SKU: SBCD-1362
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DFRobot Dual-channel Isolated RS485 HAT for Raspberry Pi

₹2,409.00 (Inclusive of all taxes)
Out of Stock

The DFRobot Dual-channel Isolated RS485 Expansion HAT provides robust, isolated RS485 communication for Raspberry Pi 3B+ and 4B. Featuring integrated lightning, surge, and TVS protection, this HAT ensures reliable, noise-resistant data transmission in industrial and demanding environments.

Features

  • Dual-channel isolated RS485 communication for enhanced reliability.
  • Utilizes TP75176E transceiver and CH432T serial chip.
  • Integrated protection against lightning, surge, and transient voltages.
  • Directly compatible with Raspberry Pi 3B+ and Raspberry Pi 4B.
  • Includes RX/TX indicators and onboard 120Ω terminal resistors.

Out of stock

Description

The DFRobot Dual-channel Isolated RS485 Expansion HAT is engineered to bring robust RS485 serial communication capabilities to your Raspberry Pi projects. RS485 is a widely adopted standard known for its excellent noise rejection, ability to transmit over long distances, and multi-drop networking support. It achieves this through differential data transmission, effectively suppressing common-mode interference, making it ideal for industrial control and monitoring applications.

This HAT stands out with its dual independent RS485 channels, each employing an isolated transceiver to achieve electrical and signal isolation. This critical feature significantly boosts the reliability and anti-interference capabilities of data transmission, safeguarding your Raspberry Pi from ground loops and electrical surges. Furthermore, it incorporates comprehensive protection circuits including lightning and surge protectors, TVS diodes, and power supply isolation, providing a resilient layer of defense for your Raspberry Pi development board in harsh operating conditions.

Key Features

  • Provides two independent, isolated RS485 communication channels.
  • Features electrical and signal isolation for enhanced system protection.
  • Integrated lightning and surge protection for robust operation in harsh environments.
  • Equipped with a Transient Voltage Suppressor (TVS) diode.
  • Visual RX/TX data transmitting/receiving indicators for easy debugging.
  • Onboard 120Ω terminal resistance, selectable for long-distance communication.
  • Operates at 3.3V, compatible with Raspberry Pi GPIO logic levels.
  • Utilizes the TP75176E RS485 transceiver and CH432T serial chip.

Applications

  • Agricultural Internet of Things (IoT)
  • Warehouse Internet of Things (IoT)
  • Indoor and Outdoor Environmental Monitoring
  • Industrial Lighting Control Systems
  • Security Access Control Systems
  • Distributed Sensor Networks

Technical Specifications

Operating Voltage3.3V DC
RS485 TransceiverTP75176E
Serial ChipCH432T
Communication Interfaces2x RS485
Power IndicatorRed LED
Communication IndicatorsGreen RX LEDs
Terminal Resistance2x 120Ω (selectable)
Wiring Method5.08-3P Pluggable Terminal Block
Supported DevicesRaspberry Pi 3B+, Raspberry Pi 4B
Mounting Hole Diameter2.5mm
Dimensions (L x W)65mm x 56mm

Frequently Asked Questions

What Raspberry Pi models are compatible with this HAT?

This DFRobot Dual-channel Isolated RS485 HAT is designed for direct compatibility with Raspberry Pi 3B+ and Raspberry Pi 4B. It leverages the standard 40-pin GPIO header for seamless integration, ensuring reliable RS485 communication for these popular single-board computers.

How does the isolation feature benefit my application?

The electrical and signal isolation provided by this HAT protects your Raspberry Pi from voltage spikes, ground loops, and common-mode noise inherent in industrial environments. This significantly increases data transmission reliability and system stability, crucial for robust long-distance communication.

What serial chips are used on this HAT?

The HAT utilizes the TP75176E as its robust RS485 transceiver for differential data handling and a CH432T serial chip for managing the serial communication with the Raspberry Pi. These components ensure efficient and stable performance for both RS485 channels.

Does this HAT require external power?

No, the DFRobot Dual-channel Isolated RS485 HAT typically draws its 3.3V operating power directly from the Raspberry Pi's GPIO header. It includes power supply isolation internally to protect the host board, eliminating the need for an additional power source for the HAT itself.

How do I enable the terminal resistors?

The HAT includes two 120Ω terminal resistors, which are essential for eliminating signal reflections in long-distance RS485 networks. These can typically be enabled or disabled via onboard jumpers or DIP switches, as per standard RS485 network termination practices.

Package Includes

  • 1x DFRobot RS485 Expansion HAT for Raspberry Pi
  • 4x Copper Columns
  • 4x Screws

Additional Information

Weight 0.052 kg
Dimensions 6.5 × 5.6 cm