Description:
The 7941D RFID reader is an integrated high-performance radio frequency card reader with an integrated circuit and antenna. It supports ID and IC cards and provides Wiegand or UART interfaces for data output.
Its small size allows it to be widely used in devices such as fingerprint machines, attendance machines and entrance guard systems. It supports dual-frequency cards operating at 125KHz and 13.56MHz.
A radio frequency identification reader (RFID reader) is a device used to gather information from an RFID tag. Radio waves are used to transfer data from the tag to the reader. RFID systems can be classified according to the type of tag and reader.
The RFID reader can be used for low-cost applications such as office and home security, personal identification, access control, interactive toys and production control systems.
The module sends data via the UART protocol, making the interface relatively easy to use.
Features:
- Voltage: DC 7.5 ~ 12V
- Current: 40mA
- Support: 125KHz and 13.56MHz (ISO14443A) cards
- Interface: Wiegand
- Size: 47 × 26 × 5mm (includes antenna)
- Operating Temperature: -20~70 Celsius
- EM4100 Card Reading Distance: >8cm
- Mifare S50, S70, Desfire, FM1208 Card Reading Distance: >5cm
Connection Introduction:
- Power: DC 5V power supply. A linear power supply can provide better performance.
- D1 D0: Wiegand data output DATA1 and DATA0.
- FOR: Format selection. Floating means W26, and connecting to ground means W34.
Wiegand Interface Output Introduction:
- When the module detects a card, the card serial number is output through the Data 0 and Data 1 lines.
- Data 0 and Data 1 remain at a high level when there is no data output.
- Data Bit 0 generates a 400us low level on the Data 0 line.
- Data Bit 1 generates a 400us low level on the Data 1 line.
- Each data bit length is 2400us.
- Each Mifare card has a 4-byte serial number. The last three bytes are output.
- A 12-bit even check bit is added at the beginning and a 12-bit odd check bit is added at the end, resulting in 26-bit data.
- Card number: 6B 3D 12 D6
- Output data: 3D 12 D6