Isolated RS232 / RS485 / CAN / CAN FD Expansion Board for Raspberry Pi 4 & 5

The RS232/RS485 CAN Board is an industrial communication expansion board for the Raspberry Pi 4B and Raspberry Pi 5 that has multiple communication connections: 2x RS485, 1x RS232, 1x CAN FD, and 1x CAN. Each connection is electrically isolated, providing secure communication for industrial areas. The board includes protections like lightning resistance and anti-electrostatic, making it handy for trickier conditions.

Coming in an industrial rail-mount case, it makes installation a piece of cake and it is used in control systems. The case provides decent space to stack other HATs or expansion boards, and it includes reserved space for a PCIe adapter board for the Raspberry Pi 5, giving flexibility for future upgrades and expansions.

Features

• Based on Raspberry Pi 40-Pin GPIO header, suitable for Raspberry Pi 4B and Raspberry Pi 5
• SC16IS752 and SP485 combination scheme, expands SPI to 2x RS485 interface
• MCP2515 and SN65HVD230 combination scheme, expands SPI to 1x CAN interface
• MCP2518FD and MCP2562FD combination scheme, expands SPI to 1x CAN FD interface
• Raspberry UART and SP3232EEN combination scheme, expands UART to 1x RS232 interface
• TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning proof & ESD protection
• Self-recovery fuse and protection diodes, provide current/voltage stable outputs, over-current/over-voltage proof and improve shockproof performance
• Unibody power supply isolation, needs no extra power supply for the isolated terminal, provides stable current/voltage outputs of RS232, RS485, CAN, and CAN FD interfaces, and improves the anti-interference and anti-shock performance
• Digital isolation chip for safer signal isolation communication and better stability and anti-interference performance
• External power supply screw terminal for 7~36V wide voltage power input, combines with Pi5 Connector Adapter (B) to power the Raspberry Pi and the expansion board at the same time
• 120Ω terminal resistor, configured by jumper
• Reserved interrupt resistor pad for flexible switching the interrupt pin if there is pin conflict when working with other HATs
• Comes with online development resources and manual (examples for Raspberry Pi Python/C)

Specifications

Applicable Board	Raspberry Pi 4B, Raspberry Pi 5
Communication Interface	SPI + UART
Extended Industrial Connections	Connections	Chip Scheme	Baudrate
	1-ch isolated CAN FD	MCP2518FD + MCP2562FD	5kbps ~ 8 Mbps
	1-ch isolated CAN	MCP2515 + SN65HVD230	5kbps ~ 1 Mbps
	2-ch isolated RS485	SC16IS752 + SP485	300 bps ~ 921600 bps
	1-ch isolated RS232	SP3232EEN
Power Supply Methods	5V Type-C power port of Pi5 Connector Adapter (B)
	External screw terminal for DC 7-36V wide voltage input
Dimensions	L  x W x H: 154.6 x 83.7 x 59 mm

Connection Example - Raspberry Pi 5 & PCle Board

Note: Raspberry Pi 5 and PCIe board are NOT included

Resources

• Product Wiki
• Schematic

Pinout

Package Contents

1. 1x RS232 RS485 CAN Board (with ABS plastic case)
2. 1x 40-Pin cable
3. 1x Pi5 Connector Adapter (B)
4. 1x Screws pack