RDM6300 RFID Card Reader Module 125khz UART Serial Built-in Antenna RF Module for Low Frequency ID Cards
Feature:
1.This product is a 125KHz RFID swipe decoding module, and integrates the antenna in the PCB. The interface adopts 5PIN interface, which are VCC, J1, Tx, J2, GND. 
2.At the same time, the power supply adds Schottky diode for anti-reverse connection protection. This module is suitable for most low frequency ID cards. 
3.The module has 3 output modes: UART output, IO direct output, and triode open-drain output.

Specification:
Supply voltage: 3.3-5V (5V recommended)
Operating current: less than 50mA, the typical value is 35mA.
Serial port parameters: baud rate 9600 bit/s, data bit 8 bit, no parity check, 1 bit stop bit
Interface function: the module adopts three kinds of interface output
1. Pin Tx uses UART to output data, the output data format is 10 ASCII codes + 1 space, and the card number is 10 data (see Figure 1). The baud rate setting is sampled in the manner of Figure 1 to receive data.
2. If the product does not need to use the UART to read the specific card number, you can directly read whether the card swipe is successful through the IO port of J2. When the card is swiped successfully, it will be accompanied by UART data output. During the data output period, the J2 port remains high. After the data output is completed or in the idle state, it always outputs a low level.
3. The J1 port and the J2 port have an opposite level, but this port is an open-drain output, and the corresponding level can be output through a pull-up resistor. It can also be connected to 12V load and 24V load. This port is designed to be upgraded for subsequent products, driving relays, etc. The sink current of the port can not exceed 100mA. (If the customer needs to directly drive the relay, the corresponding program needs to be replaced)
Product size: about 43*40*4mm
Product weight: about 10g
Packing size: about 90*90*10mm
Packing weight: about 10g

Note:
Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!
Please allow 1-2cm measuring deviation due to manual measurement.