modbus News - CNX Software - Embedded Systems News

August 20, 2025August 20, 2025 by Jean-Luc Aufranc (CNXSoft) - 4 Comments

80 GHz mmWave liquid level detection sensor supports ModBus, offers 40m range

I’ve just come across a no-name non-contact, high-precision 80 GHz mmWave radar sensor for liquid level detection with a 40m range, ±5mm accuracy, and Modbus communication over UART. We had seen 24 GHz and 60 GHz mmWave sensors mostly for precise motion detection, but it’s the first time I’ve seen an 80 GHz mmWave sensor, or more exactly, 79 GHz. It operates on the same principle of Frequency Modulated Continuous Wave (FMCW) radar as most other mmWave sensors and connects to an Arduino or other board over UART. It targets applications such as smart water management, industrial process control, and environmental disaster prevention/monitoring. Specifications: MCU – GigaDevice GD32F405 Arm Cortex-M4F microcontroller @ 168 MHz with 192KB SRAM, 3MB flash, 1MB code-flash Transmit frequency – 77–81 GHz (79 GHz mid frequency), 4 GHz bandwidth Output power (EIRP) – 13 to 20dBm Beamwidth (-3dB) Horizontal ±25°, Vertical ±25° With external lens: Horizontal […]

August 19, 2025August 20, 2025 by Debashis Das - 4 Comments

ESP32 Modbus gateway handles RTU, TCP/IP, and MQTT for industrial IoT

Designed by Namnam in Vietnam, the ESP32 Modbus gateway is built to communicate with PLCs and industrial sensors over Modbus RTU (RS-485) or Modbus TCP/IP (Ethernet/Wi-Fi). Designed for use in farms, factories, and electrical cabinets where reliable communication, remote monitoring, and control are required. Key features of this industrial IoT board include Modbus RTU/TCP master and slave support, automatic Wi-Fi/Ethernet switching, multi-Wi-Fi handling, watchdog timer, deep sleep, and FOTA updates via FTP. The board supports a wide input voltage range and can be programmed over USB. ESP32 Modbus gateway specifications Wireless Module – ESP32-WROOM-32 module with ESP32 dual-core processor @ 160 MHz, 520 Kbytes SRAM, 4 Mbit Flash Connectivity 10/100Mbps Ethernet RJ45 port via LAN8720A controller Wifi and WiFi 802.11 b/g/n, Bluetooth 4.2 via ESP32 RS485 – SP485EE transceiver (Serial2, auto DERE) USB – USB Type-C port for programming and power Misc Onboard Red, Blue, and Pwr LED User and […]

July 30, 2025 by Debashis Das - 1 Comment

DIN rail-compatible industrial relay board features 4 outputs, 4 analog/digital inputs, RS-485 interface

The ESC3B04 is a compact DIN rail-compatible relay board built around the ESP32-C3 Super Mini module for building Wi-Fi remote switches, voltage monitoring systems, motor control, timed automation, and RS-485-based setups. The board features four 10A relay outputs, four 0–5V/10V analog voltage inputs (also configurable as 12–24V PNP digital inputs), an RS-485 interface, and a push-button input. It operates on a 7–25V DC supply and supports direct installation in control panels or DIN-rail enclosures. ESC3B04 relay board specifications: Wireless module –16-pin ESP32-C3 Super Mini module SoC – Espressif Systems ESP32-C3FH4, single-core 32-bit RISC-V microcontroller @ up to 160 MHz; 400 KB SRAM; 4MB flash USB – 1x USB Type-C port for programming Ceramic antenna I/Os and expansion 4x relays (10A/240VAC) 4x 0-5V/0-10V analog voltage inputs (can be used as 12-24V digital inputs) Serial – RS-485 interface for Modbus or custom protocol communication Misc User button Power LED Power Supply 7-25V […]

July 26, 2025 by Debashis Das - No Comments

PD.Charger-GSM v2.5 – An industrial solar MPPT charger with Wi-Fi, LTE/GPS, and RS485

rotoDevs GmbH PD.Charger GSM v.2.5 industrial solar MPPT charger

The PD.Charger-GSM v2.5 is an industrial-grade solar and LiFePo4 charger/controller with MPPT support, designed for 2–4 cell Li-Ion/LiFePo4 batteries. With various connectivity options and a cryptographic co-processor, it’s ideal for IoT, remote solar power systems, and battery-powered industrial applications. The device features a dual-MCU architecture where the STM32 handles battery charging and monitoring, and an ESP32 manages WiFi and Bluetooth connectivity, as well as LTE/NB-IoT GSM/GPS, and RS-485 with ModBUS support. The board also offers two solar inputs with MPPT, a DC adapter input, automatic buck/boost control, SMA connectors for all RF interfaces, a USB Type-C for programming, and expansion headers for prototyping. A hardware crypto co-processor handles secure key storage, TLS encryption, and secure boot. PD.Charger-GSM v2.5 specifications: SoCs STM32L051xx MCU for battery management and monitoring ESP32-D0WDQ6-V3 dual-core Xtensa LX6 processor, 240 MHz, 16MB Flash, 8MB PSRAM Display – Supports optional PD.Screen / PD.Screen_PRO modules for real-time display of […]

July 11, 2025 by Jean-Luc Aufranc (CNXSoft) - 1 Comment

Industrial 6-Channel RP2350 relay module offers RS485 interface, Raspberry Pi Pico HAT support

Waveshare RP2350-Relay-6CH is a Raspberry Pi RP2350-based industrial 6-channel relay module with an isolated RS485 interface, 7 to 36V DC input via a terminal block, and support for Raspberry Pi Pico HATs. Each relay is isolated and can handle 250VAC/30VDC up to 10A, a USB-C port is used for firmware updates, and the module also includes a buzzer, a few LEDs, as well as Reset and BOOT buttons, with everything housed in a DIN-Rail enclosure. Waveshare RP2350-Relay-6CH specifications: Microcontroller – Raspberry Pi RP2350B CPU Dual-core Arm Cortex-M33 @ 150 MHz with Arm Trustzone, Secure boot OR Dual-core RISC-V Hazard3 @ 150 MHz Either two cores can be used. Memory – 520 KB on-chip SRAM Package – QFN-80 Relay – 6x relays Contact rating – ≤10A 250VAC/30VDC Contact form – 1NO 1NC via screw terminals Optocoupler isolation USB – USB Type-C port for power, data, and firmware flashing Serial Isolated RS485 […]

July 8, 2025July 8, 2025 by Debashis Das - 3 Comments

Kappa4310Rasp – A Modbus RTU HAT for Raspberry Pi based on IS4310 Slave stack chip

The Kappa4310Rasp is a Raspberry Pi-compatible Modbus RTU HAT designed to evaluate the IS4310 Modbus RTU Slave stack chip. This allows engineers to simulate sensor and actuator interactions using a push-button and RGB LED without requiring a custom board or soldering. The board features an RS-485 interface with two RJ45 connectors for daisy-chaining Modbus networks. The board communicates with the Raspberry Pi over I²C and supports 500 Holding Registers along with Function Codes 3 (Read Holding Registers), 6 (Write Single Register), and 16 (Write Multiple Registers). The HAT operates at 3.3V and includes jumpers to enable or disable onboard I²C pull-ups. Additional features include dedicated Tx/Rx indicator LEDs, a power LED, GPIO-connected RGB LEDs, and a push-button for real-time interaction. Kappa4310Rasp board specifications: Modbus RTU stack chip – IS4310 (I²C interface, 500 Holding Registers) Protocol support – Function Codes 0x03 (Read), 0x06 (Write Single), 0x10 (Write Multiple) Communication – RS485 […]

May 30, 2025May 30, 2025 by Debashis Das - No Comments

DFRobot Edge101 ESP32 industrial IoT controller offers isolated RS485 and CAN Bus interfaces

DFRobot Edge101 is an industrial-grade IoT controller built around the ESP32 MCU, designed as a bridge between development boards and industrial IoT systems. Housed in a full metal enclosure, it comes with various protection features including surge, ESD, lightning, overvoltage, and reverse polarity protection, and supports continuous 24/7 operation in harsh environments. It integrates RS-485, CAN bus, Ethernet, Wi-Fi, Bluetooth, and RTC, and supports expansion via a PCIe slot for 4G LTE cellular communication, making it suitable for automation, environmental monitoring, and remote data acquisition in industrial or outdoor settings. The IoT controller also offers flexible mounting options such as DIN rail or ear mounting. DFRobot Edge101 specifications: Wireless MCU – Espressif Systems ESP32 CPU – Dual-core Tensilica LX6 microcontroller @ up to 240 MHz Memory – 520 KB SRAM, 16 KB RTC SRAM Wireless – WiFi 4 and Bluetooth 4.2 Storage – 4MB SPI NOR flash, MicroSD card slot Connectivity […]

April 29, 2025April 30, 2025 by Debashis Das - No Comments

Inventia MT-718 PS battery-powered IP68 industrial telemetry logger integrates environmental sensors, cellular IoT connectivity

Inventia MT 718 PS battery operated telemetry logger with IP68 protection

Inventia MT-718 PS is a compact, battery-powered industrial telemetry logger designed for monitoring, logging, and data transmission in industrial and environmental applications, especially in areas where grid power supply and access to infrastructure are limited. It supports 2G/4G LTE Cat 1 or NB-IoT/LTE Cat M1 (eMTC) connectivity, and comes with an IP68-rated waterproof housing, allowing operation under 2 meters of water for up to 24 hours. Key features include five binary/counter inputs, two analog inputs (0–5V with 4–20mA conversion option), and built-in pressure (0–10 bar), temperature, and humidity sensors, as well as RS-485 with Modbus RTU support. The logger also features two digital outputs, can store up to 60,000 records at 1-second intervals, offers an optional OLED display, and supports OTA firmware updates. It is powered by replaceable alkaline or lithium batteries for long-term, maintenance-free operation and includes tamper detection via a lid sensor. The MT-718 OS can be used […]