Overview

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.

Features

• 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)

Specifications

• 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

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

Example

Note: the Raspberry Pi and serial cables are NOT included.

Pinouts

Dimension

Development Resources

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