November 5, 2026
Our DO-918B R2000 UHF RFID 4-channel reader module is designed for long-range RFID identification, multi-antenna reading, and automated data collection. With adjustable RF output power, four SMA-Female antenna ports, and support for the ISO 18000-6C / EPC Class 1 Gen 2 protocol, this RFID reader module provides a flexible foundation for industrial RFID systems, warehouse management, access control, inventory tracking, and intelligent identification applications.
At DO RFID, we provide RFID hardware solutions for system integrators, equipment manufacturers, and businesses seeking reliable tag identification and efficient data collection. The DO-918B combines a compact module design with configurable RF performance, helping engineers integrate UHF RFID reading capabilities into their own equipment and application systems.
Whether you are developing a fixed RFID reader, a multi-point tracking system, or an automated inventory solution, our four-channel RFID module offers a practical platform for building customized RFID applications.
Feature
Support ISO18000-6C Gen 2 protocol;
Stable reading to 25m(with external 12dbi antenna, Alien H3 9662 tag)
Excellent ability in reading and writing, better to prevent collision;
Support multiple frequency standard
Good heat dissipation effect to ensure the stability of equipment
Product Specifications
| Item No. | DO-918B |
| Performance parameters | |
| Working Frequency | 902~928 MHz or 865~868MHz |
| Protocol | ISO18000-6C(EPC C1 GEN2) |
| Output power | 15~30dBm(Adjustable) |
| Reading Range | With white card & 12dBi antenna, 30m |
| RF port | Four-way SMA-Female |
| Communication Protocol | Asynchronous serial port |
| UART port | Baud Rate 115200, TTL |
| USB port | One-way USB2.0 all speed port |
| Current rating | Max 1A |
| Standby current | <60mA |
| Physical parameters: | |
| Item size | 150x120MM |
| Net weight | 12g |
| Working temperature | -20℃~+50℃ |
| Storage temperature | -30℃~+75℃ |
| Operating power | DC3.7V~5V |
Key Features of the DO-918B RFID Reader Module
The DO-918B is designed to support demanding UHF RFID identification tasks while offering flexible integration options.
- Four antenna ports: Four SMA-Female RF connectors support multi-antenna system designs.
- Long-range RFID reading: Achieve a reading distance of up to 30 meters under specified antenna and tag conditions.
- Adjustable RF output power: Configure output power from 15 to 30 dBm to suit different reading environments.
- UHF RFID protocol support: Compatible with ISO 18000-6C and EPC Class 1 Gen 2 tags.
- Multiple frequency options: Available for 902–928 MHz and 865–868 MHz frequency bands.
- Serial communication: TTL UART interface with a default baud rate of 115200.
- USB connectivity: Includes a USB 2.0 interface for supported integration workflows.
- Compact hardware design: A lightweight module for embedded RFID equipment and customized systems.
These features make the DO-918B suitable for applications requiring flexible antenna deployment, adjustable reading performance, and integration into larger automation systems.
R2000 UHF RFID Technology for Efficient Identification
The DO-918B uses the R2000 RFID platform for UHF tag identification. UHF RFID technology enables non-contact data collection, allowing compatible tags to be identified without requiring direct optical line of sight.
Compared with manual scanning workflows, UHF RFID systems can support faster identification of tagged products, cartons, equipment, and inventory items. This makes the technology particularly useful in environments where multiple tagged objects move through a reading area or where identification needs to be integrated into an automated process.
Our module supports ISO 18000-6C / EPC Class 1 Gen 2, a widely used UHF RFID air-interface standard. This enables system designers to build applications around compatible UHF RFID tags and readers.
Typical applications include:
- Warehouse and distribution center management
- Production line identification
- Logistics and shipment tracking
- Asset management
- Retail inventory control
- Equipment and cabinet identification
- Automated sorting and item verification
By integrating UHF RFID reading into your equipment, you can reduce manual identification tasks and create more efficient data collection workflows.
Four-Channel RFID Module with Four Antenna Ports
One of the main advantages of the DO-918B is its four-way SMA-Female RF interface design. The four antenna ports give equipment developers greater flexibility when planning RFID coverage across different positions or reading zones.
A multi-antenna configuration can be useful when a single antenna cannot provide sufficient coverage for the target area. For example, antennas may be positioned around a conveyor, near a storage rack, at a warehouse passage, or at several points along an automated production process.
| Antenna deployment | Example application | Main purpose |
|---|---|---|
| Conveyor-side antennas | Manufacturing and sorting | Identify tagged products moving through a reading zone |
| Warehouse passage antennas | Inventory movement tracking | Detect tagged goods passing through designated areas |
| Shelf or rack antennas | Storage management | Support identification across multiple storage positions |
| Equipment-mounted antennas | Industrial asset tracking | Identify tagged tools, components, or equipment |
| Multiple reading zones | Automated workflows | Extend coverage across different identification points |
The number of antennas, their placement, and the RF configuration should be selected according to the physical layout and the required reading performance.
For applications involving four antennas, this module offers a convenient hardware starting point for designing a multi-point RFID identification system.
Long-Range RFID Reading up to 30 Meters
Long-range identification is an important consideration in warehouse automation, logistics, vehicle-related identification, and industrial tracking. The DO-918B supports adjustable RF output power from 15 to 30 dBm, enabling engineers to configure the reader for different operating environments.
The product specifications list a reading distance of up to 30 meters when using a 12 dBi antenna and a white RFID card. The product feature description also highlights stable reading at 25 meters with an external 12 dBi antenna and an Alien H3 / 9662 tag.
Actual system performance depends on the selected tag, antenna gain, installation height, tag orientation, surrounding materials, and RF interference. Choosing a suitable antenna and optimizing its position are important steps when designing a long-range RFID system.
| Design consideration | Effect on RFID performance |
|---|---|
| RF output power | Helps determine the available interrogation power |
| Antenna gain | Influences the coverage pattern and effective reading range |
| Tag sensitivity | Affects the tag’s ability to respond to the reader |
| Tag orientation | Influences coupling between the tag and antenna |
| Installation environment | Metal structures and nearby RF sources can affect performance |
| Antenna placement | Determines coverage, reading zones, and unwanted tag detection |
For long-range projects, we recommend evaluating the complete reader, antenna, and tag configuration as one system. This approach helps engineers achieve more consistent identification results in real operating environments.
Adjustable RF Output Power from 15 to 30 dBm
Different RFID applications require different RF power settings. A compact equipment cabinet, a warehouse aisle, and a long-range identification gate may have very different coverage requirements.
The DO-918B provides adjustable RF output power from 15 to 30 dBm, giving system designers greater control over the reader’s RF performance.
| RF output power | Typical design objective |
|---|---|
| Lower power settings | Localized identification and reduced reading coverage |
| Medium power settings | General inventory and equipment identification |
| Higher power settings | Wider coverage for suitable antenna and tag configurations |
These descriptions are general design examples rather than fixed power-to-distance relationships. The appropriate setting depends on the antenna, RFID tag, surrounding environment, and application requirements.
Adjustable power is particularly useful when the reader must operate near multiple tagged objects or when the application requires a defined reading zone. Correct configuration can help balance identification range, tag detection, and system performance.
RFID Frequency Options for Different Markets
The DO-918B is available in two UHF frequency ranges: 902–928 MHz and 865–868 MHz. These options support RFID deployments across different markets and application environments.
Selecting the appropriate frequency version is an important part of RFID system planning. The reader, antennas, and RFID tags must be compatible with the intended operating band.
| Frequency option | Typical deployment consideration |
|---|---|
| 902–928 MHz | Commonly used for UHF RFID applications in North America and certain other markets |
| 865–868 MHz | Commonly used for UHF RFID applications in Europe and certain other markets |
Regional radio regulations vary, so the frequency version and operating configuration should be selected for the country where the system will be installed.
When specifying your project, identify the destination market, required reading distance, tag type, and antenna arrangement. These details help determine the appropriate hardware configuration for your RFID equipment.
Communication Interfaces and System Integration
Communication interfaces are a key consideration when integrating an RFID module into an industrial controller, embedded device, or computer-based application.
The DO-918B product title highlights RS232 and TCP/IP applications, while its listed hardware specifications include a TTL UART serial interface and a USB 2.0 interface. These interfaces provide a starting point for planning the module’s connection to a host system.
| Interface or communication method | Typical role in an RFID system |
|---|---|
| TTL UART | Serial communication between the module and compatible embedded electronics |
| RS232 | Serial communication with host equipment when the required RS232 electrical interface is provided |
| USB 2.0 | Connection to supported USB host equipment and development setups |
| TCP/IP | Network-based communication architecture for suitable reader configurations and host systems |
The communication architecture should match the electrical interface, host platform, and software requirements of the project. For example, an embedded controller may use a UART connection, while a PC-based application may use a supported USB or serial connection.
For projects involving industrial Ethernet, remote monitoring, or networked reader management, system integrators should define the required network interface and data communication method at the hardware selection stage.
This structured approach helps align the reader module with the wider application, including host software, controllers, databases, and production management systems.
RFID Tag Compatibility and Multi-Tag Identification
The DO-918B supports the ISO 18000-6C / EPC Class 1 Gen 2 protocol, allowing it to work with compatible UHF RFID tags.
UHF RFID tags are available in a wide range of form factors, including adhesive labels, cards, hard tags, industrial tags, and specialized tags for particular surfaces or operating conditions. The most suitable tag depends on the object being identified and the environment in which the system operates.
| RFID tag type | Potential application |
|---|---|
| Paper or adhesive RFID labels | Cartons, packages, and retail products |
| UHF RFID cards | Identification and item tracking |
| Industrial hard tags | Tools, equipment, and reusable assets |
| On-metal RFID tags | Metal equipment and industrial components |
| Specialized long-range tags | Applications requiring suitable extended-range performance |
Our module is designed for RFID systems where non-contact identification and efficient tag data collection are important. Selecting tags with suitable sensitivity, mounting characteristics, and protocol compatibility helps improve overall system performance.
For applications involving many tags in the same reading area, the reader’s anti-collision capabilities and the system’s RF configuration are important parts of the overall design.
Typical Applications of the Four-Channel RFID Module
The DO-918B can be incorporated into a variety of RFID-enabled devices and automation systems.
| Industry | Example application | Value of RFID integration |
|---|---|---|
| Warehousing | Inventory and stock movement tracking | Supports faster item identification |
| Logistics | Shipment and carton identification | Helps automate data collection at key checkpoints |
| Manufacturing | Work-in-process tracking | Connects tagged products with production workflows |
| Retail | Product inventory management | Supports bulk identification of compatible tagged items |
| Asset management | Tool and equipment tracking | Improves visibility of tagged assets |
| Industrial automation | Conveyor and sorting systems | Enables automated identification at defined points |
| Smart equipment | Embedded RFID identification | Adds UHF RFID functionality to customized devices |
The four antenna ports offer design flexibility for applications that require coverage at several physical positions. System developers can configure antenna placement and host-side software around the needs of the installation.
DO-918B Compared with Single-Antenna RFID Modules
A single-antenna RFID module can be suitable for a compact identification point. A four-port design provides more options when an application requires multiple antennas or broader spatial coverage.
| Comparison item | Single-antenna module | DO-918B four-port module |
|---|---|---|
| RF antenna connectors | One | Four |
| Antenna deployment | One antenna connection | Multiple antenna connections |
| Multi-position system design | May require additional hardware | Provides four RF ports in one module |
| RF output power adjustment | Depends on model | 15–30 dBm |
| UHF protocol | Depends on model | ISO 18000-6C / EPC Class 1 Gen 2 |
| Integration approach | Suitable for simpler reading points | Suitable for multi-antenna system designs |
| Example applications | Local item identification | Warehouses, conveyors, and multi-position installations |
The main benefit of choosing a four-port module is the additional flexibility available during antenna layout and equipment design. It can be a practical option for developers who need more than one antenna connection within their RFID hardware.
Antenna port count alone does not determine the number of simultaneous reading zones. The required antenna switching, reading sequence, and application logic should be considered when planning the complete system.
Compact Design for Embedded RFID Equipment
The DO-918B is designed as an RFID module rather than a complete standalone reader enclosure. This makes it suitable for equipment manufacturers and system integrators developing customized RFID products.
The module can serve as the RFID component inside a larger device, with the surrounding equipment providing the enclosure, antenna installation, power arrangement, host controller, and application-specific interfaces.
Potential integration projects include:
- Customized fixed RFID readers
- Embedded identification equipment
- Warehouse automation devices
- Industrial monitoring systems
- RFID-enabled cabinets and storage equipment
- OEM and system integration projects
When designing an embedded system, engineers should consider the available installation space, power supply, thermal conditions, RF cable routing, antenna placement, and host communication requirements.
A well-planned integration helps create a solution that fits the intended application rather than forcing the application to fit a generic reader design.
Installation and Configuration Recommendations
A successful RFID installation depends on more than the reader module alone. Antenna placement, tag selection, RF power settings, and host software all contribute to the final result.
We recommend following a structured integration process:
- Define the reading area. Identify where tags should be detected and where unwanted reads should be minimized.
- Select compatible RFID tags. Match the tag format to the target object, mounting surface, and application.
- Choose suitable antennas. Consider antenna gain, polarization, radiation pattern, and mounting position.
- Configure RF output power. Start with an appropriate setting and optimize it through application testing.
- Connect the host system. Select the appropriate supported interface for the controller or computer.
- Develop the application workflow. Define how tag data is collected, processed, stored, and associated with business operations.
- Test the complete installation. Evaluate identification performance with representative tags and real operating conditions.
Following these steps helps align the hardware configuration with the operational needs of the project.
Why Choose DO RFID?
At DO RFID, we focus on RFID readers, tags, cards, and customized identification solutions for industrial and commercial applications. Our product range supports businesses looking to introduce RFID technology into equipment, inventory workflows, and automated identification systems.
We work with equipment manufacturers, distributors, and system integrators who need RFID hardware for specific application requirements.
By choosing the DO-918B, you gain a four-port UHF RFID module with adjustable output power, standard UHF RFID protocol support, and multiple interface options for integration planning.
Our team can help you identify a suitable RFID configuration based on your target application, operating frequency, tag type, antenna requirements, and host platform.
Frequently Asked Questions
Q1. What is the DO-918B RFID reader module?
The DO-918B is a four-channel UHF RFID reader module built on the R2000 platform. It supports ISO 18000-6C / EPC Class 1 Gen 2 tags and provides four SMA-Female antenna ports for multi-antenna system designs.
Q2. What is the maximum reading distance?
The product specifications list a maximum reading distance of up to 30 meters with a 12 dBi antenna and a white RFID card. The product description also highlights stable reading at 25 meters with a 12 dBi antenna and an Alien H3 / 9662 tag.
The effective distance depends on the tag, antenna, installation, and operating environment.
Q3. Can the RF output power be adjusted?
Yes. The DO-918B supports adjustable RF output power from 15 to 30 dBm. This helps system designers configure the reader for different coverage requirements.
Q4. Which RFID protocols does the module support?
The module supports ISO 18000-6C, also known as EPC Class 1 Gen 2, for compatible UHF RFID tags.
Q5. How many antennas can be connected?
The module provides four SMA-Female RF antenna ports. The antenna arrangement and control sequence should be designed according to the requirements of the application.
Q6. Which frequency version should I choose?
The available frequency ranges are 902–928 MHz and 865–868 MHz. Select the appropriate version according to the deployment country, local radio regulations, and the frequency compatibility of the antennas and tags.
Q7. Which interfaces are available for integration?
The listed interfaces include TTL UART serial communication at 115200 bps and USB 2.0. The required host connection and any additional RS232 or TCP/IP hardware should be specified according to the intended system architecture.
Q8. What power supply does the module require?
The specified operating voltage is DC 3.7–5 V. The maximum rated current is 1 A, so the power supply should be selected to accommodate the module’s operating requirements.
Q9. What applications are suitable for this RFID module?
Typical applications include warehouse inventory, logistics tracking, production line identification, industrial asset management, conveyor systems, and customized embedded RFID equipment.
Q10. Can DO RFID help with RFID project selection?
Yes. Share your application, reading distance, target tag type, antenna arrangement, operating frequency, and host interface requirements with our team. We can help you evaluate a suitable RFID hardware configuration for your project.
Request a Quote for the DO-918B RFID Module
Looking for a four-port UHF RFID module for your next automation or identification project?
The DO-918B combines adjustable RF output power, ISO 18000-6C / EPC Class 1 Gen 2 compatibility, four SMA-Female antenna ports, and flexible integration possibilities in one RFID module.
Contact DO RFID to discuss your application requirements, including reading distance, antenna configuration, RFID tag selection, frequency range, and host communication interface. Our team will help you identify a suitable solution for your equipment development or RFID system integration project.
Do RFID is a leading China-based manufacturer with over 15 years of experience. We specialize in customized RFID readers, tags, and cards, delivering high-quality, tailored solutions that meet your unique business needs and drive seamless, efficient identification.
