Fingerprint Module with cable
Hardware connection:
Module through the serial communication interface, can be used directly with the 3.3V or 5V microcontroller to communicate: Module data transmission pin (4-pin TX) connected to the host computer data receiver (RXD), module data receiving pin (5 feet RX) connect on the position machine data transmission terminal (TXD).
To communicate with the host computer of the RS-232 level (eg PC), please add a level-shifting circuit between the module and the host computer (eg MAX232 circuit).
Serial protocol:
Using half-duplex asynchronous serial communication. The default baud rate is 57600bps and can be set to 9600 ~ 115200bps by command.
The transmitted frame format is 10 bits, a 0-level start bit, 8-bit data (LSB first) and a stop bit without parity bit.
Power-up delay time:
After the module is powered on, it takes about 200mS to initialize. During this time, the module can not respond to the host command.
Electrical parameters (all levels referenced to power / ground GND):
1. Power input:
| Item | Parameter | Unit | Remarks | ||
| Min | Typical | Max | |||
| Supply voltage (Vin) | 3.8 | 5 | 6 | V | Normal operating value |
| Limit voltage (Vinmax) | -0.3 | 6 | V | Exceeding this range may cause permanent damage | |
| Operating current (Icc) | 90 | 100 | 110 | mA | |
| Peak current (Ipeak) | 150 | mA | |||
2.TXD (output, TTL logic level)
| Item | Condition | Min | Max | Unit | Remarks |
| VOL | IOL=-4mA | 0.4 | V | Logic 0 | |
| VOH | IOH= 4mA | 2.4 | 3.3 | V | Logic 1 |
