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2-Channel Isolated RS485 Expansion HAT for Raspberry Pi

Waveshare  |  SKU: WS-17221
$33.15 AUD
$30.14 exc GST

Delivery and Shipping

Delivery Options

We offer several delivery choices to fit your needs:

  • FREE Delivery: $0. Enjoy Free AusPost Parcel Standard Delivery on orders over $100 in value. Exclusions may apply.
  • AusPost Untracked Letter: $3. Delivery in 3-8 business days (untracked). No refunds or replacements without proof of receiving the order.
  • AusPost Parcel Standard: $9. Tracked delivery in 2-6 business days.
  • AusPost Parcel Express: $13. Express tracked delivery in 1-3 business days.
  • Pickup: $0. Email us to arrange a pickup from our location in Huntingdale 3166 in Melbourne at support@zaitronics.com.au. More details can be found in our contact page.

Additional Information

  • Non-metro addresses in WA, NT, SA & TAS may require extra time.
  • Certain batteries (like LiPo) cannot be shipped by air, affecting Express Post availability.
  • We recommend selecting tracked options for valuable items. Untracked orders will not receive tracking numbers or refunds without proof of delivery.
  • Note: Wherever possible, we will combine orders to save on shipping and reduce packaging waste.
  • Note: Orders containing backordered item will delay delivery until all items are available

Warranty & Refund Policy

Warranty & Refund Policy

  • Standard Warranty: 12 months for all products. Low-cost hobby parts have a 90-day warranty unless safe handling is shown.
  • Exceptions: Kits and interfaceable electronics may not be covered if damaged due to misuse.
  • Returns: Contact support via your order confirmation email within 14 days of purchase. Items must be unopened and in original packaging. Proof of purchase is required.
  • Defective/Damaged Items: Notify us within 30 days for a free refund or replacement. Exclusions apply.
  • Return Shipping Costs: Paid by the customer unless the item is defective. Shipping costs are non-refundable.
Features at a glance

This is a 2-channel isolated RS485 expansion HAT designed for Raspberry Pi, adopts the SC16IS752+SP3485 solution, with embedded protection circuits such as power supply isolation, magnetical isolation, and TVS diode, etc.
It is easy to control the 2-channel RS485 for auto transceiving via SPI interface. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for fields like industrial automation.

  • Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
  • Adopts SC16IS752+SP3485 dual chip combination, converts SPI to RS485, data rate up to 921600bps
  • Allows transceiving data manually or automatically, configured by DIP switch
  • Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightningproof & anti-electrostatic
  • Onboard resettable fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, and improves shock proof performance
  • Onboard LEDs for indicating the power and transceiver status
  • Breakout SPI control pins, for connecting with host control boards like Arduino
  • Comes with online development resources and manual (examples in C and Python)
Specifications
UART expansion chip SC16IS752
RS485 transceiver SP3485
Communication interface SPI
Data rate 300 ~ 921600 bps
Operating voltage 3.3V / 5V
Dimensions 65.0 × 56.5mm
Mounting hole size 3.0mm

  1. SC16IS752
    UART expansion chip
  2. π142M61
    digital isolator
  3. PC817
    optocoupler
  4. SP3485
    RS485 transceiver
  5. B0505LS
    power supply isolation module
  6. RT9193-33
    power chip
  7. SMAJ12CA
    transient suppress diode array
  8. Self-recovery fuse 
  9. Status indicator
    PWR: power indicator
    RXD/TXD: UART transceiving indicator
  10. Raspberry Pi GPIO header
    for connecting Raspberry Pi
  11. RS485 terminal
  12. MCU control header
    for connecting host control boards like Arduino
  13. 120Ω terminal resistor switch
  14. Interrupt pin switch
  15. Operating mode selection
    Half-auto: A=0, B=1
    Full-auto: A=1, B=0
  16. Pin switching resistors

WIKI: www.waveshare.com/wiki/2-CH_RS485_HAT

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