RT18A01 RS485 Wireless Transceiver Repeater 433/868MHz (2-Pack)

RT18A01 RS485 Wireless Transceiver Repeater Module — 2-Pack (433MHz / 868MHz FSK UHF)

Extend and wirelessly bridge your RS485 networks with the RT18A01 Wireless Transceiver Repeater Module. This 2-pack delivers a plug-and-play solution for converting wired RS485 bus communication into a reliable 433MHz or 868MHz FSK radio link — perfect for PTZ cameras, PLCs, Modbus RTU devices, smart home automation, access control systems, and industrial data collection setups. With up to 500 metres of open-ground transmission range and support for master-slave topologies, these compact modules let you eliminate long cable runs without sacrificing communication integrity. Made in Mainland China.

Key Features

• Dual-Frequency Support: Operates at 433MHz or 868MHz for regional flexibility and reduced interference.
• FSK Modulation: Frequency Shift Keying delivers stable, noise-resistant wireless communication.
• Up to 500M Range: Clear line-of-sight transmission distance of up to 500 metres in open environments.
• Master-Slave Topology: With 3 or more units, configure one as master and the rest as slaves — exactly mirroring wired RS485 bus behaviour.
• Repeater Mode: Use a third module as a wireless repeater to extend range or bridge obstacles.
• Multiple Baud Rates: Transparent transmission supports 1200, 2400, 4800, 9600 (default), and 19200 bps.
• AT Command Configuration: AT mode fixed baud rate of 9600 bps for straightforward setup.
• Wide Operating Temperature: Reliable performance from -25°C to +75°C for indoor and outdoor deployments.
• Compact Form Factor: Measures just 58.5 × 30 × 13.8 mm (antenna excluded) for easy integration.

Technical Specifications

How to Use (Requires ≥ 2 Modules)

• 2 Modules: Module 1 and Module 2 communicate directly with each other — bidirectional wireless RS485 link.
• 3 Modules: Module 1 transmits, Module 2 acts as a wireless repeater (multiple repeaters supported) to extend distance, and Module 3 receives.
• 3+ Modules (Master-Slave): Designate one module as the master device; all others become slaves. The master transmits and all slaves receive; any slave can transmit back to the master and all other slaves — only one device may transmit at a time, just like a wired RS485 bus.

Typical Applications

• PTZ camera control systems
• Modbus RTU temperature and environmental sensors
• PLC (Programmable Logic Controller) communications
• LED lighting controllers
• RS485 relay systems
• Remote monitoring and telemetry systems
• Wireless metering and utility data collection
• Smart home and building automation
• Access control and identification systems
• Baby and security monitoring systems

Package Contents

• 2 × RT18A01 RS485 Wireless Transceiver Repeater Module

Note: Due to screen colour variation, actual product colour may differ slightly from images. Please allow ±1–3 cm measurement tolerance.

For technical guidance on industrial wireless communication standards, visit the NIST Communications Technology Laboratory.

Frequently Asked Questions

Q: What is the maximum wireless range of the RT18A01 RS485 transceiver module?

A: In open-ground conditions with clear line of sight, the RT18A01 wireless repeater module achieves a transmission range of up to 500 metres. Range may be reduced in environments with obstacles, walls, or radio interference.

Q: Can I use more than 2 RT18A01 modules to extend coverage further?

A: Yes. With 3 or more modules, one unit can be configured as a wireless repeater to relay signals and extend the total transmission distance. In master-slave mode with 3+ modules, one acts as the master and all others as slaves — identical in behaviour to a conventional wired RS485 bus.

Q: What baud rates does the RT18A01 support?

A: In transparent transmission mode, the module supports 1200, 2400, 4800, 9600 (factory default), and 19200 bps. In AT command configuration mode, the baud rate is fixed at 9600 bps.

Q: Is the RT18A01 compatible with Modbus RTU and PLC systems?

A: Yes. The RT18A01 RS485 wireless module is fully compatible with Modbus RTU protocols and PLC RS485 interfaces. Its transparent transmission mode allows it to function as a seamless wireless drop-in replacement for a wired RS485 connection, making integration with existing industrial control and automation equipment straightforward.