JP-7941D4 Dual Frequency RFID Reader Module 13.56MHz 125KHz USB Wiegand TTL RS232 Interface Support ISO14443A/B Second Generation ID Card

JP-7941D4 Card Reader Module

Product Overview

The JP-7941D4 Card Reader Module is a versatile dual-frequency RFID/NFC reader module supporting both 13.56MHz (ISO14443 A/B) and 125kHz card standards in a single compact package. This module reads a wide range of card types — including S50, S70, FM1208, second-generation ID cards, and 125kHz proximity cards — with read distances exceeding 5cm for IC cards, 6cm for ID cards, and 2cm for second-generation ID cards. The module offers four data interface options (USB, Wiegand, UART-TTL, and UART-RS232), providing universal connectivity for PC-based systems, embedded controllers, and legacy access control panels. Housed in a 47mm × 26mm × 11mm enclosure with IP50 protection and rated for -30°C to 70°C operation, the JP-7941D4 is the ideal choice for OEMs and system integrators building multi-card access control terminals, time attendance systems, and identity verification kiosks.

Key Advantages

• True Dual-Frequency Support: Reads both 13.56MHz (ISO14443 A/B including second-generation ID cards) and 125kHz cards in a single module — eliminating the need for separate readers and simplifying system design across mixed-card environments.

• CPU Card ADPU Command Channel: Supports direct ADPU command transmission for CPU cards — enabling secure, high-level card operations such as authentication, data encryption, and file system access without complex low-level protocol handling.

• Two-Way Configuration Switching: Supports both configuration card switching and communication port-based configuration switching — providing flexible deployment options for different system requirements without physical hardware changes.

• Firmware Upgradeable via IAP: Supports In-Application Programming (IAP) for firmware updates — enabling remote feature enhancements, bug fixes, and security patches without hardware replacement.

• Active Card Reading: Continuously detects cards in the field and automatically initiates reading — eliminating the need for host polling and reducing software complexity.

• Command-Based Communication Read/Write: Supports comprehensive command-based card operations — enabling direct, host-managed card access without complex protocol stack implementation.

• Extended Read Range: Delivers IC >5cm, ID >6cm, and second-generation ID >2cm — outperforming many compact readers and providing forgiving, user-friendly operation without precise card placement.

• Low Power Consumption: Draws under 40mA normal current — ideal for battery-backed systems and large-scale deployments where multiple readers share a single power supply.

• Bicolor LED and AC Buzzer: Built-in dual-color status indicator and AC buzzer provide immediate visual and audible feedback for card detection, access granted/denied, and system status, eliminating the need for external indicator components.

Why Choose This Module?

• One Module for Mixed-Card Environments: Many access control systems manage mixed card populations — users with new 13.56MHz smart cards, legacy 125kHz proximity cards, and government employees with second-generation ID cards. The JP-7941D4 reads them all with a single module. This eliminates the need for multiple readers at entry points, simplifies system design, reduces hardware costs, and streamlines user enrollment across mixed-card environments.

• CPU Card Support for Enhanced Security: The ADPU command channel enables direct communication with CPU cards — supporting secure authentication, data encryption, and file system access. This makes the JP-7941D4 suitable for government, financial, and enterprise applications where higher security is required beyond standard memory cards.

• Flexible Configuration and Field Upgradability: The ability to switch configurations via configuration card or communication port means system integrators can deploy a single hardware module across multiple use cases — without reprogramming or physical hardware changes. Combined with IAP firmware update support, this extends product lifespan, reduces service costs, and ensures the module can be updated remotely as requirements evolve.

• Universal Connectivity with Four Interfaces: The JP-7941D4 supports USB (for direct PC integration), Wiegand (the industry standard for legacy access control panels), UART-TTL (for embedded microcontroller systems), and UART-RS232 (for industrial controllers). This interface flexibility ensures the same module works across different generations of host systems — from new cloud-connected terminals to legacy Wiegand-based controllers — reducing inventory complexity and enabling component standardization.

• Built-in User Feedback Reduces BOM Cost: The integrated bicolor LED and AC buzzer provide immediate visual and audible feedback for card detection, successful reads, errors, and access decisions. This eliminates the need for external indicator LEDs and buzzers — simplifying PCB design, reducing component count, and lowering BOM cost.

• Active Reading Simplifies Host Software: The active card reading capability continuously monitors the RF field and automatically detects cards without host polling. This reduces host CPU load, simplifies firmware development, and enables faster card detection response times — critical for high-traffic access control applications where every millisecond matters.

JP-7941D4 Dual Frequency RFID Reader Module 13.56MHz 125KHz USB Wiegand TTL RS232 Interface Support ISO14443A/B Second Generation ID Card Images