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SP485CN I/O Expansion & RS485 Board

SKU: DFR0014

The Arduino I/O Expansion Shield connects sensors, servos, RS485 devices to Arduino, expanding Digital I/O, Analog Input Pins (with Power/GND) and PWM Pins for servos. It has a built-in RS485 converter and a socket for wireless modules (APC220/DF-BluetoothV3). A servo power input/jumper lets users pick external/internal power. Replaced by IO Expansion Shield For Arduino(V5) .

  • Docs
  • Tech Specs

    • Pinout

    Arduino I/O Expansion Shield

    It uses an SP485CN chip to handle comms.

    The screw terminals (assuming that the three jumpers are set to '485') marked 'A' and 'B' go directly to the IC 'A' and 'B' pins (6 & 7 respectively).

    The screw terminal marked VCC goes to the IC VCC pin (8), and also to the board's +5V line (i.e. the Arduino's +5V rail).

    The screw terminal marked GND goes to the IC GND pin (5), and also to the board's GND line (i.e. the Arduino's 0V rail).

    Arduino Digital Pin RS485 Chip Connection Description
    0 RS485 Chip Data Output (Rx) with pull-up to 5V -
    1 RS485 Chip Data Input (Tx) -
    2 Rx/Tx 'Enable' High to Transmit, Low to Receive

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