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NT$1,430 原始價格:NT$1,430。NT$1,150目前價格:NT$1,150。 (未稅)
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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
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.
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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