Waveshare 2-Channel Isolated RS485 Expansion HAT for Raspberry Pi

This is a Waveshare 2-Channel Isolated RS485 Expansion HAT for Raspberry Pi.

This  dual-channel isolated RS485 extension board specially designed for raspberry PI, which adopts SC16IS752+SP3485 solution embeds with protection circuits such as power supply isolation, ADI magnetical isolation, and TVS diode, etc.

This product adopts SC16IS752 as a controller. SC16IS752 is a dual-channel high-performance UART expansion chip that supports SPI and I2C interface communication. This module uses an SPI interface.

Useful link:

To do Hardware and Software setup, please follow this tutorial.

What’s on Board:

• SC16IS752 UART expansion chip
• ADUM1412 digital isolator
• PC817 optocoupler
• SP3485 RS485 transceiver
• B0505LS power supply isolation module
• RT9193-33 power chip
• SMAJ12CA transient suppress diode array
• Auto-recovery fuse
• Status indicator
  PWR: power indicator
  RXD/TXD: UART transceiving indicator
• Raspberry Pi GPIO connector: for connecting Raspberry Pi
• RS485 terminal
• MCU control header: for connecting host control boards like Arduino
• 120Ω terminal resistor switch
• Interrupt pin switch
• Operating mode selection
  Half-auto: A=0, B=1
  Full-auto: A=1, B=0

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

Note: Raspberry Pi is not included with this product.

Useful link:

To explore more about this module, please follow this link .

Features

• Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
• Adopts SC16IS752+SP3485 dual-chip combination, converts SPI to RS485, data rate up to 921600bps
• Allows transceiving data manually or automatically, configured by DIP switch
• Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic
• Onboard auto-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance
• Onboard LEDs for indicating the power and transceiver status
• Breakout SPI control pins, for connecting with host control boards like Arduino