Wave 2 Channel RS485 for Pi

This is a 2-channel isolated RS485 expansion HAT designed for Raspberry Pi, adopts the SC16IS752+SP3485 solution, with embedded protection circuits such as power supply isolation, ADI magnetical isolation, and TVS diode, etc.

W17221-001

It is easy to control the 2-channel RS485 for auto transceiving via SPI interface. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for fields like industrial automation.

Quick Spec

  • UART Expansion Chip: SC16IS752
  • RS485 Transceiver: SP3485
  • Communication Interface: SPI
  • Data Rate: 300 ~ 921600 bps
  • Operating Voltage: 3.3V / 5V
  • Dimensions: 65 × 56.5mm
  • Mounting Hole Size: 3.0mm
  • Weight: 29g

Board Layout

2-CH-RS485-HAT-intro
  1. SC16IS752 UART expansion chip
  2. ADUM1412 digital isolator
  3. PC817 optocoupler
  4. SP3485 RS485 transceiver
  5. B0505LS power supply isolation module
  6. RT9193-33 power chip
  7. SMAJ12CA transient suppress diode array
  8. Auto-recovery fuse
  9. Status indicator
    • PWR: power indicator
    • RXD/TXD: UART transceiving indicator
  10. Raspberry Pi GPIO connector: for connecting Raspberry Pi
  11. RS485 terminal
  12. MCU control header: for connecting host control boards like Arduino
  13. 120Ω terminal resistor switch
  14. Interrupt pin switch
  15. Operating mode selection
    • Half-auto: A=0, B=1
    • Full-auto: A=1, B=0

Pinout

   PIN       RASPBERRY PI (BCM)       DESCRIPTION   
   VCC       5V       3.3V/5V power supply   
   GND       GND       Ground   
   SCK       P21 (SPI1 SCLK)       SPI clock input   
   MOSI       P20 (SPI1 MOSI)       SPI data input   
   MISO       P19 (SPI1 MISO)       SPI data output   
   CS       P18 (SPI1 CS)       SPI chip select   
   IRQ       P24       Interrupt output   
   EN1       P27       Channel 1 TX/RX enable: high for TX, low for RX   
   EN2       P22       Channel 2 TX/RX enable: high for TX, low for RX   

Resources

Shipping List

  • 1 x 2-CH RS485 HAT
  • 1 x 2x20PIN female pinheader
  • 1 x RPi screws pack (2pcs)


Wave 2 Channel RS485 for Pi

  • Brand: Waveshare
  • Product Code: W17221
  • Stock

    Warehouse Stock Status Location
    Centurion In Stock UR280
    Stellenbosch Out Of Stock
  • R238.00 (Inc Tax: R273.70)


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Tags: wave, 2 channel, dual channel, rs485, hat, pi, raspberry pi, rasp, pi hat