Usr USR-WIFI232-S User manual

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USR-WIFI232-S/T/G2
USR-WIFI232-S/T/G2
USR-WIFI232-S/T/G2
USR-WIFI232-S/T/G2 /H
/H
/H
/H
Low
Low
Low
Low Power
Power
Power
Power WiFi
WiFi
WiFi
WiFi Module
Module
Module
Module User
User
User
User Manual
Manual
Manual
Manual V2.
V2.
V2.
V2. 3
3
3
3
Overview
Overview
Overview
Overview of
of
of
of Characteristic
Characteristic
Characteristic
Characteristic
Support IEEE802.11b/g/n Wireless Standards
Based on Self-developed High Performance MCU
Ultra-Low-Power Applications with Excellent Power Save
Support UART/PWM/GPIO Data Communication Interface
Support Work As STA/AP Mode
Support Smart Link Function (APP program provide)
Support N etwork C onfiguration by Audio. (USR-WIFI232-H)
Support USRLINK Function (Fast set SSID)
Support Wireless Upgrade Function
Support WPS Function
Support Multi-TCP Link (5 Channel) Ap p lication
Support Internal/External(I-PEX/SMA) Antenna Option
Single +3.3V Power Supply
Smallest Size:
USR-WIFI232-S 22mm x 13.5mm x 2.3mm , SMT Footprint
USR-WIFI232-T 22mm x 13.5mm x 6mm , 1x10 2mm Connector
USR-WIFI232-G2 23.1mm x 32.8mm x 2.7mm , SMT Footprint
USR-WIFI232- H 23.1mm x 32.8mm x 2.7mm , SMT Footprint
FCC/CE Certificated

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C
C
C
C atalogue
atalogue
atalogue
atalogue
1、Quick start ......................................................................................................................................................... 6
1.1 Hardware connect ...................................................................................................................................... 6
1.2 Network connection ................................................................................................................................... 6
1.3 communication test ................................................................................................................................... 7
1.4 Application Examples ................................................................................................................................. 8
1.4.1 Wireless remote control applications ................................................................................................... 8
1.4.2 Remote connectivity applications ......................................................................................................... 9
1.4.3 Transparent T ransmission ...................................................................................................................... 9
2、Product Overview ........................................................................................................................................ 11
2.1 General Description .................................................................................................................................. 11
2.2 Device Features ........................................................................................................................................ 11
2.3 Device Paremeters ................................................................................................................................... 12
2.4 Modules feature comparison .................................................................................................................. 13
2.5 Key Application ......................................................................................................................................... 13
2.6 Package Information ................................................................................................................................ 14
2.6.1 Recommended Reflow Profile ............................................................................................................. 14
2.6.2 Device Handling Instruction (Module IC SMT Preparation) ............................................................ 14
2.6.3 Shipping Information ............................................................................................................................ 15
3、Hardware Introduction ................................................................................................................................... 16
3.1 Pins Definition ........................................................................................................................................... 16
3.1.1. USR-WIFI232-S Pins Definition .......................................................................................................... 16
3.1.2. USR-WIFI232-T Pins Definition .......................................................................................................... 18
3.1.3. USR-WIFI232-G2 Pins Definition ....................................................................................................... 20
3.1.4. USR-WIFI232- H Pins Definition ......................................................................................................... 23
3.2 Electrical Characteristics .......................................................................................................................... 26
3.3 Mechanical Size ........................................................................................................................................ 26
3.3.1 USR-WIFI232-S ..................................................................................................................................... 26
3.3.2 USR-WIFI232-T ..................................................................................................................................... 27
3.3.3 USR-WIFI232-G2 /H .............................................................................................................................. 28
3.4 Antenna ..................................................................................................................................................... 29
3.4.1 USR-WIFI232-S ..................................................................................................................................... 29
3.4.2 USR-WIFI232-T ..................................................................................................................................... 30
3.4.3 USR-WIFI232-G2 /H .............................................................................................................................. 31
3.5 Evaluation Kit ............................................................................................................................................ 31
3.6 Typical Application Hardware ................................................................................................................. 33
3.6.1 UART Application Hardware ................................................................................................................ 33
3.6.2 PWM/GPIO Application Hardware ...................................................................................................... 33
4、Modules function description ........................................................................................................................ 34
4.1 Work Mode ................................................................................................................................................ 34
4.1.1 T hroughput mode ................................................................................................................................. 34
1. Throughput mode brief introduction ....................................................................................... 34
2. UART Frame Scheme ................................................................................................................. 35

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4.1.2 Command Mode .................................................................................................................................... 36
4.1.3 GPIO/PWM Mode .................................................................................................................................. 36
4.2 Wireless Networking ................................................................................................................................ 37
4.2.1 STA WI-FI Mode .................................................................................................................................... 38
4.2.2 AP WI-FI Mode ...................................................................................................................................... 38
4.2.3 Encryption .............................................................................................................................................. 38
4.3 Socket Communication ............................................................................................................................ 39
4.3.1 Socket A ................................................................................................................................................. 39
4.3.2 Socket B ................................................................................................................................................. 39
4.4 Network configuration by audio ............................................................................................................. 40
4.4.1. Introduction .......................................................................................................................................... 40
4.4.2. P eripheral circuit .................................................................................................................................. 40
4. 5 Fast access Wi-Fi(usrlink) ....................................................................................................................... 41
4. 6 Searching Wi-Fi protocol & Network AT Command ............................................................................. 43
4. 7 Reporting MAC .......................................................................................................................................... 44
4. 8 Parameter configuration .......................................................................................................................... 44
4. 9 Firmware and web upgrade .................................................................................................................... 44
5、Module Parameter configuration .................................................................................................................. 46
5.1 Web ............................................................................................................................................................ 46
5.1.1 Web Brief Description ........................................................................................................................... 46
5.1.2 Open Web Management Interface ..................................................................................................... 46
5.1.3 Fast Set SSID Page (usrlink) ................................................................................................................ 47
5.1.4 System Page .......................................................................................................................................... 48
5.1.5 STA Setting Page .................................................................................................................................. 48
5.1.6 AP Setting Page ..................................................................................................................................... 49
5.1.7 Network Setting Page ........................................................................................................................... 50
5.1.8 UART Setting Page ............................................................................................................................... 50
5.1.9 Account Management Page ................................................................................................................. 50
5.1.10 Upgrade Software Page ..................................................................................................................... 51
5.1.11 Restart Page ........................................................................................................................................ 51
5.1.12 Restore Page ....................................................................................................................................... 52
5.2 AT command ............................................................................................................................................. 52
5.2.1 Switch to Command Mode .................................................................................................................. 53
5.2.2 AT command Overview ........................................................................................................................ 54
5.2.3 AT command introduction ................................................................................................................... 55
1) AT+E .................................................................................................................................................... 57
2) AT+WMODE ........................................................................................................................................ 57
3) AT+ENTM ............................................................................................................................................ 58
4) AT+TMODE ......................................................................................................................................... 58
5) AT+MID ............................................................................................................................................... 58
6) AT+RELD ............................................................................................................................................. 58
7) AT+Z .................................................................................................................................................... 58
8) AT+H .................................................................................................................................................... 58
9) AT+CFGTF ........................................................................................................................................... 59

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10) AT+UART .......................................................................................................................................... 59
11) AT+UARTF ........................................................................................................................................ 59
12) AT+UARTFT ...................................................................................................................................... 60
13) AT+UARTFL ...................................................................................................................................... 60
14) AT+UARTTE ...................................................................................................................................... 60
15) AT+PING ........................................................................................................................................... 60
16) AT+SEND .......................................................................................................................................... 61
17) AT+RECV ........................................................................................................................................... 61
18) AT+NETP ........................................................................................................................................... 61
19) AT+MAXSK ........................................................................................................................................ 62
20) AT+TCPLK ......................................................................................................................................... 62
21) AT+TCPTO ........................................................................................................................................ 62
22) AT+TCPDIS ....................................................................................................................................... 63
23) AT+SOCKB ........................................................................................................................................ 63
24) AT+TCPDISB ..................................................................................................................................... 63
25) AT+TCPTOB ...................................................................................................................................... 64
26) AT+TCPLKB ....................................................................................................................................... 64
27) AT+SNDB .......................................................................................................................................... 64
28) AT+RCVB ........................................................................................................................................... 65
29) AT+WSSSID ...................................................................................................................................... 65
30) AT+WSKEY ....................................................................................................................................... 65
31) AT+WANN ......................................................................................................................................... 66
32) AT+WSMAC ...................................................................................................................................... 66
33) AT+WSLK .......................................................................................................................................... 66
34) AT+WSLQ .......................................................................................................................................... 66
35) AT+WSCAN ....................................................................................................................................... 67
36) AT+WSDNS ....................................................................................................................................... 67
37) AT+LANN .......................................................................................................................................... 67
38) AT+WAP ............................................................................................................................................ 68
39) AT+WAKEY ....................................................................................................................................... 68
40) AT+WAMAC ...................................................................................................................................... 68
41) AT+WADHCP .................................................................................................................................... 69
42) AT+WALK .......................................................................................................................................... 69
43) AT+WALKIND ................................................................................................................................... 69
44) AT+PLANG ........................................................................................................................................ 69
45) AT+WEBU ......................................................................................................................................... 70
46) AT+NTPRF ........................................................................................................................................ 70
47) AT+NTPEN ........................................................................................................................................ 70
48) AT+NTPTM ........................................................................................................................................ 70
49) AT+WRMID ....................................................................................................................................... 71
50) AT+ASWD ......................................................................................................................................... 71
51) AT+MDCH ......................................................................................................................................... 71
52) AT+TXPWR ....................................................................................................................................... 71
53) AT+WPS ............................................................................................................................................ 72

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54) AT+WPSBTNEN ................................................................................................................................ 72
55) AT+SMTLK ........................................................................................................................................ 72
56) AT+LPTIO ......................................................................................................................................... 72
57) AT+USERVER ................................................................................................................................... 73
58) AT+ CUSTOMER ................................................................................................................................ 73
59) AT+ RPTMAC ..................................................................................................................................... 73
60) AT+ WRRPTMAC ............................................................................................................................... 73
61) AT+ WIFI ........................................................................................................................................... 74
Appendix A: HW Reference Design ...................................................................................................................... 75
USR-WIFI232-S Evaluation Kit Schematic ................................................................................................... 75
USR-WIFI232-T Evaluation Kit Schematic ................................................................................................... 76
USR-WIFI232-G2 Evaluation Kit Schematic ................................................................................................ 77
USR-WIFI232- H Evaluation Kit Schematic ................................................................................................... 78
Appendix B: GPIO/PWM CONTROL WITH NETWORK COMMANDS ................................................................ 79
Appendix C: HTTP PROTOCOL TRANSFER .......................................................................................................... 84
Appendix D: Contact Information ................................................................................................................... 87
Appendix E: Disclaimer .......................................................................................................................................... 87
Appendix F: Update History .................................................................................................................................. 87

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1
1
1
1、
、
、
、Quick
Quick
Quick
Quick start
start
start
start
USR-WIFI232 series product is used to transm it data between RS232 and WIFI
TCPIP transparently, user can update the product to WIFI control without know ing the
WIFI and TCPIP detail. All the convert work is done by the module . F or users, the
RS232 side is only as a serial device,the WIFI side is TCPIP Socket data. User can setup
the work detail by sample settings which can setup via inside web pages or RS232 port .
T he setup work only need do once, then it will save the setting forever.
This chapter is a user guide for USR-WIFI232 series products. W e suggest users
follow the guide to test module at first, and will have a good understanding of the
modules. U sers can also choose the chapter which you are interested in to read. For
specific details and instructions, please refer to the following chapters.
1.1 Hardware connect
In order to test WIFI module, we need connect module RS232 to PC and also WIFI
to PC.
In order to test the communication between serial and WIFI network, we need to
connect the serial port to PC, and also connect WIFI networks to PC. Due to the special
need both WIFI and serial, we use PC which add USB WIFI network Card such as the
following picture.
RS232
WIFI
Figure 1 hardware connection diagram
About the serial connection , because the module RS232 is 3.3V TTL lev el , the
computer can not connect to module directly, the user needs to have a TTL to RS232
adapter cable and then connect to the computer. in order to facilitate the test , we
provide USR-WIFI232-S/T/G2 /H evaluation board for users to choose.
1.2 Network connection
The following is the USR-WIFI232-T module example , except SSID , other modules

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are the same to USR-WIFI232-T . Open Wi-Fi , search network, as shown in below,
USR-WIFI232-T is the default network name (SSID) of the module.
Figure 2 WIFI Search
Join the network , choose to automatically obtain IP, WIFI module supports DHCP
Server feature and is enabled by default.
Figure 3 WIFI connection
Now, n link led of USR-WIFI232-T Evaluation Board is lighting.
1.3 communication test
Module ’ s default setting:
SSID
SSID
SSID
SSID : USR-WIFI232-T ;
Encryption
Encryption
Encryption
Encryption mode
mode
mode
mode : open , none ;
UART
UART
UART
UART : 115200,8,1,None ;
Network
Network
Network
Network parameters
parameters
parameters
parameters : TCP,Server,8899,10.10.100.254 ;
IP
IP
IP
IP : DHCP,0.0.0.0,0.0.0.0,0.0.0.0

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We just need to follow the parameters of the corresponding set of network
communication parameters, you can make serial <- - > WIFI communication, the steps
are as follows:
1. Open test software USR-TCP232-Test ;
2. COM Settings area (left):
C hoose COM port witch has connect the module, there is COM3, choose band
rate to 115200, this is the default band rate of WIFI module, Click Open COM
port.
3. Net Settings area (right):
C hoose TCP client mode, Server IP write 10.10.100.254, it is the WIFI default
IP address, Server port to 8899, It is the default Port the WIFI module listen,
Click Connect to link to the module.
Now, you can test send data between RS232 and WIFI.
COM
COM
COM
COM port
port
port
port to
to
to
to WIFI:
WIFI:
WIFI:
WIFI: PC RS232 -> Module RS232 -> Module WIFI -> PC WIFI,
WIFI
WIFI
WIFI
WIFI to
to
to
to COM
COM
COM
COM port:
port:
port:
port: PC WIFI -> Module WIFI -> Module RS232 -> PC RS232.
Figure 4 serial / network parameter settings and transmission test
1.4 Application Examples
1.4.1
1.4.1
1.4.1
1.4.1 Wireless
Wireless
Wireless
Wireless remote
remote
remote
remote control
control
control
control applications
applications
applications
applications
USR - WIFI 232 Module
Figure 5 Wireless remote control applications
In the wireless remote control applications , USR-WIFI232 module works in AP

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mode. USR-WIFI232 module ’ s s erial connect user ’ s devices . Control client ( such as
smartphones ) can controll the user equipment via wireless network .
1.4.2
1.4.2
1.4.2
1.4.2 Remote
Remote
Remote
Remote connectivity
connectivity
connectivity
connectivity applications
applications
applications
applications
USR - WIFI 232 Module
USR - WIFI 232 Module
Internet
LAN
WAN
Figure 6 Remote connectivity applications
I n r emote connection applications , USR-WIFI232 module works in the STA mode,
connect to i nternet through i nternet gateway . Module is set to TCP Client, connected to
the i nternet TCP server. User devices connected to USR-WIFI232 module through the
serial port .
This application can collect data from the user device and send it to the server for
processing and storage , the i nternet server can also send commands to control the
user device for control . Users can use smartphone or PC to control the user device via
LAN, and also can control the user device via WAN by communicate to internet server.
1.4.3
1.4.3
1.4.3
1.4.3 Transparent
Transparent
Transparent
Transparent T
T
T
T ransmission
ransmission
ransmission
ransmission
In t his application, two USR-WIFI232 module s connecet by Wi-Fi as shown below,
this application is to build a transparent serial channel between two user devices .
The following figure is set as follows :
L eft of the USR-WIFI232 module is set to AP mode , SSID and IP address are
default , network protocol is set to TCP / Server mode , protocol port is 8899 by
defaults .
R ight of the USR-WIFI232 module is set to STA mode , SSID is set to the AP's
SSID which will be connected to ( eg USR-WIFI232-T), the IP address is DHCP
by default, network protocol is set to TCP / Client mode , protocol port 8899 ,
Target IP address is set to the left of the module , i.e. 10.10.100.254.
When the right side module startup will find AP (SSID: USR-WIFI232-T), and then
automatically connect to the left side TCP server as client. All connections can
compelet automatically, both sides of the UART can transparently transmit data.

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USR - WIFI 232 Module
USR - WIFI 232 Module
Figure 7 Transparent serial

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2
2
2
2、
、
、
、Product
Product
Product
Product Overview
Overview
Overview
Overview
2.1 General Description
USR-WIFI232-S/T/G2 /H is a fully self-contained small form-factor, single stream,
802.11b/g/n Wi-Fi module, which provide a wireless interface to any equipment with a
Serial interface for data transfer.
USR-WIFI232-S/T/G2 /H integrate MAC, baseband processor, RF transceiver with
power amplifier in hardware and all Wi-Fi protocol and configuration functionality and
networking stack, in embedded firmware to make a fully self-contained 802.11b/g/n
Wi-Fi solution for a variety of applications.
USR-WIFI232-S/T/G2 /H adopts the world's lowest power consumption embedded
architecture. It has been optimized for all kinds of client applications in the home
automation, smart grid, handheld device, personal medical application and industrial
control that have lower data rates, and transmit or receive basis data at low rate .
USR-WIFI232-S/T/G2 /H integrates all Wi-Fi functionality into a low-profile, small
module package that can be easily mounted on main PCB with application specific
circuits. Also, module provides built-in antenna, external antenna option. T he following
is the size of module.
USR-WIFI232-S 22mm x 13.5mm x 2.3mm , SMT Footprint
USR-WIFI232-T 22mm x 13.5mm x 6mm , 1x10 2mm Connector
USR-WIFI232-G2 23.1mm x 32.8mm x 2.7mm , SMT Footprint
USR-WIFI232- H 23.1mm x 32.8mm x 2.7mm , SMT Footprint
2.2 Device Features
Support IEEE802.11b/g/n Wireless Standards
Support W[email protected] GHz, support WEP, WPA/WPA2 security mode.
Based on Self-developed High Performance MCU
Ultra-Low-Power for Battery Applications with Excellent Power Save Scheme
Support UART/PWM/GPIO Data Communication Interface
Support Work As STA/AP Mode
Support SmartLink Function (APP program provide)
Support N etwork C onfiguration by Audio. (USR-WIFI232-H)
Support usrlink Function (Fast set SSID)
Support Wireless Upgrade Function
Support WPS Function
Support Multi-TCP Link (5 Channel) Apllication
Support Internal/External(I-PEX/SMA) Antenna Option
Single +3.3V Power Supply
Smallest Size
FCC/CE Certificated

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2.3 Device Paremeters
Table 1 USR-WIFI232-S/T/G2 Module Technical Specifications
Class
Class
Class
Class Item
Item
Item
Item Parameters
Parameters
Parameters
Parameters
Wireless
Wireless
Wireless
Wireless
Parameters
Parameters
Parameters
Parameters
Certification FCC / CE
Wireless
standard
802.11 b/g/n
Frequency range 2.412GHz-2.484GHz
Transmit Power
802.11b: +16 +/-2dBm (@11Mbps)
802.11g: +14 +/-2dBm (@54Mbps)
802.11n: +13 +/-2dBm (@HT20, MCS7)
Receiver
Sensitivity
802.11b: -93 dBm (@11Mbps ,CCK)
802.11g: -85 dBm (@54Mbps, OFDM)
802.11n: -82 dBm (@HT20, MCS7)
Antenna Option
External ：I-PEX connector （WIFI232-T/G2 /H ）
SMA connector （WIFI232-S ）
Internal ：On-board PCB antenna
（WIFI232-S/G2 /H ）
Hardware
Hardware
Hardware
Hardware
Parameters
Parameters
Parameters
Parameters
Data Interface
UART
PWM/GPIO ( Except WIFI232-H)
SPI (Reserved)
(Reserved)
(Reserved)
(Reserved)
Operating
Voltage
3.0~3.6V
Operating
Current
Peak [Continuous TX]: ~200mA
Average. ~12mA, Peak: 200mA
Standby [WiFi Shutdown]: <200uA (Reserved)
(Reserved)
(Reserved)
(Reserved)
Operating Temp.
-40 ℃- 85 ℃
Storage Temp.
-45 ℃- 125 ℃
Dimensions and
Size
22mm x 13.5mm x 2.3mm （WIFI232-S ）
22mm x 13.5mm x 6mm （WIFI232-T ）
23.1mm x 32.8mm x 2.7mm （WIFI232-G2 /H ）
Footprint
1x10 , 2mm connector （WIFI232-T ）
SMT （WIFI232-S/G2 /H ）
Software
Software
Software
Software
Parameters
Parameters
Parameters
Parameters
Network Type STA/AP/STA+AP
Security
Mechanisms
WEP/WP A -PSK/WPA2-PSK
Encryption WEP64/WEP128/TKIP/AES
Update Firmware Local Wireless
Customization Web Page Upgrade
Network Protocol IPv4, TCP/UDP/HTTP
User
Configuration
AT+ command
Website ( except WIFI232-S )

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Android/iOS APP,
Smart Link APP tools
2.4 Modules feature comparison
Listed below are the basic functions of USR-WIFI232 low-power series:
Table 2 USR-WIFI232-S/T/G2Modules feature comparison
Feature USR-WIFI232-S USR-
WIFI23
2-T
USR-WIFI232-G2 USR-WIFI232-H
-Sa -Sb -G2a -G2b -Ha -Hb
WIFI AP √ √ √ √ √ √ √
STA √ √ √ √ √ √ √
Socket SocketA √ √ √ √ √ √ √
SocketB √ √ √ √ √ √ √
UART-WIFI
Transparent
transmission
√ √ √ √ √ √ √
Embedded Web No No √ √ √ √ √
AT+command √ √ √ √ √ √ √
UART hardware
flow control
√ √ No √ √ √ √
Smartlink √ √ √ √ √ No No
Audio N etwork
C onfiguration
No No No No No √ √
WPS √ √ √ √ √ No No
PWM No No 3 4 4 2 No
GPIO 1 1 3 6 6 11 No
Antenna Option
On-boar
d PCB
antenna
SMA
connecto
r
I-PEX
connect
or
On-boar
d PCB
antenna
I-PEX
connector
On-board
PCB
antenna
I-PEX
conne
ctor
Note
Note
Note
Note ：
WIFI232-T/G2 ’ s PWM/GPIO pin is multiplexed pin .
2.5 Key Application
Remote equipment monitoring
Industrial sensors and controls
Asset tracking and telemetry
Home automation
Medical devices

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2.6 Package Information
2.6.1
2.6.1
2.6.1
2.6.1 Recommended
Recommended
Recommended
Recommended Reflow
Reflow
Reflow
Reflow Profile
Profile
Profile
Profile
Figure 8 Reflow Soldering Profile
Table 3 Reflow Soldering Parameter
Note:
Note:
Note:
Note:
1. Recommend to supply N2 for reflow oven.
2. N2 atmosphere during reflow (O2<300ppm).
2.6.2
2.6.2
2.6.2
2.6.2 Device
Device
Device
Device Handling
Handling
Handling
Handling Instruction
Instruction
Instruction
Instruction (Module
(Module
(Module
(Module IC
IC
IC
IC SMT
SMT
SMT
SMT Preparation)
Preparation)
Preparation)
Preparation)
Shelf life in sealed bag: 12 months, at <30 ℃and <60% relative humidity
(RH)
After bag is opened, devices that will be re-baked required after last baked
with window time 168 hours.
R ecommend to oven bake with N2 supplied.
Baked required with 24 hours at 125 ±5℃before rework process for two
modules, one is new module and two is board with module.
Recommend to store at ≦10% RH with vacuum packing.
If SMT process needs twice reflow:
(1) Top side SMT and reflow (2) Bottom side SMT and reflow
Case 1: Wifi module mounted on top side. Need to bake when bottom side
process over 168 hours window time, no need to bake within 168
hours.
Case 2: Wifi module mounted on bottom side, follow normal bake rule
before process.
Note:
Note:
Note:
Note:
Window time means from last bake end to next reflow start that has 168
hours space.
NO.
NO.
NO.
NO. Item
Item
Item
Item Temperature
Temperature
Temperature
Temperature (Degree)
(Degree)
(Degree)
(Degree)
Time(Sec)
Time(Sec)
Time(Sec)
Time(Sec)
1 Reflow Time
Time of above 220 ℃
35~55 sec
2 Peak-Temp
260 ℃max

USR-WIFI232-S/T/G2 /H Low Power WiFi Module User Manual http://en.usr.cn
Jinan USR IOT Technology Limited [email protected]nPage 15 of 87
2.6.3
2.6.3
2.6.3
2.6.3 Shipping
Shipping
Shipping
Shipping Information
Information
Information
Information
Figure 9 Shipping Information
TRAY
TRAY
TRAY
TRAY Size: 420*245*34 mm
Note:
Note:
Note:
Note:
1 tray = 5*20 pcs = 100 pcs
1 box = 2 trays = 2*100 pcs = 200pcs
1 carton = 4 boxes = 4*200 pcs = 800pcs

USR-WIFI232-S/T/G2 /H Low Power WiFi Module User Manual http://en.usr.cn
Jinan USR IOT Technology Limited [email protected]nPage 16 of 87
3
3
3
3、
、
、
、Hardware
Hardware
Hardware
Hardware Introduction
Introduction
Introduction
Introduction
3.1 Pins Definition
3.1.1.
3.1.1.
3.1.1.
3.1.1. USR-WIFI232-S
USR-WIFI232-S
USR-WIFI232-S
USR-WIFI232-S Pins
Pins
Pins
Pins Definition
Definition
Definition
Definition
Figure 10 USR-WIFI232-S View
Figure 11 USR-WIFI232-S Pins Map
Table 4 USR-WIFI232-S Pins Definition
Pin
Pin
Pin
Pin Describtion
Describtion
Describtion
Describtion Net
Net
Net
Net Name
Name
Name
Name Signal
Signal
Signal
Signal
Type
Type
Type
Type
Comments
Comments
Comments
Comments
1 SPI Data Out SPI_MOSI 0
SPI Interface （R
R
R
R eserved
eserved
eserved
eserved )
2 SPI Clock SPI_CLK I/O
3 SPI Data Out SPI_MISO I
4 SPI CS SPI_CS I/O
5 UART0 UART0_TX O UART Interface
6 UART0 UART0_RX I
7 UART0 UART0_CTS I/O
8 UART0 UART0_RTS I/O
9 GPIO GPIO I/O
GPIO23 ，No connect if not use
10 Module Reset nReset I Low effective reset input. Pull-up
if not use.
11 Module Boot Up nReady O 0 – Boot-up OK ;

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Jinan USR IOT Technology Limited [email protected]nPage 17 of 87
Indicator 1 – Boot-up No OK;
No connect if not use.
12 Module R ecover y nReload I Low effective reset input. Pull-up
if not use.
Can be set to Smart Link Pin
13 Wi-Fi Status nLink O 0- Wi-Fi Link .
1 - No WIFI Link .
No connect if not use.
14 WPS WPS I WPS Function Pin.
Pull-up if not use.
15 +3.3V Power DVDD Power
16 Ground GND Power
17 2.4GHz antenna
PAD
ANT_2.4G O Must be 50ohm impedance
<
<
<
< Explanation
Explanation
Explanation
Explanation >
>
>
> :
:
:
:
I — IN ; O — OUT ; PU — PULL-UP ; I/O — IN/OUT GPIO ;
<
<
<
< The
The
The
The main
main
main
main pin
pin
pin
pin function
function
function
function description
description
description
description >
>
>
>
nReset
nReset
nReset
nReset :
:
:
:
Module r eset pin, input GPIO, l ow effective .
Module nReset need pull-up when module works . If MCU module needs to do a reset
operation , pull low for at least 10ms and then pull up .
nReload
nReload
nReload
nReload :
:
:
:
Module recover factory settings pin, input GPIO, l ow effective .
1) After module is powered up, short press this button ( Low < 3s ) to make the module
go into “ Smart Link ” config mode, waiting for APP to set password and other
information.
2) After module is powered up, long press this button ( Low > 3s ) to make the module
recover to factory setting.
Note ：
1. When designing the circuit, please use the stable connection, such as l ight t ouch
s witches, and increase the appropriate filter circuit, or module can't restore factory
s ettings stabl y.
2.n Reset and nReload need 5 kohm ~ 10 kohm pull-up resistor
nLink
nLink
nLink
nLink :
:
:
:
Wi-Fi link status indicator pin, output GPIO , l ow effective. USR strongly suggest customer
connect out this pin to LED.
1) At “ Smart Link ” config mode, this LED used to indicate APP to finish setting.
2) At normal mode, it ’ s Wi-Fi link status indicator
nReady
nReady
nReady
nReady :
:
:
:
Module startup success indicator pin, output GPIO , l ow effective. C an be connected out to
led.
WPS
WPS
WPS
WPS :
:
:
:
WPS function start pin, input GPIO, low effective. C an be connected to key.
UART0_TX/RX/CTS/RTS
UART0_TX/RX/CTS/RTS
UART0_TX/RX/CTS/RTS
UART0_TX/RX/CTS/RTS :
:
:
:

USR-WIFI232-S/T/G2 /H Low Power WiFi Module User Manual http://en.usr.cn
Jinan USR IOT Technology Limited [email protected]nPage 18 of 87
UART pin
GPIO
GPIO
GPIO
GPIO n:
n:
n:
n:
GPIO which can be controlled by network cammands , n is control index number.
3.1.2.
3.1.2.
3.1.2.
3.1.2. USR-WIFI232-T
USR-WIFI232-T
USR-WIFI232-T
USR-WIFI232-T Pins
Pins
Pins
Pins Definition
Definition
Definition
Definition
Figure 12 USR-WIFI232-T view
Figure 13 USR-WIFI232-T pin map
Table 5 USR-WIFI232-T Pins Definition
Pin
Pin
Pin
Pin Describtion
Describtion
Describtion
Describtion Net
Net
Net
Net Name
Name
Name
Name Signal
Signal
Signal
Signal Type
Type
Type
Type Comments
Comments
Comments
Comments
1 Ground GND Power
2 +3.3V Power DVDD Power 3.3V@250mA
3 Module R ecover y nReload I Low effective reset input.
Pull-up if not use.
Can be set to Smart Link Pin
4 Module Reset nReset I Low effective reset input.
Pull-up if not use.
5 UART UART_RX I No connect if not use.
6 UART UART_TX O No connect if not use.
7 Power soft
switch
PWR_SW I,PU “ 0 ” – Power Down Mode
“ 1 ” – Normal mode
(Function
(Function
(Function
(Function is
is
is
is reserved)
reserved)
reserved)
reserved)
8 PWM/WPS PWM_3 I/O Default WPS function,
Can be set to PWM/GPIO18.
No connect if not use.
9 PWM/nReady PWM_2 I/O Default nReady function,
Can be set to PWM/GPIO12.

USR-WIFI232-S/T/G2 /H Low Power WiFi Module User Manual http://en.usr.cn
Jinan USR IOT Technology Limited [email protected]nPage 19 of 87
No connect if not use.
10 PWM/nLink PWM_1 I/O Default nLink function,
Can be set to PWM/GPIO11.
No connect if not use.
<
<
<
< Explanation
Explanation
Explanation
Explanation >
>
>
> :
:
:
:
I — IN ; O — OUT ; PU — PULL-UP ; I/O — IN/OUT GPIO ;
<
<
<
< The
The
The
The main
main
main
main pin
pin
pin
pin function
function
function
function description
description
description
description >
>
>
>
nReset
nReset
nReset
nReset :
:
:
:
Module r eset pin, input GPIO, l ow effective .
Module nReset need pull-up when module works . If MCU module needs to do a reset
operation , pull low for at least 10ms and then pull up .
nReload
nReload
nReload
nReload :
:
:
:
Module recover y factory settings pin, input GPIO, l ow effective .
1) After module is powered up, short press this button ( Low < 3s ) to make the module
go into “ Smart Link ” config mode, waiting for APP to set password and other
information.
2) After module is powered up, long press this button (Low > 3s) to make the module
recover to factory setting.
Note ：
1. When designing the circuit, please use the stable connection, such as l ight t ouch
s witches, and increase the appropriate filter circuit, or module can't restore factory
s ettings stabl y.
2.n Reset and nReload need 5 kohm ~ 10 kohm pull-up resistor
nLink
nLink
nLink
nLink :
:
:
:
Wi-Fi link status indicator pin, output GPIO , l ow effective. USR strongly suggest customer
connect out this pin to LED.
1) At “ Smart Link ” config mode, this LED used to indicate APP to finish setting.
2) At normal mode, it ’ s Wi-Fi link status indicator .
nReady
nReady
nReady
nReady :
:
:
:
Module startup success indicator pin, output GPIO , l ow effective. C an be connected out to
led.
WPS
WPS
WPS
WPS :
:
:
:
WPS function start pin, input GPIO, low effective. C an be connected to key.
UART0_TX/RX/CTS/RTS
UART0_TX/RX/CTS/RTS
UART0_TX/RX/CTS/RTS
UART0_TX/RX/CTS/RTS ：
UART pin
GPIO
GPIO
GPIO
GPIO n:
n:
n:
n:
GPIO which can be controlled by network c o mmands , n is control index number.
PWM_N
PWM_N
PWM_N
PWM_N :
:
:
:
Module PWM signal output pin . Can also be configured as GPIO pin . Can switch
PWM_1 function to nLink, PWM_2 function to nReady, PWM_3 function to WPS keys ,
by AT command "AT + LPTIO = on" . "AT + LPTIO = off" is the opposite.

USR-WIFI232-S/T/G2 /H Low Power WiFi Module User Manual http://en.usr.cn
Jinan USR IOT Technology Limited [email protected]nPage 20 of 87
3.1.3.
3.1.3.
3.1.3.
3.1.3. USR-WIFI232-G2
USR-WIFI232-G2
USR-WIFI232-G2
USR-WIFI232-G2 Pins
Pins
Pins
Pins Definition
Definition
Definition
Definition
Figure 14 USR-WIFI232-G2 view
Figure 15 USR-WIFI232-G2 Pin map
Table 6 USR-WIFI232-G2 pin Definition
Pin
Pin
Pin
Pin Describtion
Describtion
Describtion
Describtion Net
Net
Net
Net Name
Name
Name
Name Signal
Signal
Signal
Signal
Type
Type
Type
Type
Comments
Comments
Comments
Comments
1,17,32,48 Ground GND Power
2 Debug SWCLK I, PD
Debug functional pin,
No connect if not use.3 N.C
4 N.C