EBYTE ECM50-A industrial ESP32-S3 controller offers RS232, RS485, DI/DO, Ethernet, and 4G LTE or LoRa connectivity

EBYTE ECM50-A is a compact, industrial-grade programmable controller built around the ESP32-S3 wireless SoC designed for IoT and edge control applications, such as environmental monitoring and remote telemetry in the smart industry, energy, and utilities sectors

As it’s built around the ESP32-S3, it features Wi-Fi and Bluetooth LE, but the controller also supports Fast Ethernet, 4G LTE or LoRa connectivity, and offers RS232/RS485, two digital inputs, two digital outputs/relays, and two analog inputs (4–20 mA/12-bit), as well as a microSD card slot for data logging. The ECM50-A also implements various communication protocols like TCP/IP, HTTP, MQTT, and Modbus TCP master/slave. The industrial controller is designed to operate in the -40°C to 85°C temperature range.

EBYTE ECM50-A specifications:

Wireless Module – ESP32-S3-WROOM-1
- SoC – Espressif Systems ESP32-S3R8
  - CPU – Dual-core Tensilica LX7 up to 240 MHz with vector extension for AI/ML workloads
  - RAM – 512KB SRAM, 8MB PSRAM
  - ROM – 284KB
  - Wireless – WiFi 4 and Bluetooth LE 5
- Storage – 16MB QSPI NOR flash
Storage – MicroSD card slot
Networking and Wireless
- 10/100Mbps Ethernet RJ45 port
- WiFi 4 and Bluetooth 5.x via the ESP32-S3 module
- LoRa (A06/A07 only)
  - Range – up to 5 km in ideal conditions
  - Data rate – up to 62.5 kbps
  - Frequency – 410.125 – 493.125 MHz
- 4G LTE cellular connectivity (A08/A09 only)
  - LTE-FDD – B1 / B3 / B5 / B8
  - LTE-TDD – B34 / B38 / B39 / B40 / B41
  - SIM card slot
- 2x SMA antenna connectors for LoRa/4G LTE and WiFi/Bluetooth
USB – USB Type-C port for debugging and power
Serial
- ECM50-A06/A8 – RS232
- ECM50-A07/A09 – RS485
I/Os
- 2x DI (supports dry and wet contacts)
- 2x DO relays (3A @ 250VAC)
- 2x analog inputs (default 4–20 mA; voltage type selectable; 12-bit)
Misc
- LEDs – Power, Operation (programmable), Ethernet, Wi-Fi (programmable), 4G/LoRa
- Reset button
Power Supply – 8–28V DC via Phoenix terminal or 5V DC via USB Type-C debug port
Power Consumption
- Typical 0.5W when RF is fully active
- Max 1.56W when relays are fully active
Dimensions – 111.2 × 79.2 × 28 mm (excluding terminals/lugs)
Operating temperature – −40°C to +85°C

From the specifications, it’s clear that the A06 model supports RS232 with LoRa, the A07 supports RS485 with LoRa, the A08 offers RS232 with 4G LTE, and the A09 provides RS485 with 4G LTE. Everything else remains the same across the series.

EBYTE ECM50 A07 back interfaces — Back interfaces

In terms of software support, the devices run MicroPython and include various development resources, including pin lists, mechanical files, sample code, and firmware. They work with tools like Thonny, flash download utilities, and Modbus testers, and the company also provides built-in test code for GPIO, RS485/RS232, LoRa, 4G, Wi-Fi, BLE, Ethernet, and SD card functions, all can be found on Google Drive along with datasheet, user manual, pictures, and more. Some more documents are attached to the company’s products page linked below.

There are plenty of ESP32-S3-based industrial controllers, either with 4G LTE or LoRa support, and devices such as the EdgeBox-ESP-100, DFRobot Edge101, M5Stamp PLC Controller, LILYGO T-Connect Pro, and others follow a similar configuration, with some of them also offering DIN-rail mounting options.

The EBYTE ECM50-A is available on AliExpress for $35.09 and the company’s online store for $34.99. Note that you may be able to use the coupon code CNX04USA (for the US) or CNX04W (rest of the world) for a $4 discount until December 4 as part of the Black Friday and Cyber Monday promotion on AliExpress.

Debashis Das

Debashis Das is a technical content writer and embedded engineer with over five years of experience in the industry. With expertise in Embedded C, PCB Design, and SEO optimization, he effectively blends difficult technical topics with clear communication