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Green rectangular circuit board with 40-pin header and two DB9 ports

NuoTo

NuoTo 2-Channel Isolated RS232 Expansion HAT for Raspberry Pi SC16IS752+SP3232 921600bps 65×56.5mm

SKU CH-S00V-89DP2

Adds two isolated RS232 ports to a Raspberry Pi via SPI with 921600 bps throughput and onboard TVS protection

  • 2 isolated RS232 channels for industrial reliability
  • SPI control up to 921600 bps for fast data transfer
  • SC16IS752 and SP3232 chips ensure stable communication
  • TVS diode plus ADI magnetic isolation protect against surges
  • Fits Raspberry Pi 40-pin GPIO with 65×56.5 mm footprint

2-Channel Isolated RS232 HAT for Raspberry Pi

This expansion HAT adds two isolated RS232 serial ports to any Raspberry Pi board using the standard 40-pin GPIO header. It uses an SC16IS752 UART chip paired with an SP3232 transceiver to convert SPI signals to RS232 levels. The board operates at 3.3V or 5V and supports data rates from 300 to 921600 bps for industrial communication tasks.

Ideal for industrial automation

Engineers connecting PLCs, sensors, or older serial devices to a Raspberry Pi will benefit from the onboard protection circuits. The design includes power supply isolation, ADI magnetic isolation, and a TVS diode to suppress surge and transient voltages. Builders who need USB, CAN, or Ethernet interfaces instead should look at other expansion boards.

Straightforward SPI installation

The HAT mounts directly onto the 40-pin header using 3.0mm mounting holes and measures 65mm by 56.5mm. Development resources include C and Python examples to accelerate driver integration. Care must be taken to match the host voltage level and configure the SPI bus correctly to avoid communication errors.

How it compares

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Price $42.99
Cheaper than about 98% of the 1,735 comparable items (median $564.99).

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Specifications

Processor
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Questions about this item

Which Raspberry Pi boards have the 40-pin GPIO header this HAT needs?

The HAT plugs into the standard 40-pin GPIO extension header found on Raspberry Pi series boards.

Will the SC16IS752+SP3232 chips talk to legacy RS232 gear running at 300 bps?

Yes, the data rate range is 300 to 921600 bps, so older equipment at 300 bps is supported.

How do I confirm the 2-channel RS232 link is live after wiring?

Onboard LEDs indicate power and transceiver status for each channel.

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