Description

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

Package Includes:?
1 x 2-CH RS485 HAT
1 x 2x20PIN female pin header
1 x RPi screws pack (2pcs)