-20%

樹莓派 4B 的雙通道 RS485 擴展板 支援抗噪抗干擾 高速 485 通訊

原始價格:NT$1,430。目前價格:NT$1,150。 (未稅)

狀態: 尚有庫存 貨號: RPI-013180 分類: 標籤: , , , , ,

描述

樹莓派 4B 的雙通道 RS485 擴展板 支援抗噪抗干擾 高速 485 通訊

什麼是RS485?

RS485 是一種通用的串行通信標準,具有良好的噪聲抑制、傳輸距離遠和多點能力等特點。它使用差分傳輸方法傳輸數據,從而可以抑制共模干擾。RS485需要一對雙絞線和兩個終端電阻來消除遠距離通信時的信號反射。

 

什麼是 Modbus 協議?

Modbus 是一種主/從架構協議,用於通過 RS-485 在設備之間進行通信。它使用每個從設備的唯一地址來執行來自主設備的命令。Modbus 命令包括用於確保數據完整性的檢查代碼,可用於更改寄存器中的值、控製或讀取 I/O 端口以及從設備檢索數據。

樹莓派RS485 HAT介紹

這款專為樹莓派設計的雙通道RS485擴展HAT,採用隔離收發器實現RS485隔離,增加了各通道數據傳輸的可靠性和抗干擾性。並內置防雷防浪湧保護器、TVS二極管、電源隔離等保護電路,有效保護樹莓派開發板。

此外,訂單還包括一個螺絲配件套件,允許用戶將此板牢固地固定到 Raspberry Pi 控制器上。

RS485擴展HAT與激光測距傳感器接線圖

RS485擴展HAT與激光測距傳感器接線圖

特徵

  • 雙通道RS485
  • 電氣和信號隔離
  • 防雷電湧保護
  • 瞬態電壓抑制器
  • RX/TX數據收髮指示燈

應用

  • 農業物聯網
  • 倉庫物聯網
  • 室內外環境監測
  • 照明控制
  • 安全門禁系統

規格

  • 工作電壓:3.3V
  • RS485收發器:TP75176E
  • 串口芯片:CH432T
  • RS485通訊接口×2
  • 電源指示燈:紅色
  • TX 通信指示燈:藍色
  • RX通信指示燈:綠色
  • 120Ω終端電阻:×2
  • 接線方式:5.08-3P可插拔接線端子
  • 支持樹莓派 3B+/4B
  • 安裝孔尺寸:直徑2.5mm
  • 尺寸(不含包裝):56×65mm/2.20×2.56”

文件

貨單

  • 樹莓派RS485擴展帽×1
  • 銅柱&螺絲×4

Dual-channel RS485 Expansion Hat for Raspberry Pi 4B

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.

RS485擴展HAT與激光測距傳感器接線圖

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

APPLICATIONS

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

SPECIFICATION

  • 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
  • Mounting Hole Size: diameter 2.5mm
  • Dimension(Package Not Included): 56×65mm/2.20×2.56”

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