoning, use these as regular IR outputs and eliminate external connecting blocks and power supplies
• Expansion port to connect to relay and opto-isolated input boards
• Memory expansion socket to support future features
• Connects to digital temperature sensors:
  • Up to 64 sensors can be connected to the same three wires. Each sensor has it's own unique address so it can be individually read.
  • Temperature range of -50 to +205 degrees F.
  • 1 degree F resolution.
  • 15 sensors can be automatically read per second.
  • Sensor made by Dallas Semiconductor (part number DS1820 or DS18S20 (DS18S20 is newer))
  • Also available from Automated Environmental Systems in enclosure (part number ATS2000D)
• Connects to input/output boards manufactured by Sylva Control Systems. These boards provide 8 relays and 8 opto-isolated inputs.

Note: The the multifunction board is not compatible with HomeVision-PC
 

Other features:

• Shares power supply with HomeVision. No need for separate supply
• Connects to HomeVision through ribbon cable
• Connect up to two Multifunction Expansion Boards to HomeVision, while also having four Sylva I/O boards and a Port Extender board
• Board dimensions: 4.0 inches by 10.5 inches
• Optional enclosure dimensions: 9.1 inches by 12.1 inches

Includes:

• Multifunction expansion board
• 3 cables to connect to HomeVision expansion connector, power jack, and infrared transmit jack
• 3 ribbon cables to connect to HomeVision terminal blocks
• Aluminum enclosure is optional