What is RS485?
RS485 is a common serial communication standard with features such as good noise rejection, long transmission distance, and multi-drop capability. It transmits data using a differential transmission method, which allows it to suppress common-mode interference. RS485 requires a pair of twisted-pair cables and two terminal resistors to eliminate signal reflection during long-distance communication.
What is the Modbus Protocol?
Modbus is a master/slave architecture protocol used for communication between devices over RS-485. It uses unique addresses for each slave device to execute commands from a master device. Modbus commands include a check code to ensure data integrity, and can be used to change values in registers, control or read I/O ports, and retrieve data from devices.
Raspberry Pi RS485 HAT Introduction
This dual-channel RS485 expansion HAT designed for the Raspberry Pi adopts an isolated transceiver to achieve isolation for RS485, which increases the reliability and anti-interference of data transmission in each channel. And it features embedded protection circuits such as a lightning and surge protector, a TVS diode, and power supply isolation to protect the Raspberry Pi development board effectively.
Besides, the order includes a screw accessory kit that allows users to tightly fix this board onto a Raspberry Pi controller.

Wiring Diagram of RS485 Expansion HAT and Laser Ranging Sensor



Wiring Diagram of RS485 Expansion HAT and Laser Ranging Sensor

Features:

    • Dual Channel RS485
    • Electrical & signal isolation
    • Lightning & surge protection
    • Transient voltage suppressor
    • RX/TX data transmitting/receiving indicator
    Specifications:
    • Operating Voltage: 3.3V
    • RS485 Transceiver: TP75176E
    • Serial Chip: CH432T
    • RS485 Communication Interface ×2
    • Power Indicator: red
    • TX Communication Indicator: blue
    • RX Communication Indicator: green
    • 120Ω Terminal Resistance: ×2
    • Wiring Method: 5.08-3P pluggable terminal block
    • Raspberry Pi 3B+/4B Supported

    Applications:

    • Agricultural Internet of Things
    • Warehouse Internet of Things
    • Indoor and Outdoor Environmental Monitoring
    • Lighting Control
    • Security Access Control System

    Documentations:

      Package Includes:

      • 1 x RS485 Expansion HAT for Raspberry Pi
      • 4 x Copper Column & Screw

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      Dual-channel RS485 Expansion Hat for Raspberry Pi 4B

      • Brand: DFRobot
      • Product Code:NR-DFR-Dual-channel-RS485-Expansion-Hat
      • Reward Points:30
      • Availability:In Stock
      • रo 2,895.00
      • रo 2,510.00

      • Price in reward points:2990

      • 5 or more रo 2,880.00
      • 10 or more रo 2,870.00
      • 24 or more रo 2,795.00

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      Tags: DFRobot, Dual-channel, Expansion Hat, Raspberry Pi

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