Jinan USR IOT Technology WIFI232-A User manual

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USR-WIFI232-
USR-WIFI232-
USR-WIFI232-
USR-WIFI232- A/B/C
A/B/C
A/B/C
A/B/C
Embedded
Embedded
Embedded
Embedded WiFi
WiFi
WiFi
WiFi Module
Module
Module
Module User
User
User
User Manual
Manual
Manual
Manual
Version ：V5.0.8
Remarks: This module is applicable to USR-WIFI232-A/B/C and its derivatives, for example USR-
WIFI232-2/6 1 0 . For USR-WIFI232-G/T /S , please refer to the corresponding document.
Note: this article is based on the firmware version for V5.01.01 and above version of the module,
if the version is lower than this version, some function is not supported.

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Table
Table
Table
Table Of
Of
Of
Of Contents
Contents
Contents
Contents
1 Quick Start .................................................................................................................................................. 7
1.1 Hardware connect .......................................................................................................................... 7
1.2 Network connection ........................................................................................................................ 7
1.3 communication test ........................................................................................................................ 9
2 Product Overview ...................................................................................................................................... 9
2.1 General Description ..................................................................................................................... 10
2.2 Device Features ........................................................................................................................... 10
2.3 Device Paremeters ....................................................................................................................... 11
2.4 Key Application ............................................................................................................................. 11
2.5 Package Information .................................................................................................................... 12
2.5.1 Recommended Reflow Profile ........................................................................................ 12
2.5.2 Device Handling Instruction (Module IC SMT Preparation) ........................................ 12
2.5.3 Shipping Information ......................................................................................................... 13
3 Hardware Introduction ............................................................................................................................ 13
3.1 Pins Definition ............................................................................................................................... 13
3.1.1 USR-WIFI232-A/B Pins Definition .................................................................................. 13
3.1.2 USR-WIFI232-Ca/Cb Pins Definition ............................................................................. 15
3.2 Mechanical Size ........................................................................................................................... 16
3.2.1 USR-WIFI232-A/B ............................................................................................................. 16
3.2.2 USR-WIFI232-Ca/Cb ........................................................................................................ 17
3.3 Antenna .......................................................................................................................................... 18
3.3.1 On-board Chip Antenna ................................................................................................... 18
3.3.2 External Antenna ............................................................................................................... 18
3.4 Evaluation Kit ................................................................................................................................ 19
3.5 Hardware Reference Design ...................................................................................................... 21
3.5.1 Hardware Typical Application .......................................................................................... 21
3.5.2 10/100M Ethernet Interface ............................................................................................. 22
3.5.2.1 Ethernet Connection with Transformer ............................................................... 22
3.5.2.2 Ethernet Connection without Transformer ......................................................... 23
3.5.3 UART Interface .................................................................................................................. 25
3.5.4 Power Interface ................................................................................................................. 25
4 Modules Function Description ............................................................................................................... 25
4.1 User configuration process ......................................................................................................... 26
4.2 Working mode ............................................................................................................................... 26
4.2.1 Transparent Mode ............................................................................................................. 26
4.2.2 Serial command mode ..................................................................................................... 27
4.2.3 GPIO mode ........................................................................................................................ 28
4.2.4 HTTPD Client mode ......................................................................................................... 28
4.3 Wireless Networking .................................................................................................................... 29
4.3.1 STA ...................................................................................................................................... 30
4.3.2 AP ........................................................................................................................................ 30
4.3.3 AP+STA .............................................................................................................................. 31
4.4 Ethernet Interface Communication ............................................................................................ 32

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4.4.1 USR-WIFI232-A/B/C Ethernet Interface Networking (As AP) .................................... 32
4.4.2 USR-WIFI232-A/B/C Ethernet Interface Networking (As STA, N-Ver) ...................... 33
4.4.3 USR-WIFI232-A/B/C Ethernet Interface Networking (As STA, Z-Ver) ...................... 34
4.5 WI-FI parameter setting ............................................................................................................... 34
4.5.1 Auto- Frequency Function ............................................................................................... 34
4.5.2 Security ............................................................................................................................... 34
4.5.3 Search Function for STA .................................................................................................. 35
4.5.4 Address Binding ................................................................................................................ 35
4.6 UART Frame Scheme ................................................................................................................. 35
4.6.1 UART Free-Frame ............................................................................................................ 35
4.6.2 UART Auto-Frame ............................................................................................................ 36
4.7 Network Setting ............................................................................................................................ 36
4.7.1 Socket A ............................................................................................................................. 36
4.7.2 Socket B ............................................................................................................................. 37
4.8 New function ................................................................................................................................. 37
4.8.1 TCP password authentication ......................................................................................... 37
4.8.2 Registered Package ID/MAC .......................................................................................... 37
4.8.3 Self-adaption Baudrate .................................................................................................... 38
4.8.4 WEB IO ............................................................................................................................... 38
4.8.5 Keepalive ............................................................................................................................ 38
4.8.6 Multiple STA parameters .................................................................................................. 38
4.8.7 Websocket ......................................................................................................................... 39
4.8.8 Fast access Wi-Fi(usr-link) .............................................................................................. 39
4.9 Palmodic Signal ............................................................................................................................ 41
4.10 Parameters Configuration ......................................................................................................... 41
4.11 Firmware Upgrade ..................................................................................................................... 42
5 Web Accessing and AT+instruction set ................................................................................................ 43
5.1 Configuration via Web Accessing .............................................................................................. 43
5.1.1 Open Web Management Interface ................................................................................. 43
5.1.2 Quick Configure ................................................................................................................ 44
5.1.3 Mode Selection Page ....................................................................................................... 44
5.1.4 AP Interface Setting Page ................................................................................................ 45
5.1.5 STA Interface Setting Page ............................................................................................. 45
5.1.6 Application Setting Page .................................................................................................. 46
5.1.7 Ethernet Setting ................................................................................................................ 47
5.1.8 HTTPD Client Mode ......................................................................................................... 48
5.1.9 WEB IO ............................................................................................................................... 48
5.1.10 Advanced Page ............................................................................................................... 49
5.1.11 Device Management Page ............................................................................................ 49
5.2 AT+instruction Introduction ......................................................................................................... 50
5.2.1 Configuration Mode .......................................................................................................... 50
5.2.1.1 Switch to Configuration Mode .............................................................................. 51
5.2.2 AT+ Instruction Set Overview .......................................................................................... 51
5.2.2.1 Instruction Syntax Format .................................................................................... 53

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5.2.2.2 AT+ Instruction Set ................................................................................................ 54
5.2.2.2.1 AT+E ............................................................................................................. 56
5.2.2.2.2 AT+ENTM .................................................................................................... 56
5.2.2.2.3 AT+NETP ..................................................................................................... 56
5.2.2.2.4 AT+UART ..................................................................................................... 57
5.2.2.2.5 AT+UARTF .................................................................................................. 57
5.2.2.2.6 AT+UARTFT ................................................................................................ 57
5.2.2.2.7 AT+UARTFL ................................................................................................ 58
5.2.2.2.8 AT+TMODE ................................................................................................. 58
5.2.2.2.9 AT+WMODE ................................................................................................ 58
5.2.2.2.10 AT+WSKEY ............................................................................................... 59
5.2.2.2.11 AT+WSSSID .............................................................................................. 59
5.2.2.2.12 AT+ WSLK ................................................................................................. 59
5.2.2.2.13 AT+WEBU ................................................................................................. 60
5.2.2.2.14 AT+WAP .................................................................................................... 60
5.2.2.2.15 AT+WAKEY ............................................................................................... 61
5.2.2.2.16 AT+HIDESSID ........................................................................................... 61
5.2.2.2.17 AT+MSLP ................................................................................................... 62
5.2.2.2.18 AT+WSCAN ............................................................................................... 62
5.2.2.2.19 AT+ TCPLK ................................................................................................ 62
5.2.2.2.20 AT + TCPDIS ............................................................................................. 62
5.2.2.2.21 AT+ WANN ................................................................................................ 63
5.2.2.2.22 AT+ LANN .................................................................................................. 63
5.2.2.2.23 AT+DHCPDEN .......................................................................................... 64
5.2.2.2.24 AT+ DHCPGW .......................................................................................... 64
5.2.2.2.25 AT+ TCPTO ............................................................................................... 64
5.2.2.2.26 AT+ MAXSK .............................................................................................. 65
5.2.2.2.27 AT+TCPB ................................................................................................... 65
5.2.2.2.28 AT+TCPPTB .............................................................................................. 65
5.2.2.2.29 AT+TCPADDB ........................................................................................... 66
5.2.2.2.30 AT+TCPTOB ............................................................................................. 66
5.2.2.2.31 AT+TCPLKB .............................................................................................. 66
5.2.2.2.32 AT+EPHY ................................................................................................... 66
5.2.2.2.33 AT+STTC ................................................................................................... 67
5.2.2.2.34 AT+DOMAIN ............................................................................................. 67
5.2.2.2.35 AT+FUDLX ................................................................................................ 67
5.2.2.2.36 AT+MMID ................................................................................................... 68
5.2.2.2.37 AT+IDFIR ................................................................................................... 68
5.2.2.2.38 AT+IDEVE ................................................................................................. 68
5.2.2.2.39 AT+AABR ................................................................................................... 69
5.2.2.2.40 AT+RELD ................................................................................................... 69
5.2.2.2.41 AT+Z ........................................................................................................... 69
5.2.2.2.42 AT+MID ...................................................................................................... 69
5.2.2.2.43 AT+VER ..................................................................................................... 69

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5.2.2.2.44 AT+H .......................................................................................................... 69
5.2.2.2.45 AT+ HTTPURL .......................................................................................... 70
5.2.2.2.46 AT+ HTTPTP ............................................................................................. 70
5.2.2.2.47 AT+ HTTPPH ............................................................................................ 70
5.2.2.2.48 AT+ HTTPCN ............................................................................................ 70
5.2.2.2.49 AT+ HTTPUA ............................................................................................ 71
5.2.2.2.50 AT+WSSSIDA ........................................................................................... 71
5.2.2.2.51 AT+WSSSIDB ........................................................................................... 71
5.2.2.2.52 AT+WSSSIDC ........................................................................................... 72
5.2.2.2.53 AT+WSKEYA ............................................................................................. 72
5.2.2.2.54 AT+WSKEYB ............................................................................................ 72
5.2.2.2.55 AT+WSKEYC ............................................................................................ 73
5.2.2.2.56 AT+ WSQY ................................................................................................ 74
5.2.2.2.57 AT+ HTPMODE ........................................................................................ 74
5.2.2.2.58 AT+ HTPSV ............................................................................................... 74
5.2.2.2.59 AT+ HTPTP ............................................................................................... 74
5.2.2.2.60 AT+ HTPURL ............................................................................................ 75
5.2.2.2.61 AT+ HTPHEAD ......................................................................................... 75
5.2.2.2.62 AT+ REGEN .............................................................................................. 75
5.2.2.2.63 AT+ REGTCP ............................................................................................ 76
5.2.2.2.64 AT+ REGID ................................................................................................ 76
6 USR-WIFI232-A/B/C Usage Introduction ............................................................................................. 76
6.1 Module Debug .............................................................................................................................. 76
6.1.1 Software Debug Tools ...................................................................................................... 76
6.1.2 Network Connection ......................................................................................................... 77
6.1.3 Debug ................................................................................................................................. 77
6.2 Use Cases ..................................................................................................................................... 79
6.2.1 Wireless Control Application ........................................................................................... 79
6.2.2 Remote Management Application .................................................................................. 80
6.2.3 Transparent Serial Port Application ................................................................................ 80
6.2.4 Wireless Data Acquisition Card Application .................................................................. 81
Appendix A: Questions and Answers ....................................................................................................... 83
Q1: How to configure transparent serial port application (TCP protocol) with two WIFI
modules? .............................................................................................................................................. 83
Q2: Where to Set WIFI Module LAN IP and WAN IP through Web Page ？.............................. 84
Q3: How to configure transparent serial port application (UDP protocol) with two WIFI
modules? .............................................................................................................................................. 84
Q4: Where to set USR-WIFI232-A/B/C module network protocol (TCP/UDP)? ....................... 85
Q5: How to configure transparent serial port application: Two WIFI modules all configured as
STA and connection through AP? ..................................................................................................... 86
Q6: How to avoid IP address confliction when apply USR-WIFI232-A/B/C module? .............. 87
Q7: PC works as server, all WIFI modules works as data acquisition card and connect with
PC, how to configure this application? ............................................................................................ 87
Q8: WIFI module support UDP multicast? ...................................................................................... 88

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Q9:WIFI module operates in STA mode, the PC how to get the IP module? ............................ 88
Appendix b: evb reference design ............................................................................................................ 90
Appendix c: external power shutdown mode reference design ........................................................... 91
Appendix e: Contact Information .............................................................................................................. 92
Appendix f: Disclaimer ............................................................................................................................... 92
Appendix g: History .................................................................................................................................... 93

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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.
If there are problems in using the process, you can refer to the official website of our application
case:
http://www.usriot.com/Faq/cat-47.html
http://www.usriot.com/Faq/cat-47.html
http://www.usriot.com/Faq/cat-47.html
http://www.usriot.com/Faq/cat-47.html
We can also submit the issue to our customer support center:
http://h.usriot.com
http://h.usriot.com
http://h.usriot.com
http://h.usriot.com
1.1
1.1
1.1
1.1 Hardware
Hardware
Hardware
Hardware connect
connect
connect
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.
Figure 1 hardware
hardware
hardware
hardware connection
connection
connection
connection diagram
diagram
diagram
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-A/B/C evaluation
board for users to choose.

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1.2
1.2
1.2
1.2 Network
Network
Network
Network connection
connection
connection
connection
The following is the USR-WIFI232- A module example ,Other modules are the same. Open Wi-Fi,
search network, as shown in below, USR-WIFI232-A/B _3378(A/B determined according to the
specific type of module, XXXX is the MAC address after the four) is the default network name
(SSID) of the module.
Figure 2 WIFI
WIFI
WIFI
WIFI Search
Search
Search
Search
Join the network, choose to automatically obtain IP, WIFI module supports DHCP Server feature
and is enabled by default.

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Figure 3 WIFI
WIFI
WIFI
WIFI connection
connection
connection
connection
Now, n link led of USR-WIFI232- A Evaluation Board is lighting.
1.3
1.3
1.3
1.3 communication
communication
communication
communication test
test
test
test
Module ’s default setting:
SSID:
SSID:
SSID:
SSID: USR-WIFI232-A;

Encryption
Encryption
Encryption
Encryption mode
mode
mode
mode :
:
:
:open ，none ;
UART:
UART:
UART:
UART: 57600 ,8,1,None ;

Network
Network
Network
Network parameters
parameters
parameters
parameters ：TCP,Server,8899,10.10.100.254 ;
IP:
IP:
IP:
IP: 10.10.100.254;
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 57600 , 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 port to WIFI: PC RS232 -> Module RS232 -> Module WIFI -> PC WIFI .
WIFI to COM port: PC WIFI -> Module WIFI -> Module RS232 -> PC RS232.
Figure 4 serial
serial
serial
serial /
/
/
/ network
network
network
network transmission
transmission
transmission
transmission test
test
test
test

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2
2
2
2 Product
Product
Product
Product Overview
Overview
Overview
Overview
2.1
2.1
2.1
2.1 General
General
General
General Description
Description
Description
Description
USR-WIFI232-A/B/C module is an integration of 802.11 b/g/n wi-fi module,which provide a
wireless interface to any equipment with a Serial interface for data transfer.
The module used to MAC, baseband chip, RF transceiver unit, as well as the power
amplifier;Embedded firmware support wi-fi protocols and configuration, as well as the network
TCP/IP protocol stack.
USR-WIFI232-A/B/C uses the industry's highest performance embedded industrial structure, and
for the application of smart furniture, smart grid, handheld devices, personal medical, industrial
control, etc. These data fields, do a professional optimization.
USR-WIFI232-A/B/C as a hot spot can accommodate 32 clients simultaneously wi - fi access, but
also can accommodate 32 TCP client, specific models and parameters of the series modules are
as follows:
USR-WIFI232-A 40mm x 25mm ，2x7 2mm Connector ，Built-in antenna
USR-WIFI232-B 40mm x 25mm ，2x7 2mm Connector ，I-PEX connector
USR-WIFI232-Ca 40mm x 25mm ，SMT Footprint ，Built-in antenna
USR-WIFI232-Cb 40mm x 25mm ，SMT Footprint ，I-PEX connector
2.2
2.2
2.2
2.2 Device
Device
Device
Device Features
Features
Features
Features



Support
Support
Support
Support IEEE802.11b/g/n
IEEE802.11b/g/n
IEEE802.11b/g/n
IEEE802.11b/g/n Wireless
Wireless
Wireless
Wireless Standards
Standards
Standards
Standards



Support
Support
Support
Support TCP/IP/UDP
TCP/IP/UDP
TCP/IP/UDP
TCP/IP/UDP Network
Network
Network
Network Protocols
Protocols
Protocols
Protocols



Support
Support
Support
Support UART/GPIO/Ethernet
UART/GPIO/Ethernet
UART/GPIO/Ethernet
UART/GPIO/Ethernet Data
Data
Data
Data Interface
Interface
Interface
Interface



Support
Support
Support
Support Work
Work
Work
Work As
As
As
As STA/AP
STA/AP
STA/AP
STA/AP /AP+STA
/AP+STA
/AP+STA
/AP+STA Mode
Mode
Mode
Mode



Support
Support
Support
Support Router/Bridge
Router/Bridge
Router/Bridge
Router/Bridge Mode
Mode
Mode
Mode Networking
Networking
Networking
Networking



Support
Support
Support
Support Internal/External
Internal/External
Internal/External
Internal/External Antenna
Antenna
Antenna
Antenna Option
Option
Option
Option



Support
Support
Support
Support Transparent
Transparent
Transparent
Transparent Transmission
Transmission
Transmission
Transmission Mode
Mode
Mode
Mode



Support
Support
Support
Support AT+
AT+
AT+
AT+ Instruction
Instruction
Instruction
Instruction Set
Set
Set
Set for
for
for
for Configuration
Configuration
Configuration
Configuration



Support
Support
Support
Support Friendly
Friendly
Friendly
Friendly Web
Web
Web
Web Configuration
Configuration
Configuration
Configuration Page
Page
Page
Page



Support
Support
Support
Support Palmodic
Palmodic
Palmodic
Palmodic Signal
Signal
Signal
Signal



Support
Support
Support
Support UART
UART
UART
UART Auto-Frame
Auto-Frame
Auto-Frame
Auto-Frame Function
Function
Function
Function



Single
Single
Single
Single +3.3V
+3.3V
+3.3V
+3.3V Power
Power
Power
Power Supply
Supply
Supply
Supply



Small
Small
Small
Small Size:
Size:
Size:
Size: 25
25
25
25 x
x
x
x 40mm
40mm
40mm
40mm

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


FCC/CE
FCC/CE
FCC/CE
FCC/CE Certificated
Certificated
Certificated
Certificated
2.3
2.3
2.3
2.3 Device
Device
Device
Device Paremeters
Paremeters
Paremeters
Paremeters
Table 1 USR-WIFI232-A/B/C 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: +20 dBm (Max.)
802.11g: +18 dBm (Max.)
802.11n: +15 dBm (Max.)
Configurable
Receiver Sensitivity
802.11b: -89 dBm
802.11g: -81dBm
802.11n: -71dBm
Antenna Option
External : I-PEX Connector
Internal :On-board chip antenna
Hardware
Hardware
Hardware
Hardware
Parameters
Parameters
Parameters
Parameters
Data Interface
UART: 300 bps - 4608 00bps
GPIOs
Ethernet: 100Mpbs
Operating Voltage 3.3V (+/-5%)
Operating Current 170mA~300mA
Operating
Temperature
- 40 ℃- 85 ℃
Storage Temperature
-4 0 ℃- 125 ℃
Dimensions and Size 25 × 40 × 8mm
Software
Software
Software
Software
Parameters
Parameters
Parameters
Parameters
Network Type Station /AP mode /STA+AP
Security Mechanisms WEP/WAP-PSK/WAP2-PSK
Encryption WEP64/WEP128/TKIP/AES
Work Mode Transparent Mode/Serial command
AT command AT+instruction set
Network Protocol
TCP/UDP/ARP/ICMP/DHCP/DNS/HT
TP
Max. TCP Connection 32
User Configuration
Web Server ＋AT command config.
2.4
2.4
2.4
2.4 Key
Key
Key
Key Application
Application
Application
Application

Remote equipment monitoring

Industrial sensors and controls

Asset tracking and telemetry

Home automation

Medical devices

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2.5
2.5
2.5
2.5 Package
Package
Package
Package Information
Information
Information
Information
2.5.1 Recommended Reflow Profile
Figure 5 Reflow
Reflow
Reflow
Reflow Soldering
Soldering
Soldering
Soldering Profile
Profile
Profile
Profile
Table 2 Reflow Soldering Parameter
Note:
Note:
Note:
Note:
1. Recommend to supply N2 for reflow oven.
2. N2 atmosphere during reflow (O2<300ppm).
2.5.2 Device Handling Instruction (Module IC SMT 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 à (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:
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

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2.5.3 Shipping Information
Figure 6 Shipping
Shipping
Shipping
Shipping Information
Information
Information
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
3
3
3
3 Hardware
Hardware
Hardware
Hardware Introduction
Introduction
Introduction
Introduction
3.1
3.1
3.1
3.1 Pins
Pins
Pins
Pins Definition
Definition
Definition
Definition
3.1.1 USR-WIFI232- A/B Pins Definition
Figure 7 USR-WIFI232-
USR-WIFI232-
USR-WIFI232-
USR-WIFI232- A/B
A/B
A/B
A/B

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PHY _ TX +
PHY _ RX +
nReady / GPIO 9
RESET
UART _ RTS / GPIO 5
UART _ TXD / GPIO 3
GND
PHY _ TX -
PHY _ RX -
nReload / GPIO 10
nLink / GPIO 8
UART _ CTS / GPIO 6
UART _ RXD / GPIO 4
3 . 3 V
Figure 8 USR-WIFI232-
USR-WIFI232-
USR-WIFI232-
USR-WIFI232- A/B
A/B
A/B
A/B Pins
Pins
Pins
Pins Map
Map
Map
Map
Table 3 USR-WIFI232- A/B Pins Definition
Pin
Pin
Pin
Pin Description
Description
Description
Description Name
Name
Name
Name Directi
Directi
Directi
Directi o
o
o
o
n
n
n
n
Note
Note
Note
Note
1
1
1
1Ground --GND GND Power G round
2
2
2
2VCC 3.3V@350mA 3.3V Power 3.3V @ 350mA power input
3
3
3
3UART Data Transmit UART_TXD O If not use UART function ,
this 4 pins can be configured
as GPIO pins, and can
change GPIO pin status
through AT command
GP IO GPIO3 I/O
4
4
4
4UART Data Receive UART_RXD I
GP IO GPIO4 I/O
5
5
5
5UART sends request
of data transmission
UART_RTS O
GP IO GPIO5 I/O
6
6
6
6UART receives data
transmission
permission
UART_CTS I
GP IO GPIO6 I/O
7
7
7
7Module reset signal RESET I “ Low ( 0 ) ” effective reset
input.
The reset duration should be
kept more than 300ms
8
8
8
8WiFi status Indication nLink O “ 0 ” - WIFI connection
available
“ 1 ” - No WIFI connection
Can be configured as GPIO.
GPIO GPIO8 I/O
9
9
9
9Indicate the module
status of power on
process
nReady O “ 0 ” or “ Palmodic Signal ” -
Finish module boot up
process;
“ 1 ” - Module boot up not
finish.
Can be configured as GPIO.
GPIO GPIO9 I/O
10
10
10
10 Restore configuration nReload I Module will Restore factory
default configuration after set
this pin “ 0 ” more than 1s,
then set “ 1 ” .
GPIO GPIO10 I/O
11
11
11
11 Ethernet Input+ PHY_RX+ I +1.8V Ethernet Data
Interface12
12
12
12 Ethernet Input- PHY_RX- I

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Support transformer and
direct connection (AC
couple) mode.
13
13
13
13 Ethernet Output+ PHY_TX+ O
14
14
14
14 Ethernet Output- PHY_TX- O
3.1.2 USR-WIFI232- Ca/Cb Pins Definition
Figure 9 USR-WIFI232-
USR-WIFI232-
USR-WIFI232-
USR-WIFI232- Ca/Cb
Ca/Cb
Ca/Cb
Ca/Cb
Figure 10 USR-WIFI232-
USR-WIFI232-
USR-WIFI232-
USR-WIFI232- Ca/Cb
Ca/Cb
Ca/Cb
Ca/Cb Pins
Pins
Pins
Pins Map
Map
Map
Map
Table 4 USR-WIFI232- Ca/Cb Pins Definition
Pin Description Name Directi
on
Note
3,18,19,
20,24,26
GND GND Power Ground
1, 2 VCC 3.3V Power 3.3V @ 350mA power
input
4 UART Data Transmit UART_TXD O If not use UART
function , this 4 pinsGPIO GPIO 3 I/O

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can be configured as
GPIO pins, and can
change GPIO pin
status through AT
command
5 UART Data Receive UART_RXD I
GPIO GPIO 4 I/O
6 UART sends request of
data transmission
UART_RTS O
GPIO GPIO 5 I/O
7 UART receives data
transmission permission
UART_CTS I
GPIO GPIO6 I/O
8 Ethernet output+ PHY_TX+ O +1.8V Ethernet Data
Interface(Module with
external 1.8V
reference voltage)
9 Ethernet output- PHY_TX- O
10 Ethernet In put+ PHY_RX+ I
11 Ethernet In put- PHY_RX- I
14 WiFi status Indication nlink O “ 0 ” - WIFI connection
available, “ 1 ” - No WIFI
connection .
15 Module reset signal nRST I
“ Low ( 0 ) ” effective
reset input.
The reset duration
should be kept more
than 300ms
16 Indicate the module
status of power on
process
nReady O
“ 0 ” - Finish module
boot up process;
“ 1 ” - Module boot up
not finish.
17 Restore configuration nReload I Module will Restore
factory default
configuration after set
this pin “ 0 ” more than
1s, then set “ 1 ” .
21 UART1 Data Receive NC NC
22 UART1 Data Transmit NC NC
23 Output 1.8V 1.8V O 1.8V@300mA, to the
Eth application
25 2.4GHz Antenna ANT O 50ohm impedance
control line
12,13 Retain NC NC
3.2
3.2
3.2
3.2 Mechanical
Mechanical
Mechanical
Mechanical Size
Size
Size
Size
USR-WIFI232-A/B/C modules physical size (25x40mm) as follows:
3.2.1 USR-WIFI232-A/B
USR-WIFI232- A/B module Mechanical Size:

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Figure 11 USR-WIFI232-
USR-WIFI232-
USR-WIFI232-
USR-WIFI232- A/B
A/B
A/B
A/B Mechanical
Mechanical
Mechanical
Mechanical Size
Size
Size
Size
3.2.2 USR-WIFI232-Ca/Cb
USR-WIFI232-Ca/Cb module Mechanical Dimension:
Figure 12 USR-WIFI232-
USR-WIFI232-
USR-WIFI232-
USR-WIFI232- Ca/Cb
Ca/Cb
Ca/Cb
Ca/Cb Mechanical
Mechanical
Mechanical
Mechanical Dimension
Dimension
Dimension
Dimension

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3.3
3.3
3.3
3.3 Antenna
Antenna
Antenna
Antenna
3.3.1 On-board Chip Antenna
USR-WIFI232-A/B/C supports a built-in antenna options, when customers choose a built-in antenna,
must comply with the following built-in antenna module placement of notes and general rules:
Be in the user's PCB board, and the red region ( 6X8 mm ) corresponding to the region cannot be
placed components and with GND;
Antenna must away from the metal, at least to the distance around the higher components above
10MM;
Antenna can no t be shielded by any meal enclosure; All cover, include plastic, shall away from
antenna at least 10MM;
Figure 13 USR-WIFI232-A/B/C
USR-WIFI232-A/B/C
USR-WIFI232-A/B/C
USR-WIFI232-A/B/C Chip
Chip
Chip
Chip Antenna
Antenna
Antenna
Antenna Keep
Keep
Keep
Keep Out
Out
Out
Out Region
Region
Region
Region
USR technological suggestions USR-WIFI232-A/B/C module be placed in the following areas of user
board, in order to reduce the antenna and a wireless signal influence, at the same time, please consult
with technology and technical support staff to assist module placement and associated regions of
Layout design.
Figure 14 Suggested
Suggested
Suggested
Suggested Module
Module
Module
Module Placement
Placement
Placement
Placement Region
Region
Region
Region
3.3.2 External Antenna
USR-WIFI232-A/B/C modules support internal antenna and external antenna option for user
dedicated application. If user select external antenna, USR-WIFI232-A/B/C modules must be
connected to the 2.4G antenna according to IEEE 802.11b/g/n standards.
The antenna parameters required as follows:

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Table 5 USR-WIFI232-A/B/C External Antenna Parameters
3.4
3.4
3.4
3.4 Evaluation
Evaluation
Evaluation
Evaluation Kit
Kit
Kit
Kit
USR provides the evaluation kit to promote user to familiar the product and develop the detailed
application. The evaluation kit shown as below, user can connect to USR-WIFI232-A/B/C module
with the RS-232 UART port, 100M Eth port or Wireless port to configure the parameters, manage
the module or do the some functional tests.
Figure 15 USR-WIFI232-
USR-WIFI232-
USR-WIFI232-
USR-WIFI232- A/B
A/B
A/B
A/B module
module
module
module Evaluation
Evaluation
Evaluation
Evaluation Kit
Kit
Kit
Kit
Table 6 USR-WIFI232- A/B Evaluation Kit Interface Description
Item Parameters
Frequency range 2.4~2.5GHz
Impedance 50 Ohm
VSWR 2 (Max)
Return Loss -10dB (Max)
Connector Type I-PEX or populate directly

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Figure 16 USR-WIFI232-Ca/Cb
USR-WIFI232-Ca/Cb
USR-WIFI232-Ca/Cb
USR-WIFI232-Ca/Cb module
module
module
module Evaluation
Evaluation
Evaluation
Evaluation Kit
Kit
Kit
Kit
Table 7 USR-WIFI232-Ca/Cb module Evaluation Kit Interface Description
Function
Function
Function
Function
Name
Name
Name
Name Description
Description
Description
Description
External
External
External
External
Interface
Interface
Interface
Interface
DC jack
5V power input connector
DB9
Male serial jack of 9-pin,and used to connect to
PC
RJ-45 100M Eth Interface
Module 2x7 2mm DIP connector , connect WIFI module
LED
LED
LED
LED Power
(Red)
3.3V Power Indicator
TXD TXD Indicator
RXD RXD Indicator
Ready nReady/GPIO Indicator
Link nLink/GPIO Indicator
Button
Button
Button
Button
Reset
Used to reset the module.
Reload Module restore to factory default configuration.