ESP32 Device Modbus Monitoring and Control

fastbeeAbout 1 min

FastBee IoT Terminal

Parameter	Description
Chip	ESP32-WROOM-32U
CPU	Dual-core Xtensa LX6 @ 240 MHz
Flash	4 MB SPI Flash
SRAM	520 KB
Wireless	WiFi 802.11 b/g/n + Bluetooth 4.2 + BLE
Supply Voltage	DC 9-36V
Features	External antenna, USB flash port, configuration button

Terminal	Function	Pin
A/L	RS485-A (TX)	GPIO17
B/H	RS485-B (RX)	GPIO16
VCC	Power positive	DC 9-36V
GND	Power negative	—
DGND	Digital ground (isolated GND)	—
EGND	Protective ground (connects to device enclosure)	—
IO/L	Isolated digital I/O low-side	GPIO21
IO/H	Isolated digital I/O high-side	GPIO22

Name	Type	Description
POWER	LED	Power indicator, steady on means power is normal
STATE	LED (GPIO5)	Status indicator, lights up on low level
DATA	LED	Communication indicator, blinks during data TX/RX
BOOT	Button (GPIO0)	Long press to enter configuration mode

Use the esp32 standard environment for flashing, supporting MQTT, Modbus RTU (RS485), GPIO isolated input/output and other features.

After flashing, you can confirm the terminal online status, IP, WiFi, memory usage and uptime via the Web console.

powershell -ExecutionPolicy Bypass -File scripts\deploy.ps1 -Env esp32 -Port COM6

Industrial Acquisition Gateway: Connect Modbus RTU slave devices via RS485, acquire temperature/humidity, meter data and report to the platform
Remote Control Terminal: Isolated IO terminals control relays, solenoid valves and other actuators
Field Monitoring Node: Wide voltage supply (9-36V) suitable for outdoor or industrial site deployment

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