1. The reader module supports TTL level communication interface;
2. The reading distance can be adjusted by software to realize perimeter applications;
3. Provide a powerful API user interface, which can realize rapid integration and docking with the user’s existing system;
4. The design, device selection and production testing process of the reader module refer to the industrial product label, which can meet the use under various harsh conditions;
5. The communication protocol is independently developed by Xunyuan, which can be customized and expanded according to special user needs;
6. Provide supporting Xunyuan API development kit, customers can quickly complete the development.

Product interface definition

pins	name	Description	Remarks
1	GND	GND
2	P_EN	The power supply of the module is enabled. This pin defaults to a high level of 5V. When the external connection is low (0V), the F90A1 module enters a sleep state.
3	RXD	Serial interface reception, TTL level, low level is 0V, high level is 3.3V～5.0V
4	TXD	Serial interface transmission, TTL level, low level is 0V, high level is 3.3V
5	5V	DC power supply, the input voltage is 5.0V, and the maximum working current of F90A1 is 500mA.

Note: 5 PIN terminals, the pitch is 1.25mm.