Small KNX/EIB Twisted Pair Bus coupler Unit (BCU)

Features:

• TP-UART (NCN5121 or NCN5130 in option)
• Allows bus Current Consumption up to 10mA (20mA or 40mA in option)
• 3.3v bus powered power supply
• Non Isolated bus powered direct UART interface
• Isolated UART interface (in option)
• Size is as small as 26.3mmx26.3mm
• not soldered Wago 243-131 connectors (in option)

Connections:

For maximum compatibility, the serial line is set to 19200bps and 8E1.

- Direct TPUART interface (3.3V):

• GND
• TX
• RX
• +3.3V (Output)
• GND
• CLK (uC CLK: 16MHz clock output)
• SAV (SAVEb: Save signal)
• RST (RESETb: Reset signal)

- Isolated Opto-Coupled interface (in option):

• GND (Isolated)
• TX
• RX
• VCC (3.3V to 5V Input)

- KNX Pins:

• 2x 2.54mm spaced Pin Header holes
• 2x Wago 243-131 to connect KNX Wago 243-211 terminal block
  Due to its small size and to avoid any damage on the board, please prefer soldering the Wago 243-131 connectors on a separate board.