2-Channel Isolated RS232 Expansion HAT for Raspberry Pi


Waveshare 17498 – 2-Channel Isolated RS232 Expansion HAT for Raspberry Pi, SC16IS752+SP3232 Solution, with Multi Onboard Protection Circuits

This is a 2-channel isolated RS232 expansion HAT designed for Raspberry Pi, adopts the SC16IS752+SP3232 solution, with embedded protection circuits such as power supply isolation, ADI magnetical isolation, and TVS diode, etc.


It is easy to control the 2-channel RS232 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+SP3232 dual chip combination, converts SPI to RS232, data rate up to 921600bps
Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic
Onboard LEDs for indicating the power and transceiver status
Breakout SPI control pins, for connecting with host control boards like Arduino
Comes with development resources and manual (examples in C and Python)


UART expansion chip: SC16IS752
RS232 transceiver: SP3232
Communication interface: SPI
Data rate: 300 ~ 921600 bps
Operating voltage: 3.3V / 5V
Dimensions: 65mm × 56.5mm
Mounting hole size: 3.0mm

What’s on Board

2-CH RS232 HAT on board resource

SC16IS752 UART expansion chip
SP3232 RS232 transceiver
ADUM1412 digital isolator
B0505LS power supply isolation module
RT9193-33 power chip
Raspberry Pi GPIO connector: for connecting Raspberry Pi
MCU control header: for connecting host control boards like Arduino
RS232 connector: 2 channels RS232 interface (RS232 9PIN male)
Transient suppress diode array
ESD protection two-way diode
Serial port status indicator
RXD1/TXD1: channel 1 transceiving indicator
RXD2/TXD2: channel 2 transceiving indicator
Power indicator
Interrupt pin switch
The interrupt pin IRQ is connected to P5 (BCM P24) by default
Changeable via 0R resistor


Note: the Raspberry Pi and serial cables are NOT included.
VCC 5V 3.3V/5V power supply
GND GND Ground
SCK P21 (SPI1 SCLK) SPI clock input
MOSI P20 (SPI1 MOSI) SPI data input
MISO P19 (SPI1 MISO) SPI data output
CS P18 (SPI1 CS) SPI chip select
IRQ P24 Interrupt output

Development Resources

Wiki : www.waveshare.com/wiki/2-CH_RS232_HAT

Note: this HAT doesn’t come with any serial cable, you may also want to pick up the following cables for easy use:

Serial Cable Dual Female Crossover: for connecting RS232 devices with male connector, OR for self transceiving test of the HAT’s 2 channels RS232
Serial Cable Male to Female Straight Through: for connecting RS232 devices with female connector

2-CH RS232 HAT x1
2x20PIN female pinheader x1
RPi screws pack (2pcs) x1


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