The latest versions of the Raspberry Pi have up to four UART ports on the GPIO connector, but you cannot use them without a physical layer transceiver.
The Eight Serial Ports HAT uses all four ports of the Raspberry Pi, plus eight additional ports from two 32-bit ARM Cortex processors, to implement all the common serial ports in use today.
The processors talk to the Raspberry Pi using only the I2C port, with the hardware address selectable from a DIP switch. One LED for each port shows when the port is active.
Compatibility
The card is compatible with Raspberry Pi versions from Raspberry Pi 3 to Raspberry Pi 5. Older versions of the Raspberry Pi might not have all four serial ports available on the GPIO connector.
Power Requirements
The card takes 5V and less than 100mA of power from an external 5V power supply. It also provides up to 3.5A of power through the hardware watchdog to the Raspberry Pi
Stacking Multiple Cards
Two 8-Serial Ports Cards can be stacked on top of one Raspberry Pi, implementing a total of 16 serial ports.
Features
Three RS232 ports
One RS485 port with a selectable terminator
One RS422 port with a selectable terminator
One CAN port
One 1-Wire port
One M-BUS port
Compatible with all Raspberry Pi versions from 3 to 5
Two Layer Stackable
Onboard hardware watchdog
Reset pushbutton
Status LED indicators on each serial port and power
No additional software required (drivers included in the Linux kernel)
ECCN Code EAR99
Specifications
RS485 Ports: Max 921,600 bps
RS232 Ports: Max 230,400 bps
RS422 Ports: TBD
1-Wire: TBD
CAN: TBD
M-BUS: TBD
Resources
The 8-Serial Ports Card does not require software. All the software drivers are part of the Linux kernel. Setup instructions can be foundhere.
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