RFID 125KHz EM4100 Card Reader RS485 Modbus RTU | IP67 PLC
RFID 125KHz EM4100 Card Reader RS485 Modbus RTU | IP67 PLC
LIHTNE MB-125 RFID 125KHz Card Reader with RS485 Modbus RTU
The LIHTNE MB-125 is a rugged industrial-grade RFID card reader operating at 125KHz, fully compatible with TK4100 and EM4100 format tags. Designed for seamless integration into PLC control systems, AGV (Automated Guided Vehicle) platforms, and other industrial automation environments, this reader communicates over RS485 using the industry-standard Modbus RTU protocol — no complex RF protocol knowledge required on your end.
With a wide DC input range of 7V–24V, built-in polarity reverse protection, an IP67 waterproof rating, and a wide operating temperature range of -25°C to +85°C, this reader is built for demanding real-world deployments. The ABS + chrome-plated metal housing adds durability, while the M12 4-PIN connector provides reliable industrial connectivity.
Key Features
- Working Frequency: 125 KHz (EM4100 / TK4100 compatible)
- Read Distance: 0–40 mm (varies by tag performance)
- Communication Interface: RS485
- Protocol: Modbus RTU — easy PLC/SCADA integration
- Power Supply: DC 7V–24V wide voltage input
- Power Consumption: Only 0.7W
- Circuit Protection: Polarity reverse protection built-in
- IP Rating: IP67 — dust-tight and waterproof
- Operating Temperature: -25°C to +85°C
- Storage Temperature: -40°C to +90°C
- Humidity: 10%–90% RH (non-condensing)
- ESD Protection: Air discharge ±15kV / Contact discharge ±8kV
- Drop Test: Survives 1.2m free fall
- Weight: 150g
- Shell Material: ABS + chrome-plated metal
- Connector: M12 cable connector, 4-PIN
Supported Tag Types
This reader supports RFID 125KHz coin cards, ID round labels, and PVC-packaged EM4100 chips — making it highly versatile for access control, asset tracking, and industrial automation workflows.
Physical & Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | -25°C to +85°C |
| Storage Temperature | -40°C to +90°C |
| Humidity | 10%–90% RH (non-condensing) |
| Weight | 150g |
| Drop Test | 1.2m free fall |
| ESD Performance | Air discharge ±15kV; Contact discharge ±8kV |
| Protection Grade | IP67 |
Electrical Specifications
| Parameter | Specification |
|---|---|
| Power Supply | DC 7V–24V |
| Power Consumption | 0.7W |
| Circuit Protection | Polarity reverse protection |
| Working Frequency | 125 KHz |
| Card Type | EM4100 / TK4100 ID Card |
| Read Distance | 0–40 mm |
| Communication Interface | RS485 |
| Communication Protocol | Modbus RTU |
LED Indicator Reference
| Indicator | Color | State | Meaning |
|---|---|---|---|
| Power-On | All | On at power-up | All LEDs off after 500ms |
| Status LED | Green | Steady On | Tag detected / card read |
| Status LED | Green | Flashing | Communication data being received |
Made in Mainland China.
For more information on RFID standards and industrial communication protocols, refer to the NIST RFID Technology Overview.
Frequently Asked Questions
Q: What RFID tag formats does the MB-125 125KHz card reader support?
A: The LIHTNE MB-125 RFID reader supports TK4100 and EM4100 format tags operating at 125KHz. Compatible tag form factors include coin cards, round ID labels, and PVC-packaged EM4100 chips — suitable for a wide variety of industrial and access control applications.
Q: How do I integrate this RFID reader into a PLC or AGV system?
A: The reader communicates via an RS485 interface using the Modbus RTU protocol, which is natively supported by most PLC platforms and SCADA systems. You simply connect the M12 4-PIN cable, power the unit with DC 7V–24V, and read tag data through standard Modbus register polling — no RF-level programming required.
Q: What is the maximum read distance of this 125KHz RFID card reader?
A: The read distance is 0 to 40mm. Actual range may vary depending on the type and quality of the RFID tag being used. For best results, use high-quality EM4100-compatible tags and ensure the tag is presented face-on to the read/write head.
Q: Is the MB-125 RFID reader waterproof or suitable for outdoor use?
A: Yes. The reader carries an IP67 protection rating, meaning it is fully dust-tight and can withstand temporary submersion in water. It operates across a wide temperature range (-25°C to +85°C), making it well-suited for outdoor, factory floor, or other harsh-environment deployments.