Product features:
The IDM4100 125KHZ RFID module adopts advanced RFID analog circuit design technology, combined with digital signal processing technology. Supports multi protocol communication, wide voltage operation, low power consumption and other advantages, widely used in access control attendance and smart door locks, storage boxes, anti-counterfeiting systems, card issuers, intelligent control systems, etc.
Basic features:
1. The IDM4100 ID card module uses 125K RF base station
2. Support EM4200, TK4100 ID cards
3. DC3.3V power supply, ultra-low power consumption: standby static current<=50UA, especially suitable for battery powered products
4. Mini size: 21MM X 17MM
5. Support serial port protocol (UART TTL), 2.54MM-6P interface: serial port bit data (8), checksum bit (none), stop bit (1),
Baud rates 9600, 19200, and 115200 can be choose.
6. Comes with watchdog
7. The module software has strong expansion functions and can customize personalized modules according to user requirements





| PIN | Signal | Direction | Description |
| J1_1 | VCC | PWR/I | DC3.3V power input |
| J1_2 | GND | G | Power ground |
| J1_3 | TXD | O | RXD TTL level serial port data output |
| J1_4 | RXD | I | NC |
| J1_5 | INT | I | NC |
| J1_6 | SOUT | O | Card status indication (high level: no card indication; low level: card indication) |
| J2_1 | TX2 | O | Antenna interface2 |
| J2_2 | TX1 | I | Antenna interface1 |









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