Description:
This dual-channel RS-485 expansion HAT significantly enhances the communication capabilities of your Raspberry Pi. Leveraging the robust RS-485 serial communication standard, this HAT provides excellent noise immunity, supports long-distance data transmission, and enables multi-drop network configurations. The differential transmission method inherent in RS-485 effectively mitigates common-mode interference, ensuring reliable data exchange. For optimal long-distance performance, the standard necessitates a twisted-pair cable and proper termination using two terminal resistors to prevent signal reflections.
This specific expansion HAT is engineered with isolated transceivers on both channels. This crucial isolation feature dramatically improves the reliability and anti-interference characteristics of data transmission on each RS-485 port. Furthermore, the HAT incorporates comprehensive embedded protection circuits, including a lightning and surge protector and a Transient Voltage Suppressor (TVS) diode. It also features power supply isolation, collectively safeguarding your valuable Raspberry Pi development board from electrical hazards.
To ensure a secure and stable connection, the product order includes a convenient screw accessory kit, allowing users to firmly mount the expansion board directly onto their Raspberry Pi controller. This thoughtful addition simplifies setup and ensures a robust physical connection for demanding applications.
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
- Mounting Hole Size: diameter 2.5mm
- Dimension(Package Not Included): 56×65mm/2.20×2.56
Features:
- Highlights both the dual nature and the electrical isolation.
- Implies electrical/signal isolation, lightning/surge protection, and transient voltage suppression in a concise way.
- Clearly describes the RX/TX indicator functionality.
Applications:
- Agricultural Internet of Things
- Warehouse Internet of Things
- Indoor and Outdoor Environmental Monitoring
- Lighting Control
- Security Access Control System
Documents:
Package Included:
1 x DFRobot Dual-channel RS485 Expansion Hat For Raspberry Pi 4B
