Email: sales@hyzk-electronics.com

Phone: 0086 18682384515

Address: 3rd floor, Building 6, 30 Fortress Road, Gongming Street, Guangming District, Shenzhen 518106

UART 485/232/TTL

UART / TTL / RS232 / RS485 Serial Relay Module

We provide a full series of serial port controlled relay modules covering TTL UART, RS232, and RS485 interfaces, widely

used for smart home automation, industrial control, PLC connection, agricultural irrigation equipment, DIY electronic projects,

and remote device switching control. All modules support standard Modbus RTU protocol, with stable signal transmission,

anti-interference performance, and easy secondary development.

✅ TTL UART Relay ModuleDirect compatible with MCU, Arduino, ESP32 and other mainboard TTL level signals. Short-distance & 

high-speed control, perfect for indoor DIY projects and embedded system local control.

✅ RS232 Relay ModuleStandard serial port for PC and device point-to-point communication. Simple wiring, plug-and-play, ideal for 

short-distance desktop debugging and small-scale equipment control.

✅ RS485 Relay ModuleIndustrial differential transmission design, strong anti-interference. Support long-distance communication 

up to 1200m and multi-device bus networking. The best choice for outdoor industrial automation, irrigation systems, and centralized remote control.

Our serial relay modules support multiple universal DC voltage versions to match different global power supply systems:

5V / 12V / 24V fixed voltage & 7-30V wide voltage optionalWide voltage models effectively solve unstable power supply problems in outdoor and 

industrial environments, suitable for household, commercial and industrial scenarios.

We supply diversified channel options to meet different load control demands:

1CH / 2CH: Mini size, space-saving, perfect for single solenoid valve, water pump, light switch control.

4CH / 8CH: Multi-channel independent control, suitable for multi-group equipment linkage, irrigation zoning control, and industrial IO expansion.

Each channel comes with independent indicator light, optocoupler isolation, and 10A high-current relay output, effectively isolating surge and static

electricity to protect your main control equipment.

Compatible with Modbus RTU, support custom baud rate and address setting
Optoelectronic isolation design, strong anti-interference, stable for long-term operation
Support AT command delay setting, realize intelligent timing control
Compact structure, support DIN rail mounting and PCB embedded installation
High-temperature & vibration-resistant relay core, suitable for household and industrial scenarios

Whether you need DIY small modules, household intelligent switches, or industrial long-distance centralized control equipment, our TTL/RS232/

RS485 relay modules can fully match your project requirements.

For more specification, please contact through email: sales@hyzk-electronics.com

Be a powerful and reliable provider for electronic design, manufacturing service.

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