verts SPI to one RS485 and one RS232
Onboard resettable fuse and protection diodes, ensure the stable output of RS485 current and voltage, prevent over-current and over-voltage, improve shock resistance Onboard TVS (Transient Voltage Suppressor), can effectively suppress surge voltage and transient spike voltage in the circuit, lightningproof & anti-electrostatic Breakout SPI control pins, for connecting with Arduino and other host control boards Comes with development resources and manual (examples in C and Python) Specifications
UART EXPANSION CHIP |
SC16IS752 |
COMMUNICATION INTERFACE |
SPI |
RS485 TRANSCEIVER |
SP3485 |
RS232 TRANSCEIVER |
SP3232 |
DATA RATE |
Up to 921600bps |
OPERATING VOLTAGE |
5V |
MOUNTING HOLE SIZE |
3.0mm |
DIMENSIONS |
65mm × 56.5mm |
Standard Raspberry Pi 40PIN GPIO Header Suitable For Raspberry Pi Series Boards
RS485 And RS232 Support RS232: Full-Duplex Communication, SP3232 Transceiver
RS485: Semi/Full-Automatic Communication, SP3485 Transceiver
Overcurrent/Overvoltage Proof, High Stability! Onboard TVS (Transient Voltage Suppressor) And Resettable Fuse, Can Effectively Suppress Surge Voltage And Transient Spike Voltage In The Circuit, Improve Shock Resistance
Interface Definition 
What's On Board 
- Raspberry Pi GPIO interface
for connecting to the Raspberry Pi Board
- MCU control interface
for connecting to other host boards such as Arduino
- RS485 interface
- RS232 interface (DB9 male)
- SC16IS752 UART chip
- SP3485 RS485 Transceiver
- SP3232 RS232 Transceiver
- π142 Digital Isolator chip
- PC817 Optocoupler Isolation
- B0505LS Power Isolation Module
- RT9193-33 power chip
- TVS (Transient Voltage Suppressor)
- Resettable Fuse
- Status Indicator
PWR: Power indicator
RXD/TXD: UART transceiving indicator
- RS485 120Ω terminal resistor on/off
- Interrupt pin switching
Use D24 pin by default, can be changed to D16/D12/D25 pin by re-soldering the position of 0Ω resistor
- RS485 operating mode selection
Semi-automatic: A=1, B=0
Full-automatic: A=0, B=1
Outline Dimensions 
- PACKAGE CONTENT
Weight: 0.033 kg
- RS485 RS232 HAT x1
- 2X20PIN header x1
- Standoffs pack (2pcs) x1
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