DescriptionThe M5Stamp RS485 Module is a compact Stamp PWR485 board for adding RS485 communication to embedded devices. The M5Stamp RS485 Module converts a 3.3V TTL serial signal from an MCU into a differential signal compatible with the RS485 electrical standard, making it suitable for long-distance serial links, sensor data acquisition, and industrial bus nodes.This RS485 communication module uses the SP485EEN-L/TR transceiver, provides two parallel RS485 interface connections, and supports 9-24V input through the PWR485 interface with internal DC-DC step-down to 5V. The RS485 communication module fits tight products at 20.0 x 4.6 x 23.0mm while supporting SMT, DIP, and flying-lead mounting forms.Features M5Stamp RS485 Module for compact RS485 communication expansion in embedded systems. RS485 communication module based on the SP485EEN-L/TR transceiver, suitable as a Modbus RS485 module for compact nodes. Converts 3.3V TTL serial signals into RS485 differential signals. Two parallel RS485 interface connections allow two devices to be connected at the same time. PWR485 interface supports 9-24V input power and internal DC-DC step-down to 5V. Recommended stable baud rates are 9600bps and 115200bps, with maximum tested communication at 128000bps. Red power indicator for quick status checking. Multiple forms support SMT, DIP, and flying-lead integration, with reflow soldering temperature up to 230°C. Specifications Specification Parameter RS485 Transceiver SP485EEN-L/TR Input Voltage PWR485 interface: 9-24V input power / TTL side input voltage: 5V Recommended Baud Rate 9600bps / 115200bps Operating Current DC [email protected] / DC [email protected] / DC [email protected] Input Logic Level 3.3V Size 20.0 x 4.6 x 23.0mm Weight 5.1g Package Size 138.0 x 93.0 x 10.0mm Gross Weight 7.3g Applications RS485 communication interface expansion using the M5Stamp RS485 Module. Modbus RS485 module use in bus node communication, field devices, and compact controller networks. RS485 sensor data acquisition for compact controllers and distributed nodes. Industrial IoT terminal designs that need a small RS485 communication module for reliable field wiring. Serial communication extension where an RS485 communication module bridges MCU boards that expose 3.3V TTL UART signals. Product List 1 x Stamp PWR485 1 x HT3.96-4P female socket 2 x HY2.0-4P female sockets (blue + white) 1 x L-shaped hex key 1.5mm (compatible with M2 screws) Other ContentThe Modbus RS485 module design supports a PWR485-side input range of 9-24V and a TTL-side input voltage of 5V. Operating current is listed as 3.2mA at DC 5V, 2.8mA at DC 12V, and 2.1mA at DC 24V, which helps when estimating system power for compact Modbus RS485 module nodes.For integration, use the schematic together with the Arduino RS485 and Modbus libraries. The M5Stamp RS485 Module is best suited for compact installations where UART-level communication needs to be bridged to an RS485 bus without a large adapter board, especially when a Modbus RS485 module must fit into a small enclosure.Resources Stamp PWR485 documentation Stamp PWR485 schematic PDF UART test example Arduino Modbus library Arduino RS485 library FAQWhat does the M5Stamp RS485 Module do?The M5Stamp RS485 Module converts MCU 3.3V TTL serial signals into RS485 differential signals for bus communication.Can it be used for Modbus devices?Yes. This Modbus RS485 module is suitable for bus node communication, and the resources include an Arduino Modbus library.What input voltage does the PWR485 side support?The PWR485 interface supports 9-24V input power, with internal DC-DC step-down to 5V.How many RS485 devices can be connected directly?This RS485 communication module provides two parallel RS485 interface connections, allowing two devices to be connected at the same time.Which baud rates are recommended?The listed stable communication baud rates are 9600bps and 115200bps, with maximum tested communication at 128000bps.
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