2-Channel Isolated RS485 Expansion HAT For Raspberry 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 magnetically isolation, and TVS diode, etc.

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.

RS485 Expansion HAT 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
• Comes with development resources and manual (examples in C and Python)

RS485 Expansion HAT Specifications

• UART expansion chip: SC16IS752
• RS485 transceiver: SP3485
• Communication interface: SPI
• Data rate: 300 ~ 921600 bps
• Operating voltage: 3.3V / 5V
• Dimensions: 65 mm × 56.5 mm
• Mounting hole size: 3.0 mm

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

Pinouts

Package Included :

• 2-CH RS485 HAT x1
• 2x20PIN female pin header x1
• PRI screws pack (2pcs) x1