RT88H01 868MHz Wireless RS485 Communication Module – Long Range 1000m
The RT88H01 Wireless Transmission Module is a long-range wireless communication module designed to transmit serial data between industrial devices, controllers, and automation systems using an RS485 interface.
Operating in the 868MHz frequency band, the module supports wireless communication distances of up to 1000 meters in open areas, with adjustable transmission power and data rates.
Featuring a built-in microcontroller, configurable communication channels, optional AES encryption, and repeater functionality, the RT88H01 provides a flexible solution for wireless data transmission in industrial automation, remote monitoring, and IoT applications.
The module can be configured for point-to-point, one-to-many, and transparent data transmission, allowing multiple devices to communicate without requiring a physical RS485 cable between locations.
Key Features
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Long-Range Wireless Communication: Transmission distance up to 1000 meters in open areas under suitable conditions.
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868MHz Wireless Operation: Designed for sub-GHz wireless communication.
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RS485 Interface: Suitable for connecting compatible industrial controllers and serial devices.
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Adjustable Transmission Power: Maximum reported output of 156mW (22dBm), with 10 configurable power levels.
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Configurable Data Rate: Supports wireless bit rates from 1.76kbps to 62.5kbps.
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Multiple Communication Channels: Up to 256 configurable channels, depending on firmware and regional frequency settings.
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Transparent Data Transmission: Enables serial data transfer between wireless nodes.
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Multiple Communication Modes: Supports point-to-point and one-to-many communication.
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Repeater Function: Supports extending wireless communication coverage through a configurable repeater mode.
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AES Encryption Support: Optional encrypted data transmission for improved confidentiality.
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Built-In Microcontroller: Handles wireless communication functions internally.
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External Antenna Connection: Supports an external antenna for wireless communication.
Technical Specifications
| Parameter |
Specification |
| Model |
RT88H01 |
| Product Type |
Wireless Serial Communication Module |
| Wireless Technology |
Sub-GHz RF |
| Operating Frequency |
868MHz Version |
| Reported Frequency Range |
854.5–931MHz (variant-dependent) |
| Communication Interface |
RS485 |
| Operating Voltage |
DC 5V–12V |
| Maximum RF Output Power |
156mW (22dBm) |
| Transmission Power Adjustment |
10 Levels |
| Wireless Data Rate |
1.76–62.5kbps |
| Maximum Communication Distance |
Up to 1000m (Open Area) |
| Communication Channels |
Up to 256 |
| Standard Data Payload |
Up to 250 Bytes |
| Encrypted Data Payload |
Up to 240 Bytes |
| Communication Modes |
Point-to-Point / One-to-Many |
| Transmission Type |
Transparent Serial Data |
| Encryption |
AES Supported |
| Repeater Function |
Supported |
| Antenna |
External Antenna Connection |
RS485 Connection and Communication
The RT88H01 uses an RS485 interface to communicate with external devices.
Typical Connection:
| Connection |
Function |
| VCC |
DC Power Supply (5V–12V) |
| GND |
Power Ground |
| RS485 A |
Differential Communication Line A |
| RS485 B |
Differential Communication Line B |
Verify the terminal markings on the actual module before wiring.
Example: Wireless RS485 Communication
- Connect the first RT88H01 module to an RS485 controller or device.
- Connect the second RT88H01 module to another compatible RS485 device.
- Supply each module with an appropriate DC power source.
- Configure compatible wireless frequency, channel, and communication parameters.
- Connect suitable antennas to both modules.
- Transmit serial data wirelessly between the connected RS485 devices.
Compatible Applications:
- PLC to PLC Wireless Communication
- Industrial RS485 Sensor Networks
- Remote Data Acquisition Systems
- Wireless Modbus RTU Links
- Industrial Monitoring Equipment
Applications
- Industrial Automation
- Wireless RS485 Communication
- Remote Sensor Monitoring
- PLC Communication Systems
- Modbus RTU Data Transmission
- Agricultural Monitoring Systems
- Industrial IoT Applications
- Remote Equipment Control
- Wireless Data Acquisition
- Building Automation Systems
Important Notes
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The module uses an RS485 interface, not a direct TTL UART connection.
- Arduino, ESP32, and Raspberry Pi GPIO applications require a suitable RS485 transceiver or interface.
- The advertised 1000m range is based on open-area conditions and may be reduced by obstacles, interference, antenna configuration, and installation conditions.
- Wireless data rates are not necessarily equivalent to the RS485 serial baud rate.
- AES encryption and repeater functionality may require additional configuration.
- The repeater mode is described as requiring modification of the M0 solder jumper; verify the manufacturer's configuration instructions before making changes.
- Ensure all communicating modules use compatible wireless settings.
- Frequency and transmission-power settings must comply with local radio regulations.
- The reported 854.5–931MHz tuning range does not mean every frequency is permitted or available on this specific 868MHz version.
- Modbus RTU operation should be tested for timing compatibility with the wireless link.
Package Includes
- 1 × RT88H01 Wireless RS485 Communication Module
- 1 × External Antenna
