Dual Frequency RFID Reader Module with Wiegand and Bazer Communication

The 7941D RFID reader is an integrated high-performance radio frequency card reader which includes circuit and antenna; with supporting ID and IC card, and chooses Wiegand or UART interface to output data.

Its small size allows it to be widely applied in more devices, such as fingerprint machine, attendance machine, entrance guard. It also supports Dual Frequency cards, 125KHz, and 13.56MHz cards.

A radio frequency identification reader (RFID reader) is a device used to gather information from an RFID tag, which is used to track individual objects. Radio waves are used to transfer data from the tag to a reader. RFID systems can be classified by the type of tag and reader. PRAT, ARPT, ARAT. The RFID Reader can be used for low-cost projects such as office/home security, personal identification, access control, interactive toy, and production control systems, etc. The module sends data via the UART protocol, making the interface relatively easy.

Voltage: DC 7.5 ~ 12V

Current: 40mA

Support: 125KHz and 13.56MHz (ISO14443A) card

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:

1>.Power: DC 5V power supply, choose linearity power can gain better effects

2>.D1 D0: Wiegand data output DATA1, DATA0

3>.FOR: format selection (hanging means W26, ground connection means W34)

Wiegand Interface Output Introduction:

1>. When its sensors the card, the serial number will be output via Data 0, Data 1 two data wire

2>. Data 0 and Data 1 are high level when there is no data output

3>. Data Bit 0: it will generate 400us low level on Data 0 wire

4>. Data Bit 1: it will generate 400us low level on Data 1 wire

5>. Every data length is 2400us

6>. Every Mifare card has a serial number with 4 bytes, users should output the last three bytes

7>. Add the first 12-bit even check bit in the front and add the last 12-bit odd check bit in the back, 26-bit data in total

8>. Card number is 6B 3D 12 D6

9>. Output data is 3D 12 D6