Pin

Signal type

Introduction

GPIO1

NC

NC

GPIO2

NC

GPIO3

I/O

GPIO, do not support

GPIO4

I/O

UART0_ TX

O

TX of UART

UART0_ RX

I

RX of UART

UART0_ CTS

I

CTS of UART 

UART0_ RTS

O

RTS of UART

SPI_IRQ

O

485 Control pin, after disabled 485 function presents high resistance state, enable 485 function, the default is low level; when serial port has data transmission, temporary switch to high level

nReset

I

Module reset, low level effective, pull down at least 100 ms

nReady

O

Module works normally with indication pin, low efficiency, external LED

nReload

I

Pull down 0.5-3 seconds to start Simple Config distribution network. Pull down more than 3 seconds to restore factory settings.

nLink

O

Module WiFi Connection Indicator Pin, Low Effective, External LED

WPS

I/O

WPS function pin, do not support

VCC

P

3.3V

GND

P

ground

RFIO

O

Radio Frequency Signal Output