Serial Pi RS232 Expansion board
Created: 11/05/2016 | Last Updated: 30/03/2022
This item has been replaced with the Serial Pi Plus and Serial Pi Zero
Go to the Serial Pi Plus.
Go to the Serial Pi Zero.
- RS232 Master Port.
- Control the Raspberry Pi over RS232 or connect to external serial accessories.
- Stackable with other Raspberry Pi accessory boards.
- Mounting hole for use with the AB Electronics UK mounting kit (sold separately)
The Serial Pi is a communication board supporting the RS232 serial protocol.
Please note that you can only use one Serial Pi board on a Raspberry Pi.
The RS232 port is connected to the UART port on the Raspberry Pi using a MAX3232 interface. The MAX3232 IC converts the 3.3V UART port to RS232 voltages allowing communication with RS232 compatible devices over a DB9 serial cable or with the use of a null-modem cable the board allows terminal access with linux on the Raspberry Pi using a terminal application. The RS232 port can be accessed through the DB9 port or the solder points on the PCB.
An array of 2.54mm pitch holes with 3.3V and 5V connections are also provided on the PCB allowing you to build additional circuits on the board.
Serial Pi Datasheet
Click to download schematic PDF.
Click image to enlarge
Sample Code & Tutorials
Configuring the RS232 communication on the Raspberry Pi
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