Four Serial Ports RS232-RS485 for Raspberry Pi - top view

Four Serial Ports RS232-RS485 for Raspberry Pi - side 1

Four Serial Ports RS232-RS485 for Raspberry Pi - side 2

Four Serial Ports RS232-RS485 for Raspberry Pi - side 3

Four Serial Ports RS232-RS485 for Raspberry Pi - side 4

Four Serial Ports RS232-RS485 for Raspberry Pi - back view

Four Serial Ports RS232-RS485 for Raspberry Pi - 360 view

SKU: SM-I-026

Four Serial Ports RS485 and RS232 Stackable HAT for Raspberry Pi

Name: Four Serial Ports RS485 and RS232 Stackable HAT for Raspberry Pi
Brand: Sequent Microsystems
SKU: SM-I-026
Price: 50.0 USD
Availability: InStock

Four serial ports confugurable as RS232 or RS485 from DIP switches. Non-stackable

In stock

$50.00

Product variants

The latest Raspberry Pi models support up to four UART interfaces on the GPIO connector, but these signals require an external physical-layer transceiver for practical serial communication. The 4-Serial Ports HAT provides a robust and convenient way to connect Raspberry Pi systems to serial sensors, controllers, and industrial equipment. It features four independent serial ports, each selectable as RS-232 or RS-485, delivering maximum flexibility across diverse applications.

FEATURES

Version 2 of Four Serial Ports Card is now in stock with significant improvements. Each port can be individually selectable as RS485 or RS232. On board terminators available for RS485 selection.

Four serial ports, each individually configurable as RS-232 or RS-485
Per-port mode selection via DIP switches
Uses the serial ports available on the Raspberry Pi GPIO interface
Serial Port #1 connected to Raspberry Pi UART1 (GPIO pins 8, 10)
Serial Port #2 connected to Raspberry Pi UART2 (GPIO pins 21, 24)
Serial Port #3 connected to Raspberry Pi UART3 (GPIO pins 32, 33)
Serial Port #4 connected to Raspberry Pi UART2 (GPIO pins 7, 29)
Compatible with all Raspberry Pi models from Zero through Raspberry Pi 5
Stackable with other HATs (one serial card per Raspberry Pi)
DIP switches for RS-485 termination and configuration — no jumpers required
No additional software required — drivers are included in the Linux kernel
ECCN Code EAR99

3D FILES

3D Step Model V1

3D Step Model V2

DESCRIPTION

Four Serial Ports RS485 and RS232 for Raspberry Pi

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 Four Serial Ports Card is the perfect solution for connecting your Raspberry Pi to serial devices like sensors and industrial equipment. It supports RS485 and RS232 communication protocols, making it versatile for a wide range of applications. It implements four individually selectable RS485 or RS232 ports.

SPECIFICATIONS

DATA RATES:

RS485 Ports: Max 921,600 bps

RS232 Ports: Max 230,400 bps

ENABLE UART's:

To enable all the ports on Raspberry Pi 4 & 5 you need to edit the config.txt file located, depending on your Linux version, in the /boot or /boot/firmware folder. The UART section in this file must look like this:

[all]
enable_uart=1
dtoverlay=uart5
dtoverlay=uart4
dtoverlay=uart3
dtoverlay=uart2

Save the file and restart the Raspberry to activate the new settings. Checking the port activation can be made by running the command "ls /dev" which will list all the active ports.

PORT ALLOCATION

V1.X:

PORT1 -> /dev/ttyAMA4

PORT2 -> /dev/ttyAMA3

PORT3 -> /dev/ttyAMA2

PORT4 -> /dev/ttyAMA0

V2.X:

PORT1 -> /dev/ttyAMA0

PORT2 -> /dev/ttyAMA3

PORT3 -> /dev/ttyAMA4

PORT4 -> /dev/ttyAMA2

COMPATIBILITY

The Four Serial Ports Card is compatible with Raspberry Pi versions 4 and 5. Older versions of the Raspberry Pi do not have all four serial ports available on the GPIO connector and can use only PORT4.

POWER REQUIREMENTS

The card takes 5V and less than 40mA of power from the Raspberry Pi GPIO connector.

STACKING MULTIPLE CARDS

Since the card uses the Raspberry Pi UART ports, only one card can be installed on each Raspberry Pi. However, the card is equipped with an extra-tall 2x20 male-female connector and can be installed on top of any stackable HAT. Also, any Raspberry Pi HAT can be installed on top of the card

CARD LAYOUT