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Dual-channel RS485 Expansion Hat for Raspberry Pi 4B

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Dual-channel RS485 Expansion Hat for Raspberry Pi 4B

SKU: DFR0824 Brand: DFRobot

Want to increase reliability and anti-interference for data transmission in your industrial applications? Try the RS485 Expansion HAT for Raspberry Pi....

$49.25 AUD, inc GST

$44.77 AUD, exc GST

Available with a lead time
Expect dispatch between Dec 26 and Dec 30

Quantity Discounts:

10-25 $43.43 (exc GST)
25+ $42.54 (exc GST)

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

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

120O 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”

Documents

Parts List

RS485 Expansion HAT for Raspberry Pi ×1

Copper Column & Screw ×4

This product is listed in:

Breakouts & Modules>RS485

Product Comments

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Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

$3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
$7+ for Standard Post (typically 6+ business days, tracked)
$11+ for Express Post (typically 2+ business days, tracked)
Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

$12+ for Pack and Track (3+ days, tracked)
$16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

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