Shandong USR IOT Technology USR-WIFI232 Serial to WIFI Module User Manual

Shandong USR IOT Technology Limited Serial to WIFI Module

User Manual

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Date Submitted2016-08-17 00:00:00
Date Available2016-08-18 00:00:00
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Document Lastmod2016-08-12 11:39:15
Document TitleUser Manual

USR-WIFI232-B2 User Manual
http://www.usriot.com
USR-WIFI232-B2
Embedded WiFi Module User Manual
Version：V6.0.
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 Of Contents
1 Quick Start.................................................................................................................................................... 6
1.1 Hardware connect............................................................................................................................ 6
1.2 Network connection......................................................................................................................... 7
1.3 communication test.......................................................................................................................... 8
2 Product Overview........................................................................................................................................ 9
2.1 General Description......................................................................................................................... 9
2.2 Device Features............................................................................................................................... 9
2.3 Device Paremeters...........................................................................................................................9
2.4 Key Application............................................................................................................................... 10
2.5 Package Information...................................................................................................................... 11
2.5.1 Recommended Reflow Profile.......................................................................................... 11
2.5.2 Device Handling Instruction (Module IC SMT Preparation).........................................11
3 Hardware Introduction.............................................................................................................................. 12
3.1 Pins Definition.................................................................................................................................12
3.1.1 USR-WIFI232-B2 Pins Definition.....................................................................................12
3.2 Mechanical Size............................................................................................................................. 13
3.2.1 USR-WIFI232-B2................................................................................................................13
3.3 Antenna............................................................................................................................................14
3.3.1 External Antenna................................................................................................................ 14
3.4 Evaluation Kit.................................................................................................................................. 14
3.5 Hardware Reference Design........................................................................................................16
3.5.1 Hardware Typical Application........................................................................................... 16
3.5.2 10/100M Ethernet Interface.............................................................................................. 17
3.5.2.1 Ethernet Connection with Transformer................................................................17
3.5.2.2 Ethernet Connection without Transformer.......................................................... 17
3.5.3 UART Interface....................................................................................................................18
3.5.4 Power Interface...................................................................................................................19
4 Modules Function Description.................................................................................................................19
4.1 User configuration process...........................................................................................................19
4.2 Working mode.................................................................................................................................20
4.2.1 Transparent Mode.............................................................................................................. 20
4.2.2 Serial command mode.......................................................................................................21
4.2.3 GPIO mode..........................................................................................................................22
4.2.4 HTTPD Client mode........................................................................................................... 22
4.3 Wireless Networking......................................................................................................................23
4.3.1 STA........................................................................................................................................24
4.3.2 AP.......................................................................................................................................... 24
4.3.3 AP+STA................................................................................................................................ 25
4.4 Ethernet Interface Communication............................................................................................. 26
4.4.1 USR-WIFI232-B2 Ethernet Interface Networking (As AP).......................................... 26
4.4.2 USR-WIFI232-B2 Ethernet Interface Networking (As STA, N-Ver)........................... 27
4.4.3 USR-WIFI232-B2 Ethernet Interface Networking (As STA, Z-Ver)............................27
4.5 WI-FI parameter setting................................................................................................................ 28
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4.5.1 Auto- Frequency Function.................................................................................................28
4.5.2 Security.................................................................................................................................28
4.5.3 Search Function for STA................................................................................................... 28
4.5.4 Address Binding.................................................................................................................. 28
4.6 UART Frame Scheme................................................................................................................... 29
4.6.1 UART Free-Frame..............................................................................................................29
4.6.2 UART Auto-Frame.............................................................................................................. 29
4.7 Network Setting.............................................................................................................................. 29
4.7.1 Socket A............................................................................................................................... 30
4.7.2 Socket B............................................................................................................................... 30
4.8 New function................................................................................................................................... 30
TCP password authentication.....................................................................................................30
4.8.1 Registered Package ID/MAC............................................................................................31
4.8.2 Self-adaption Baudrate......................................................................................................31
4.8.3 WEB IO.................................................................................................................................31
4.8.4 Keepalive............................................................................................................................. 32
4.8.5 Multiple STA parameters................................................................................................... 32
4.8.6 Websocket........................................................................................................................... 32
4.8.7 Fast access Wi-Fi(usr-link)............................................................................................... 33
4.9 Palmodic Signal..............................................................................................................................34
4.10 Parameters Configuration.......................................................................................................... 35
4.11 Firmware Upgrade....................................................................................................................... 35
Web Accessing and AT command set....................................................................................................... 36
4.12 Configuration via Web Accessing............................................................................................. 36
4.12.1 Open Web Management Interface................................................................................ 36
4.12.2 Quick Configure................................................................................................................ 37
4.12.3 Mode Selection Page.......................................................................................................37
4.12.4 AP Interface Setting Page...............................................................................................38
4.12.5 STA Interface Setting Page.............................................................................................38
4.12.6 Application Setting Page................................................................................................. 39
4.12.7 Ethernet Setting................................................................................................................ 40
4.12.8 HTTPD Client Mode.........................................................................................................41
4.12.9 WEB IO.............................................................................................................................. 41
4.12.10 Advanced Page.............................................................................................................. 42
4.12.11 Device Management Page........................................................................................... 42
4.13 AT command Introduction...........................................................................................................43
4.13.1 Configuration Mode..........................................................................................................43
4.13.1.1 Switch to Configuration Mode.............................................................................44
4.13.2 AT+ Instruction Set Overview......................................................................................... 44
4.13.2.1 Instruction Syntax Format................................................................................... 46
4.13.2.2 AT+ command Set................................................................................................ 47
4.13.2.2.1 AT+E............................................................................................................ 49
4.13.2.2.2 AT+ENTM....................................................................................................49
4.13.2.2.3 AT+NETP.................................................................................................... 49
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4.13.2.2.4 AT+UART.................................................................................................... 50
4.13.2.2.5 AT+UARTF..................................................................................................50
4.13.2.2.6 AT+UARTFT............................................................................................... 50
4.13.2.2.7 AT+UARTFL............................................................................................... 51
4.13.2.2.8 AT+TMODE................................................................................................ 51
4.13.2.2.9 AT+WMODE............................................................................................... 51
4.13.2.2.10 AT+WSKEY.............................................................................................. 52
4.13.2.2.11 AT+WSSSID............................................................................................. 52
4.13.2.2.12 AT+ WSLK................................................................................................ 52
4.13.2.2.13 AT+WEBU.................................................................................................53
4.13.2.2.14 AT+WAP....................................................................................................53
4.13.2.2.15 AT+WAKEY.............................................................................................. 54
4.13.2.2.16 AT+HIDESSID..........................................................................................54
4.13.2.2.17 AT+MSLP..................................................................................................55
4.13.2.2.18 AT+WSCAN..............................................................................................55
4.13.2.2.19 AT+ TCPLK...............................................................................................55
4.13.2.2.20 AT + TCPDIS............................................................................................55
4.13.2.2.21 AT+ WANN................................................................................................56
4.13.2.2.22 AT+ LANN.................................................................................................56
4.13.2.2.23 AT+DHCPDEN.........................................................................................57
4.13.2.2.24 AT+ DHCPGW......................................................................................... 57
4.13.2.2.25 AT+ TCPTO.............................................................................................. 57
4.13.2.2.26 AT+ MAXSK..............................................................................................58
4.13.2.2.27 AT+TCPB.................................................................................................. 58
4.13.2.2.28 AT+TCPPTB.............................................................................................58
4.13.2.2.29 AT+TCPADDB..........................................................................................59
4.13.2.2.30 AT+TCPTOB.............................................................................................59
4.13.2.2.31 AT+TCPLKB............................................................................................. 59
4.13.2.2.32 AT+EPHY..................................................................................................59
4.13.2.2.33 AT+STTC.................................................................................................. 60
4.13.2.2.34 AT+DOMAIN.............................................................................................60
4.13.2.2.35 AT+FUDLX................................................................................................60
4.13.2.2.36 AT+MMID.................................................................................................. 61
4.13.2.2.37 AT+IDFIR.................................................................................................. 61
4.13.2.2.38 AT+IDEVE.................................................................................................61
4.13.2.2.39 AT+AABR..................................................................................................62
4.13.2.2.40 AT+RELD.................................................................................................. 62
4.13.2.2.41 AT+Z.......................................................................................................... 62
4.13.2.2.42 AT+MID..................................................................................................... 62
4.13.2.2.43 AT+VER.....................................................................................................62
4.13.2.2.44 AT+H..........................................................................................................62
4.13.2.2.45 AT+ HTTPURL......................................................................................... 63
4.13.2.2.46 AT+ HTTPTP............................................................................................63
4.13.2.2.47 AT+ HTTPPH............................................................................................63
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4.13.2.2.48 AT+ HTTPCN........................................................................................... 63
4.13.2.2.49 AT+ HTTPUA............................................................................................64
4.13.2.2.50 AT+WSSSIDA.......................................................................................... 64
4.13.2.2.51 AT+WSSSIDB.......................................................................................... 64
4.13.2.2.52 AT+WSSSIDC.......................................................................................... 65
4.13.2.2.53 AT+WSKEYA............................................................................................65
4.13.2.2.54 AT+WSKEYB............................................................................................65
4.13.2.2.55 AT+WSKEYC........................................................................................... 66
4.13.2.2.56 AT+ WSQY............................................................................................... 67
4.13.2.2.57 AT+ HTPMODE....................................................................................... 67
4.13.2.2.58 AT+ HTPSV.............................................................................................. 67
4.13.2.2.59 AT+ HTPTP.............................................................................................. 67
4.13.2.2.60 AT+ HTPURL............................................................................................68
4.13.2.2.61 AT+ HTPHEAD........................................................................................ 68
4.13.2.2.62 AT+ REGEN............................................................................................. 68
4.13.2.2.63 AT+ REGTCP...........................................................................................69
4.13.2.2.64 AT+ REGID...............................................................................................69
5 USR-WIFI232-A/B/C Usage Introduction.............................................................................................. 69
5.1 Module Debug................................................................................................................................ 69
5.1.1 Software Debug Tools........................................................................................................69
5.1.2 Network Connection...........................................................................................................70
5.1.3 Debug................................................................................................................................... 70
5.2 Use Cases.......................................................................................................................................72
5.2.1 Wireless Control Application.............................................................................................72
5.2.2 Remote Management Application....................................................................................73
5.2.3 Transparent Serial Port Application................................................................................. 73
5.2.4 Wireless Data Acquisition Card Application................................................................... 74
Appendix B: Disclaimer................................................................................................................................76
Appendix C: History......................................................................................................................................76
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1 Quick Start
USR-WIFI232 series product is used to transmit data between RS232 and WIFI TCPIP
transparently, user can update the product to WIFI control without knowing the WIFI and TCPIP
detail. All the convert work is done by the module. For 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. The setup work only need do once, then it
will save the setting forever.
This chapter is a user guide for USR-WIFI232 series products. We suggest users follow the guide
to test module at first, and will have a good understanding of the modules. Users 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
We can also submit the issue to our customer support center:
http://h.usriot.com
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.
Figure 1 hardware connection diagram
About the serial connection, because the module RS232 is 3.3V TTL level, 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-B2 evaluation
board for users to choose.
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1.2 Network connection
The following is the USR-WIFI232-B2 module example,Other modules are the same.Open Wi-Fi,
search network, as shown in below, USR-WIFI232-B2_3378(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 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 connection
Now, nlink led of USR-WIFI232-B2 Evaluation Board is lighting.
1.3 communication test
Module’s default setting:
 SSID:USR-WIFI232-B2;
 Encryption mode:open，none;
 UART:57600,8,1,None;
 Network parameters：TCP,Server,8899,10.10.100.254;
 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):
Choose 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):
Choose 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 / network transmission test
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2 Product Overview
2.1 General Description
USR-WIFI232-B2 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-B2 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-B2 as a hot spot can accommodate 32 clients simultaneously wi-fi access, but also
can accommodate 32 TCP client.
2.2 Device Features

Support IEEE802.11b/g/n Wireless Standards

Support TCP/IP/UDP Network Protocols

Support UART/GPIO/Ethernet Data Interface

Support Work As STA/AP/AP+STA Mode

Support Router/Bridge Mode Networking

Support External Antenna(max 280m)

Support Transparent Transmission Mode

Support AT+ Instruction Set for Configuration

Support Friendly Web Configuration Page

Support Palmodic Signal

Support UART Auto-Frame Function

Single +3.3V Power Supply

FCC/CE Certificated

Support customization
2.3 Device Paremeters
Table 1
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USR-WIFI232-B2 Module Technical Specifications
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Class
Wireless
Parameters
Item
Parameters
Certification
Wireless standard
Frequency range
FCC/CE
802.11 b/g/n
2.412GHz-2.462GHz
802.11b: +20 dBm (Max.)
802.11g: +18 dBm (Max.)
802.11n: +15 dBm (Max.)
Configurable
802.11b: -89 dBm
802.11g: -81dBm
802.11n: -71dBm
Transmit Power
Receiver Sensitivity
Antenna Option
External:I-PEX Connector
Data Interface
Hardware
Parameters
Software
Parameters
http://www.usriot.com
Operating Voltage
Operating Current
Operating
Temperature
Storage Temperature
Dimensions and Size
Network Type
Security Mechanisms
Encryption
Work Mode
AT command
Network Protocol
Max. TCP Connection
User Configuration
UART: 300bps - 460800bps
GPIOs
Ethernet: 100Mpbs
3.3V (+/-5%)
170mA~300mA
-40℃- 85℃
-40℃- 125℃
25×40×8mm
Station /AP mode/STA+AP
WEP/WAP-PSK/WAP2-PSK
WEP64/WEP128/TKIP/AES
Transparent Mode/Serial command
AT+instruction set
TCP/UDP/ARP/ICMP/DHCP/DNS/HT
TP
32
Web Server＋AT command config.
2.4 Key Application





Remote equipment monitoring
Industrial sensors and controls
Asset tracking and telemetry
Home automation
Medical devices
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2.5 Package Information
2.5.1
Recommended Reflow Profile
Figure 5 Reflow Soldering Profile
Table 2 Reflow Soldering Parameter
Temperature (Degree)
NO.
Item
Reflow Time
Peak-Temp
Time of above 220
Time(Sec)
35~55 sec
260 max
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.
 Recommend 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:
Window time means from last bake end to next reflow start that has 168 hours space.


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3 Hardware Introduction
3.1 Pins Definition
3.1.1
USR-WIFI232-B2 Pins Definition
Figure 6 USR-WIFI232-B2
Figure 7 USR-WIFI232-B2 Pins Map
Table 3 USR-WIFI232-B2 Pins Definition
Pin
Description
Name
Ground--GND
VCC 3.3V@350mA
UART Data Transmit
GPIO
UART Data Receive
GPIO
UART sends request
of data transmission
GND
3.3V
UART_TXD
GPIO3
UART_RXD
GPIO4
UART_RTS
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Directio
Power
Power
I/O
I/O
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Note
Ground
3.3V @ 350mA power input
If not use UART function,
this 4 pins can be configured
as GPIO pins, and can
change GPIO pin status
through AT command
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GPIO
GPIO5
I/O
UART receives data
transmission
permission
GPIO
Module reset signal
UART_CTS
GPIO6
RESET
I/O
WiFi status Indication
GPIO
nLink
GPIO8
I/O
Indicate the module
status of power on
process
GPIO
nReady
GPIO9
I/O
10
Restore configuration
GPIO
nReload
GPIO10
I/O
11
12
13
14
Ethernet Input+
Ethernet InputEthernet Output+
Ethernet Output-
PHY_RX+
PHY_RXPHY_TX+
PHY_TX-
http://www.usriot.com
“Low ( 0 )” effective reset
input.
The reset duration should be
kept more than 300ms
“0”- WIFI connection
available
“1”- No WIFI connection
Can be configured as GPIO.
“0” or “Palmodic Signal” Finish module boot up
process;
“1” - Module boot up not
finish.
Can be configured as GPIO.
Module will Restore factory
default configuration after set
this pin “0” more than 1s,
then set “1”.
+1.8V Ethernet Data
Interface
Support transformer and
direct connection (AC
couple) mode.
3.2 Mechanical Size
USR-WIFI232-B2 modules physical size (25x40mm) as follows:
3.2.1
USR-WIFI232-B2
USR-WIFI232-B2 module Mechanical Size:
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Figure 8 USR-WIFI232-B2 Mechanical Size
3.3 Antenna
3.3.1
External Antenna
USR-WIFI232-B2 modules support external antenna,USR-WIFI232-B2 modules must be
connected to the 2.4G antenna according to IEEE 802.11b/g/n standards.
The antenna parameters required as follows:
Table 4 USR-WIFI232-B2 External Antenna Parameters
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
3.4 Evaluation 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-B2 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.
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Figure 9 USR-WIFI232-A/B module Evaluation Kit
Table 5 USR-WIFI232-A/B Evaluation Kit Interface Description
Function
Name
Description
External
5V power input connector
DC jack
Interface
Male serial jack of 9-pin,and used to connect to
DB9
PC
RJ-45
100M Eth Interface
Module
2x7 2mm DIP connector, connect WIFI module
LED
Power
3.3V Power Indicator
(Red)
TXD
TXD Indicator
RXD
RXD Indicator
Ready
nReady/GPIO Indicator
Link
nLink/GPIO Indicator
Used to reset the module.
Button
Reset
Reload
Module restore to factory default configuration.
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3.5 Hardware Reference Design
3.5.1
Hardware Typical Application
Figure 10
USR-WIFI232-B2 Hardware Typical Application
Notes：
nRST- Module hardware reset signal. Input. Logics “0” effective.
There is 100K Ohm pull-up resister internal up to 3.3V. When module power up or some issue
happened, MCU need assert nRST signal “0” at least 300ms, then set” 1” to keep module fully
reset.
nReady- Module boot up ready signal. Output. Logics “0” effective.
There is 4.7K Ohm pull-up resister internal up to 3.3V. The module will output “0” “or “Palmodic
Signal” after normal boot up. This signal used to judge if module finish boot up and ready for
application or working at normal mode.
nLink- Module WIFI connection indication. Output.
There is 4.7K Ohm pull-up resister internal up to 3.3V. When module connect to AP (STA mode)
or some WiFi STA connect to module (AP mode), the module will output “0”. This signal used to
judge if module already at WiFi connection status.
nReload- Module restore to factory default configuration.Input. Logics “0” effective.
User can assert nReload signal “0” more than 3’s through button or MCU pin, then release,
module will restore to factory default configuration and re-start boot up process. User need add
4.7K~10K Ohm pull-up resister external the module.
UART_TXD/RXD- UART port data transmit and receive signal.
There is 1K Ohm pull-down resister internal. User can’t add pull-up resister at these pins.
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3.5.2
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10/100M Ethernet Interface
USR-WIFI232-A/B/C modules provide one 10/100M Ethernet PHY layer interface for data
transition or user configuration. This Ethernet support with transformer and without transformer
(PHY-to-PHY) 2 kinds of connection.
3.5.2.1 Ethernet Connection with Transformer
User board put Ethernet transformer and RJ-45 connector. This is a general 10/100M Ethernet
phy layer connection. The reference design as following:
(Above is for USR-WIFI232-B2 pin type module)
Figure 11
Ethernet Reference Design with Transformer
3.5.2.2 Ethernet Connection without Transformer
For this application, Ethernet will work as internal data transmition interface and save one
transformer and RJ45 connector. Ethernet PHY-to-PHY connection will use AC coupled
connection. This is a space and cost optimized solution. Hardware reference design as following:
Note: VCC signal at reference design shall base on user board PHY chipset voltage level, such
as 2.5V power supply for general Ethernet PHY chipset.
(Above is for USR-WIFI232-B2 pin type module)
Figure 12
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This module Ethernet interface default is for the application with transformer connection. If you
need PHY-PHY directly connection, please change the hardware as follows:
1. Weld 0 ohm resistance in red position
2. Remove the component in yellow position
BOT side component
TOP side component
Figure 13 Schematic resistance changes
Specific PHY-PHY direct connection reference to user manual chapter 1.3.2.2 application of
Ethernet without transformer and AT+FEPTP command
The command:
AT+FVEW=enable to open ethernet WAN port function
Remark:
1. Only when ethernet as WAN, this command is needed. Module default LAN port.
2. After this command, make sure module WAN IP and LAN IP in different segment. (Modify the
ALN IP in AP Settings, modify the WAN IP in STA Settings)
AT+FEPTP=on Quey/set default ethernet PHY-PHY on/off
AT+FEPHY=on Open ethernet function permanently
AT+RELD
Command with “F” need to be affective after AT+RELD
After module reset, command effect, then will not impact by Reload
For user’s design, pls note:
1. Cable connection should be AC coupling, your cable need be pulled up to VCC (fit with PHY
chip level)
2. Cable TX connected to RX. In PHY-PHY direct connection, PHY chip dose not support
direct/ cross self-adaption
3.Your PHY chip on board should better to be forced into 100M work mode
3.5.3
UART Interface
UART interface is the serial data transmition interface mainly used for USR-WIFI232-B2 modules.
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User can add RS-232 chipset on user board and convert the signal to RS-232 voltage to
communicate with outside equipment or sensors. USR-WIFI232-B2 modules UART interface
include 4 general signals: TXD/RXD/RTS/CTS. The hardware reference design with RS-232
chipset as following:
Figure 14
Figure 10 UART Interface Reference Design
Notes: TXD pin is also hardware configuration pin internal module. So this pin MUST pull-down
during module power up. USR-WIFI232-B2 modules provide internal pull-down resister, user can’t
add pull-up/pull-down resister on user board, which may cause module can’t work.
3.5.4
Power Interface
USR-WIFI232-B2 module support single +3.3V power supply. The peak current shall about
350mA and normal WiFi working current shall about 200mA. The power save (WiFi OFF) mode
will about 100mA
Decoupling at power pin suggested, At least one 100uF and one 10uF capacitor required at user
board and put near module power input pin will increase the reliability and performance.
4 Modules Function Description
4.1 User configuration process
After USR-WIFI232-B2 module electric starter, based on user pre-set parameters, automatically
connect to wireless networks and servers, and enter the working mode is set to open in
accordance with the default serial port parameters.
The parameters which need to configure include:
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
Wireless Network Parameters
 Wireless Network Name（SSID）
 Security Mode
 Encryption Key

TCP/UDP Linking Parameters
 Protocol Type
 Link Type（Server or Client）
 Target Port ID Number
 Target Port IP Address

Serial Port Parameters
 Baud Rate
 Data Bit
 Parity (Check) Bit
 Stop Bit
 Hardware Flow Control
http://www.usriot.com
Work Mode Selection
 Transparent mode/Serial command mode/GPIO mode
The following sections will introduce specific to each part in detail.

4.2 Working mode
4.2.1
Transparent Mode
USR-WIFI232-B2 modules support serial interface transparent transmission mode. The benefit of
this mode is achieves a plug and play serial data port, and reduces user complexity furthest. In
this mode, user should only configure the necessary parameters. After power on, module can
automatically connect to the default wireless network and server.
As in this mode, the module's serial port always work in the transparent transmission mode, so
users only need to think of it as a virtual serial cable, and send and receive data as using a
simple serial. In other words, the serial cable of users’ original serial devices is directly replaced
with the module; user devices can be easy for wireless data transmission without any changes.
The transparent transmission mode can fully compatible with user’s original software platform
and reduce the software development effort for integrate wireless data transmission.
Notes: Users also open the serial port hardware flow control (CTS/RTS) function, so that we can
make the bit error rate to a minimum.If the user doesn't need hardware flow control function of the
serial port, only need to the corresponding pin foot (CTS/RTS) hung up.
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4.2.2
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Serial command mode
In this mode, the user can send the serial data to a different server address, this pattern can be
use udp or TCP client sends data to the server.
Customer MCU send packets according to the following format, parsing module is finished, only
the n bytes of data sent to the destination address.When data is returned, not analytical data from
serial port output directly.
frame
header
length
(n+m+5)
Table 6 Protocol table of Serial command mode
functio
Backup
Destinati
Target
data area
on port
address
byte
Data
Sum
check
frame header：
0x55 0xAA（Constant）
Length：
Starting from the function byte, to Sum check (does not contain the sum check) all bytes.
High byte at the front
Function byte：
Bit0:（UDP:0 ;TCP:1）
Bit1:（Short connection:0;Long connection:1）
Bit2:（IP:0;Domain name:1）
Bit7:（cut protocol:0;full protocol:1）Note: currently only supports cut protocol
Notes:
 Bit1:If it is a short connection, it sends data, and then will be disconnected; if it is long
connection, it sends data, connection will remain, until the re changing the target address.
 Bit2:Indicates that the target address is IP or domain name. If it is IP, the target address is 4
bytes; if the domain name, the target address length for the entire domain name string length
(the last byte address is ‘\0’, that is the end of the string).
 Bit7:Under the cut protocol, reply frame contains only data; Under the full protocol, reply
frame has "failed to send", "waiting for", "UDP radio response equipment IP" frame data.
Backup data area:
 First byte:If it is a short connection, this position is TCP waits for the timeout time (1-255), if
the send command is completed, did not receive a response, then wait a few seconds and
the corresponding, if 5, said to wait for the 5S to disconnect; if the sending command,
immediately receive the returned data, then immediately disconnected; if it is long connection,
this position is 0x00.
 Second byte:Reserve
Destination port:
Little endian, low byte in the former,such as port 23, here are 0x17 0x00
Target address:
If it is IP, is 4 bytes, for example, 192.168.0.7 said 0x07 0x00 0xA8 0xC0; if it is a domain
name, then the address of indefinite length,ending with the’\0'.
Data:
Variable length,the maximum not exceeding 1000bytes.
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Sum check:
From the function word to check byte (does not contain a check byte), add Sum check.
The following is an example of a specific application:
send data:0x55 0xaa 0x00 0x0a 0x00 0x00 0x00 0x21 0x00 0x85 0x00 0xA8 0xC0 0x01 0x0f
Length:0x00 0x0a
Function byte:0x00 (UDP;Short connection;IP;cut protocol)
Destination port:0x21 0x00(33)
Target address:0x85 0x00 0xA8 0xC0 (192.168.0.133)
Data:0x01(data length :1)
Sum check:0x0f (0x00+0x00+0x00+0x21+0x00+0x85+0x00+0xA8+0xC0+0x01=0x0f)
4.2.3
GPIO mode
USR-WIFI232-B2 module support GPIO mode:At GPIO,UART (TXD/ RXD/CTS/RTS) defined as
GPIO and others (Ready/Link/) also defined as GPIO pin.
When module works at GPIO mode, PC and other equipments can setup connection (TCP/UDP)
through WiFi, then read/write GPIO information through command.
 GPIO n IN,
Set GPIOn as input, Response GPIO OK or GPIO NOK;
 GPIO n OUT 0, Set GPIOn as output and output ‘0’, Response GPIO OK or GPIO NOK;
 GPIO n OUT 1, Set GPIOn as output and output ‘1’, Response GPIO OK or GPIO NOK;



GPIO n SW,
Set GPIOn as output and switch the output status, Response GPIO OK or
GPIO NOK;
GPIO n PWM m1 m2, Set GPIOn output a wave: m1 is ‘high’ duration and m2 is ’low’
duration (Time unit is ‘ms’ and minimal is 10ms), Response GPIO OK or GPIO NOK;
GPIO n GET, Read GPIOn status, Response I0,I1,O0,O1, means ” input low ” , ” input
high”,”output low”,”output high”
Notes: n can be 3, 4, 5, 6, 8, 9 corresponding module pin. GPIO 4 can only defined as input and
GPIO 3 can only defined as output.
GPIO READ returns all current IO status, and GPIO n GET said method. Such as, I1I1I0I0I0I0O1,
I said input, O output. 0 low, 1 express high.4 pin is negated. Read the 1 actual 0 actual 1, read
the 0.
4.2.4
HTTPD Client mode
This mode is used to send data to the HTTP server.
After setting the HTTP header format by webpage or AT command, the data sent each time by
UART will add the HTTP header automatically.Convenient for the user directly submit data or
read data from the HTTP server.
Below is the specific application, for example:
The first set HTTP parameters using AT instructions.
AT+HTTPURL=192.168.1.1,80
The serveraddress and portsettings
AT+HTTPTP=POST
Set the HTTP type, GET, PUT or POST
AT+HTTPPH=/set
Set the path,the mostis50 bytes
AT+HTTPCN=keep-alive
Set the Connection,maximum length of 20bytes
AT+HTTPUA=lwip13.2
Set the User-Agent,maximum length of 20bytes
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If the sending data is 1234.In the 80 port of 192.168.1.1 will receive the following data
POST /set HTTP /1.1
Connection:keep-alive
User-Agent:lwip1.3.2
Content-Length:4
Host:192.168.1.1:80
1234
If the HTTP type is GET, the 80 port 192.168.1.1 receive data
POST /set1234 HTTP /1.1
Connection:keep-alive
User-Agent:lwip1.3.2
Content-Length:0
Host:192.168.1.1:80
Data received from server will be directly sent to the serial port,without any treatment.
Note: after V5.01.14 version of the firmware it add a new method of HTTP header definition,
called the new mode, the way at above, is called the old mode.
Users can custom HTTP headers in the way of the new mode, can add, delete, modify the
contents of each HTTP header (if the HTTP request type is POST/PUT, module will automatically
add the Content - Length).Including the AT + HTPMODE, AT + HTPSV, AT + HTPTP, AT +
HTPURL, AT + HTPHEAD, specific instructions please refer to the AT command set process
section.Similarly, also has the corresponding Settings page in the web page.
Note: in the new mode, if you use the AT command set HTTP headers, Please use the
"<>" instead of carriage "return",in the web page,you don't need to worry about the
"return".
4.3 Wireless Networking
USR-WIFI232-B2 module can be configured as both wireless STA and AP base on network type.
Logically there are two interfaces in USR-WIFI232-B2. One is for STA, and another is for AP.
When USR-WIFI232-B2 works as AP, other STA equipments are able to connect to wireless LAN
via USR-WIFI232-B2 module. Wireless Networking with USR-WIFI232-B2 is very flexible.
Following figure shows the functional architecture of USR-WIFI232-B2 module:
Figure 15
USR-WIFI232-B2 Functional Architecture
Notes:
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AP: that is the wireless Access Point, the founder of a wireless network and the center of the
network nodes. The wireless router we use at home or in office may be an AP.
STA: short for Station, each terminal connects to a wireless network (such as laptops, PDA and
other networking devices) can be called with a STA device.
4.3.1
STA
Infrastructure: it’s also called basic network. It built by AP and many STAs which join in.
The characters of network of this type are that AP is the center, and all communication between
STAs is transmitted through the AP. The figure following shows such type of networking.
Figure 16
4.3.2
USR-WIFI232-B2 Basic Wireless Network Structure
AP
Because USR-WIFI232-B2 can be set to AP, can also be set to STA, so the USR-WIFI232-B2 can
be achieved easily wireless ad hoc network.
As showing in the figure below, USR-WIFI232-B2 (1) can be treat as an AP, and USR-WIFI232B2 (2), USR-WIFI232-B2 (3) and the laptop are STAs connected to USR-WIFI232-B2 (1).
Meanwhile, all USR-WIFI232-B2 modules can connected to user device via UART interface. All
USR-WIFI232-B2 modules can be operated and managed through the laptop. So it is convenient
to O&M all USR-WIFI232-B2 modules. Moreover, in such Adhoc network structure, the whole
coverage of a wireless network can be extended easily.
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Figure 17
4.3.3
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USR-WIFI232-B2 STA Network Structure
AP+STA
USR-WIFI232-B2 module support AP+STA network mode, means module support one AP
interface and one STA interface at the same time, as following figure,
Figure 18
USR-WIFI232-B2 AP+STA Network Structure
When module enables AP+STA function, Module’s STA interface can connect with router and
connect to TCP server in the network. At the same time, module’s AP interface is also active and
permit phone/PAD to connect through TCPB, then phone/PAD can control user device and and
setting the module parameters,
The advantage of AP+STA mode is:
 Users can easily setting and track user device through Phone/PAD and not change the
orginal network setting.
 Users can easily setting module’s parameters through WiFi when module works as STA
mode.
AP+STA Mode Setting:
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AP+STA mode need serial AT command to enable as follows:
 AT+FAPSTA=on, Enable AP+STA mode;
 Then, when you configure module works as STA mode, it’s AP interface still active;
AP+STA Mode Notes:
When user enable
AT+STA function,the STA port need to keep connected with other
router(AP),
or STA port will have to scan the AP frequently ,which will affect AP port function and may cause
some date loss.
So ,if user confirm STA port can't connect with AP at some time,user can disable the STA scan
through the following command:
 AT+STTC=on/off,on:Scan AP;off:No Scan AP.
After re-start module,this command not saved;
 AT+FSTTC=on/off;
This command is saved after re-staring the module;
4.4 Ethernet Interface Communication
USR-WIFI232-B2 module provides one 100M Ethernet interface. With this Ethernet interface,
user can easily realize the three interface (WiFi, UART, and Ethernet) intercommunication and
networking. USR-WIFI232-B2 module can configured as Bridge Mode or Router Mode base on
different networking technology.
Notes: As the Ethernet mode will increase additional consumption, so it is default closed. If you
need this function, pls use AT+FEPHY=on to open it and RELD can’t change this. For different
application, USR-WIFI232-610 need version switch via commands (such as following description
of N-ver and Z-ver). With command AT+FVER=n to switch to N-ver and with command
AT+FVER=z to switch to Z-ver.
4.4.1
USR-WIFI232-B2 Ethernet Interface Networking (As AP)
Figure 19
USR-WIFI232-A/B/C Ethernet Interface Networking (As AP)
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USR-WIFI232-B2 module works as AP and also the center of this network. All devices’ IP address
in this network shall use the same network segment with USR-WIFI232-B2 and they can
ntercommunication with this method.
4.4.2
USR-WIFI232-B2 Ethernet Interface Networking (As STA, N-Ver)
Figure 20
USR-WIFI232-B2 Ethernet Interface Networking (As STA, N-Ver)
USR-WIFI232-B2 module works as STA (Software is N-Version), and module set as router mode.
When module connect to AP, it will get wireless port IP address from AP (For example:
192.168.1.100). At the same time, module also form a subnet (Default 10.10.100.254) and all
devices connected to module Ethernet interface will get assigned IP address (For example:
10.10.100.101).So as shown, PC1 at internal subnet can initiate a connection to PC2 (For USRWIFI232-B2 works as router mode), but PC2 can’t active initiate a connection to PC1.
4.4.3
USR-WIFI232-B2 Ethernet Interface Networking (As STA, Z-Ver)
Figure 21
USR-WIFI232-B2 Ethernet Interface Networking (As STA, Z-Ver)
For above networking, USR-WIFI232-B2 module works as STA （ Firmware is Z-Version ） ,and
module configured as bridge mode. When module connect to AP, all devices connected to
module Ethernet interface will get assigned IP address from AP (For example: 192.168.1.101).For
module works as bridge mode, it can be treated as a transparent device and PC1, PC2 can
communicate without any limit. But in this networking, USR-WIFI232-A/B/C module needs assign
a static LAN IP address (For example: 192.168.1.10) if module also needs communication with
AP or configuration through web page.
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4.5 WI-FI parameter setting
4.5.1
Auto- Frequency Function
When module works as STA, USR-WIFI232-B2 will adjust its wireless channel to keep the same
channel with associated AP and connect in.
When module works as AP and USR-WIFI232-B2 enable Auto-frequency function, then when
module boot up, it will select the best wireless channel based on surrounding environment.
4.5.2
Security
USR-WIFI232-B2 module supports multiple wireless encryption mechanisms, and enables to
protect the security of user’s data transmission, the mechanisms include:
4.5.3

WEP

WPA-PSK/TKIP

WPA-PSK/AES

WPA2-PSK/TKIP

WPA2-PSK/AES
Search Function for STA
When using web configuration STA Interface Setting Page, user can push “Search” button to find
surrounding AP, and find a AP to associated.
Figure 22
4.5.4
Search page
Address Binding
USR-WIFI232-B2 module supports the feature of binding the BSSID address of target network.
According to the provisions of 802.11 protocol, different wireless networks can have a same
network name (i.e. SSID / ESSID), but must correspond to a unique BSSID address (i.e. MAC
address). Illegal intruders can create a wireless network with the same SSID / ESSID, it will make
STAs in the network to join to the illegal AP, thereby and then network leakage happen.
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Users can prevent STA from joining to illegal network by binding the BSSID address, to improve
wireless network security.
4.6 UART Frame Scheme
4.6.1
UART Free-Frame
USR-WIFI232-B2 support UART free-frame function. If user select open this function, module will
check the intervals between any two bytes when receiving UART data. If this interval time
exceeds defined value (50ms default), USR-WIFI232-B2 will think it as the end of one frame and
transfer this free-frame to WiFi port, or USR-WIFI232-B2 will receive UART data until 4K bytes,
then transfer 4KB frame to WiFi port.
USR-WIFI232-B2 is default interval time is 50ms. User can also set this interval to fast (10ms)
through AT command. But user have to consider if user MCU can send UART data with 10ms
interval ,or the UART data may be divide as fragment.
Through AT command: AT+FUARTTE=fast/normal, user can set the interval time: fast (10ms) and
normal (50ms). This command is factory default setting command and AT+RELD can’t change its
value.
4.6.2
UART Auto-Frame
USR-WIFI232-B2 support UART auto-frame function. If user select open this function and setting
auto-frame trigger length and auto-frame trigger time parameters, then module will auto framing
the data which received from UART port and transmitting to the network as pre-defined data
structure.


Auto-frame trigger length: The fixed data length that module used to transmitting to the
network.
Auto-frame trigger time: After the trigger time, if UART port received data can’t reach autoframe trigger length, then module will transmitting available data to the network and bypass
the auto-frame trigger length condition.
Detailed UART auto-frame function can refer to AT+ instruction set “UARTF/UARTFT/UARTFL”
introduction.
4.7 Network Setting
USR-WIFI232-B2 module has two TCP/UDP Socket: Socket A and Socket B. Serial data written
to the module, will be sent to the Socket A and B simultaneously; TCP/UDP data that module
receives through either Socket A or B,will be sent to the serial port.
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Dual Socket through different settings, you can achieve a variety of network interconnect. When
the module shipped only open Socket A, Socket B default is not to connect, if the user needs to
use, please set by AT commands.
4.7.1
Socket A
Socket A has three work mode: TCP Server, TCP Client, UDP Client,UDP Server.The setting
method, please refer to the AT+NETP command instruction.
When Socket A configured as TCP Server, it supports Multi-TCP link connection, and maximum
32 TCP clients permitted to connect to Socket A.
Multi-TCP link connection will work as following structure:
Upstream: All dates from different TCP connection or client will be transmitted to the serial port as
a sequence.
Downstream: All data from serial port (user) will be duplicate and broadcast to every TCP
connection or client.
Detailed multi-TCP link data transmition structure as following figure:
Figure 23
4.7.2
Multi-TCP Link Data Transmition Structure
Socket B
Socket B has one work mode: TCP Client, please refer to the AT+TCPB/AT+TCPPTB/TCPADDB/
TCPTOB/TCPLKBcommand instruction.
With variety work mode, socket B can provide users with flexible data transfer methods.For
example, Socket B can connect to a remote server in order to achieve remote control.
4.8 New function
TCP password authentication
This feature is available only on the module as a TCP server, when the TCP client connection
module,
the
module
will
authenticate
each
connected
tcp.
Each TCP client first data is the “password+0x0d+0x0a” (the password is Webpage
authentication password). The default password is “admin”, so the first piece of data should be
"0x61 0x64 0x6D 0x69 0x6E 0x0D 0x0A" (Hex). If the password is correct, the module returns
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"OK",
on
the
other
hand,
return
to
the
"NO"
and
disconnect.
The TCP connection of this function can be Webpage in "TCP connection password
authentication" is opened or disable. Please refer to the specific "5.1.6" section.
4.8.1
Registered Package ID/MAC
This function only applies to the module as a TCP client, in front of the data when module
connected to the server with two bytes of ID (ID the range is 0 ~ 65535, the high byte before, and
the low byte behind) plus two bytes ID radix-minus-one complement(or upload 6 bytes MAC
address).Module is the default ID is 1111(MAC:D8B04CF20000), for example, is sent to the
server when the first four bytes "0x57 0x04 0xfb 0xa8"(or "0xD8 0xB0 0x4C 0xF2 0x00 0x00").
There are two ways to upload their own id: one is to upload their own ID/MAC for connection to
the server for the first time;The other is a plus ID/MAC in front of each data.
Registered Package related parameter is set in the "serial port and other Settings" section of the
web, build joint function of ID/MAC for the first time, and each data with the function of ID/MAC
are disabled by default.
Note: the function of the upload MAC supported in V5.01.14 and above version.
4.8.2
Self-adaption Baudrate
This feature, please cooperate with our company's virtual serial port software use.
Use a serial port connected module, and use the at command "at + AABR = on" open this
function and restart.In the USR - VOCM software "synchronous baud rate (RFC2217 similar)" is
selected, the following figure.
Specific setup process, please refer to the AT command section(5.2.2.2.39).
Figure 24
RFC 2217
In this way, the module of baud rate will be as the USR-VCOM to change at any time, and don't
have to restart the module.If restart the module, baud rate and will come back to before.
4.8.3
WEB IO
This function only work for "GPIO mode".
When the module is in the "GPIO mode", enter the Webpage in "WEB IO", you can click on the
corresponding button to control module pin level. Without the need to download and install app,
any platform, any equipment, as long as you can into the built-in Webpage of module through the
browser built-you can control module pin of IO.
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4.8.4
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Keepalive
V4.02.10. USR13 and above version of the firmware added keepalive when the TCP connection
mechanism, so when the module of network anomalies, timely diagnose abnormal to the network
and disconnect, when the network has resumed after, and just in time to connect to the server.
4.8.5
Multiple STA parameters
This function based on V4.02.10 D.U SR18 and above version of the firmware, in the sta mode, if
can network signal is too low, it will automatically switch to the other AP network (switching
network automatically restart).
This feature provides a signal threshold, when the current network signals is lower than the
critical value, the module of automatic switching network and restart.If the signal value is set to
100, the module will not switch network.Even if the current network signal is not the current
network
will
always
search,
not
heavy
to
other
networks.
The function of the specific Settings page refer to section 5.1.4.
Specific setup process, please refer to the AT command section(5.2.2.2.50-5.2.2.2.56).
4.8.6
Websocket
This module can realize the function of the websocket server, allowing serial real-time interaction
with the web module, replace the previous HTTP GET, POST, corresponding faster.This module
provides the corresponding websocket test page for user testing, specific page is as follows:(web
Page:10.10.100.254/websocketen.html)
Figure 25
Websocket Page
Click on the "connect" page and then implements a connection, so a serial port with page can
send or receive data from each other.This module websocket server support 8 client connection
at
the
same
time.
This function for web applications, and for web users with higher response speed, if you want to
customize the corresponding web page, can connect your company.
Note:This function occupy the 8000 port of module.
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Fast access Wi-Fi(usr-link)
When one module works in AP mode, it opens a UDP port used to receive fast access Wi-Fi
commands, the port number is 49000. The phone PDA can directly connect to Wi-Fi network of
the module, send commands to search router list and set SSID and password. After the
completion of set up, module will automatically restart, connected to the router, work in the STA
mode at this time.
Protocol format
Searching command
No
Name
Num of Bytes
Description
head
fixed value:0xFF
length
Sum of data bytes from length bytes to check
byte(not contain length bytes and check byte).
cmd
Command type, 0x01
check
Sum of bytes from head (not contained) byte to
check byte (not contained).
Response for searching
No
Name
Num of Bytes
Description
head
fixed value:0xFF
length
Sum of data bytes from length bytes to check
byte(not contain length bytes and check byte).
cmd
Command type, 0x81
AP num
The number of AP what module scans
SSID1
Unsized
The SSID of router 1
separator
Separator of SSID1, fixed value:0x00
Signal
Signal strength of router 1,0~100：0%~100%
strength1
separator
Separator of signal strength1, fixed value:
0x0D,0x0A
…
…
…
………
SSID n
Unsized
The SSID of router n
M+1
separator
Separator of SSID n, fixed value:0x00
M+2
Signal
Signal strength of router n,0~100：0%~100%
strength
M+3
separator
fixed value:0x0D,0x0A
M+4
check
Sum of bytes from head (not contained) byte to
check byte (not contained).
Example:
Data from phone PDA to module (HEX): FF 00 01 01 02
Data from module to phone PDA (HEX): FF 00 14 81 02 54 45 53 54 31 00 40 0D 0A 54 45 53 54
32 00 37 0D 0A 1F
Explanation:
The phone PDA send searching command to module, the response from module is: SSID of
router1 is “TEST1”, signal strength of router1 is 64%; SSID of router2 is “TEST2”, signal strength
of router2 is 55%.
Note: The information of routers is ordered by signal strength.
Setting command
No
Name
Num of Bytes
Description
head
fixed value:0xFF
length
Sum of data bytes from length bytes to check byte
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(not contain length bytes and check byte).
Command type, 0x02
fixed value:0x00
SSID of router
fixed value:0x0D,0x0A
cmd
reserve
SSID
separator
Unsized
password
check
Unsized
Password of router
Sum of bytes from head (not contained) byte to
check byte (not contained).
Num of Bytes
Description
fixed value:0xFF
Sum of data bytes from length bytes to check
byte(not contain length bytes and check byte).
Command type, 0x82
If the SSID set by PDA exist, check value is 0x01,
otherwise is 0x00.
If the form of password set by PDA is correct, check
value is 0x01, otherwise is 0x00.
Sum of bytes from head (not contained) byte to
check byte (not contained).
Response for setting
No
Name
head
length
cmd
Check for
SSID
Check for
password
check
Example:
Data from phone PDA to module (HEX): FF 00 0F 02 00 54 45 53 54 31 0D 0A 31 32 33 34 35 36
CE
Data from module to phone PDA (HEX): FF 00 03 82 01 01 87
Explanation:
The phone PDA send setting command to module, SSID is set to “TEST1”, password is set to
“123456”. The response from module is that the “TEST1” Wi-Fi network exist, the form of
password is correct.
4.9 Palmodic Signal
Base on selected factory default setting, “nReady” signal can have two output statuses:
 Status One: The module will output “0” after normal boot up. This signal used to judge if

module finish boot up and ready for application.
Status Two: The module will output “Palmodic Signal” after normal boot up.The palmodic
signal is 0.5Hz square wave with dutyfactor 1:1. User can query this signal to judge if
moduleis active “live” or need to re-boot. When module switches to command mode, it will
output “0”, which used to distinguish work mode and command mode.
Notes:
This function is user selected factory setting and RELD instruction will not effective for this
function. If user not requires this function, the default factory setting is Status One. Contact with
USR Technology for more detailed support.
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Parameters Configuration
USR-WIFI232-B2 module supports two methods to configuration parameters: Web Accessing
and AT+instruction set.
Web accessing means users can configure parameters through built-in webpage. When USRWIFI232-B2 module connected to wireless network, parameters configuration is done on a PC
connected to the same wireless network. AT+instruction set configuration means user configure
parameters through serial interface command. Refer to “AT+instruction set” chapter for more
detail.
Notes:
USR can customized the parameters setting as customer request and ship USR-WIFI232-A/B/C
modules with these parameters as factory default configuration. It will reduce user’s module
configuration time for mass production. Also, if user need different parameters setting for every
module, USR can provide the auto-configuration tool to speed up the module configuration
duration. Please contact USR technical interface to acquire this tool if required.
4.11
Firmware Upgrade
USR-WIFI232-B2 module supports firmware upgrade online.
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Web Accessing and AT command set
4.12
Configuration via Web Accessing
When first use USR-WIFI232-B2 modules, user may need some configuration. User can connect
to USR-WIFI232-B2 module’s wireless interface with following default setting information and
configure the module through laptop.
Table 7 USR-WIFI232-B2 Web Access Default Setting
Parameters
Default Setting
SSID
USR-WIFI232-B2_xxxx
IP Address
10.10.100.254
255.255.255.0
Subnet Mask
admin
User Name
Password
admin
4.12.1 Open Web Management Interface
Step 1: Connect laptop to SSID “USR-WIFI232-B2_xxxx” of USR-WIFI232-A/B/C module via
wireless LAN card;
Step 2: After wireless connection OK. Open Wen browser and access “http://10.10.100.254”;
Step 3: Then input user name and password in the page as following and click “OK” button.
Figure 26
Open Web Management page
The USR-WIFI232-B2 web management page support English and Chinese language. User can
select language environment at the top right corner and click “Apply” button.
The main menu include five pages: “Mode Selection”,” AP Interface Setting”,”STA Interface
Setting”,”Application Setting”, “WEB IO”and “Device Management”
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4.12.2 Quick Configure
This page provides users with a method of rapid configuration module.Users according to the
steps to configure the parameters and restart the module page, you can let the module is normal
work, reduced the configuration steps and time.Of course the options on this page is less, if some
detailed configuration, still need to the corresponding configuration page.
Figure 27
Quick Configure Page
This page has four configuration options and a restart, the corresponding instructions below:
 WI-FI Setting: set the working mode of wifi, AP mode or the STA.
 Ethernet Ports Setting: open/close the Ethernet ports, and set up the corresponding work
mode.
 UART Setting: set serial port parameters, including baud rate, parity bit, 485 functions and so
on.
 Network Setting: set network parameters, Only TCPA related parameters.
 Device Management: when after completion of the above parameters are configured, click
reset module.
4.12.3 Mode Selection Page
This page use to setting the wireless networking mode (AP and STA mode).
"Data transmission mode" selection module working mode are "Transparent Mode", "Serial Command
mode", "HTTPD Client mode", "GPIO mode".
"TCP connection password authentication" can choose whether open TCP password authentication.
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Mode Selection Page
Figure 28
4.12.4 AP Interface Setting Page
This page use to setting the parameters when USR-WIFI232-A/B/C module works as AP.
Figure 29
AP Interface Setting Page
4.12.5 STA Interface Setting Page
This page use to setting the parameters when USR-WIFI232-B2 module works as STA.
Such as SSID of AP which module need to connected, and also select the networking type: DHCP or
static IP address.
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Figure 30
http://www.usriot.com
STA Interface Setting Page
4.12.6 Application Setting Page
This page use to setting the parameters of serial port communication, such as UART
setting,UART AutoFrame Setting,Ethernet function,Device ID setting and high layer network
protocol setting which used support serial communication.
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Figure 31
http://www.usriot.com
Application Setting Page
Notes:
Generally, Network protocols support three modes: TCP Server, TCP Client, UDP Client,UDP
Server.
Besides module working as TCP Server (IP address not required in this mode). User must set the
IP address of the device which need communicate with USR-WIFI232-B2 module.
Also the Port ID between two sides of the communication devices must keep the same.
4.12.7 Ethernet Setting
This page is used to set Ethernet front-end ports of the module, It can be open or closed.And
also can be set to the WAN port to use, this module can be used as a secondary router, making it
easy for users to network.Specific Settings page is as follows:
Figure 32
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4.12.8 HTTPD Client Mode
This page sets the HTTP header in the HTTPD Client mode.Include: the address of the server,
the server port, request type, protocol header path, Connection, user-agent.
HTTPD Client mode support POST, PUT, GET three HTTP request types.Is a POST or PUT
request way, serial data can be added to the back of the HTTP header;When the request is a
GET, data can be added to the back of the path in the HTTP header.The specific way of sending
data can consult section 4.2.4.
Figure 33
HTTPD Client Mode Page
4.12.9 WEB IO
Figure 34
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Advanced Page
Under the advanced Settings page, the user can set the port mapping and function of DDNS,
without having to go on a router Settings, reduce the complexity of setting, the port mapping and
DDNS, can be in the public environment, by entering the peanut shell domain name and port, can
quickly and easily find the module.
Figure 35
4.12.11
Advanced Setting Page
Device Management Page
This page use to manage USR-WIFI232-A/B/C module general setting, such as administrator setting,
restart module button, restore factory default setting button, and update firmware through webpage.
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Figure 36
http://www.usriot.com
Device Management Page
Notes: Restart module button: When you setting the parameters of different web pages,
you will click “Apply” button to confirm the setting, but the setting take effect only after
user click the “Restart” button here, the module will re-boot up and refresh the memory
information with new changes.
4.13
AT command Introduction
4.13.1 Configuration Mode
When USR-WIFI232-B2 power up, it will default works as transparent transmission mode, then
user can switch to configuration mode by serial port command. USR-WIFI232-B2 UART default
parameters setting as below figure
Figure 37
USR-WIFI232-B2 Default UART Port Parameters
In configuration mode, user can setting the module through AT+ instruction set, which cover all
web page setting function.
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4.13.1.1 Switch to Configuration Mode
Two steps to finish switching from transparent transmission mode to configuration mode.

UART input “+++”, after module receive “+++”, and feedback “a” as confirmation.

UART input “a”, after module receive “a” and feedback “+ok” to go into AT+
instruction set configuration mode.
Figure 38
Switch to Configuration Mode
Notes:
1. When user input “+++” (No “Enter” key required), the UART port will display feedback
information “a”, and not display input information”+++” as above UART display.
2. Any other input or wro ng step to UART port will cause the module still works as original mode
(transparent transmission).
4.13.2 AT+ Instruction Set Overview
User can input AT+ Instruction through hyper terminal or other serial debug terminal, also can
program the AT+ Instruction to script. User can also input “AT+H” to list all AT+ Instruction and
description to start.
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Figure 39
http://www.usriot.com
”AT+H” Instruction for Help
We supply software USR-WIFI232-Setup to send command easily, software setup:
Figure 40
Serial port parameter
Click “Open Com”, send “+++a”, it will reply +ok in left side, then type in and send the command
you need to send, then click “AT+RELD” to restore, then parameters saved.
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Figure 41
http://www.usriot.com
software of USR-WIFI232-Setup
Above is by COM, also you can send by WIFI:
First, connect with PC, open the software, see Net part
Figure 42
Search module
Click search, then will show module, click module then you can send command.
4.13.2.1 Instruction Syntax Format
AT+Instruction protocol is based on the instruction of ASCII command style, the description of
syntax format as follow.
 Format Description


< >: Means the parts must be included
[ ]: Means the optional part

Command Message
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AT+[op][para-1,para-2,para-3,para-4…]
AT+: Prefix of command message;
CMD: Command string;
[op]: Symbol of command operator,
 “=” : The command requires parameters input;
 “NULL”: Query the current command parameters setting;

[para-n]: Parameters input for setting if required;
: ”Enter” Key, it’s 0x0a or 0x0d in ASCII;



Notes: When input AT+Instruction, “AT+” character will display capital letter automatic
and other parts will not change as you input.

Response Message
+[op] [para-1,para-2,para-3,para-4…]


+: Prefix of response message;

RSP: Response string;

“ok” : Success

“ERR”: Failure

[op] : =

[para-n]: Parameters if query command or Error code when error happened;

: ASCII 0x0d;

: ASCIII 0x0a;
Error Code
Table 8 Error Code Description USR-WIFI232-A/B/C Web Access Default Setting
Error Code
Description
-1
Invalid Command Format
-2
Invalid Command
-3
Invalid Operation Symbol
-4
Invalid Parameter
-5
Operation Not Permitted
4.13.2.2 AT+ command Set
Instruction

ENTM
NETP
UART
UARTF
UARTFT
Table 9 AT+ command Set List
Description
NULL
Open/Close show back function
Set module into transparent transmission mode
Set/Query network protocol parameters
Set/Query serial port parameters
Open/Close UART auto-frame function
Set/Query UART auto-frame trigger time
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UARTFL
TMODE
WMODE
WSKEY
WSSSID
WSLK
WEBU
WAP
WAKEY
HIDESSID
MSLP
WSCAN
TCPLK
TCPDIS
WANN
LANN
DHCPDEN
DHCPGW
TCPTO
MAXSK
TCPB
TCPPTB
TCPADDB
TCPTOB
TCPLKB
EPHY
STTC
DOMAIN
RELD
FUDLX
MMID
IDFIR
IDEVE
AABR
MID
VER
WSSSIDA
WSSSIDB
WSSSIDC
WSKEYA
WSKEYB
WSKEYC
WSQY
HTPMODE
HTPSV
HTPTP
HTPURL
HTPHEAD
http://www.usriot.com
Set/Query UART auto-frame trigger length
Set/Query data transmission mode
(transparent transmission or agreement transmission)
Set/Query WIFI work mode (AP or STA)
Set/Query WIFI security parameters as STA
Set/Query WIFI target AP SSID parameters as STA
Query WiFi link status as STA
Set/Query WEB page login parameters
(User Name and Password)
Set/Query WIFI parameters as AP
Set/Query WIFI security parameters as AP
Set/Query hide AP’s SSID
Set modules into power save mode.(Turn OFF WiFi)
Seek AP when module works as STA mode
Query if TCP link already build-up
Open/Cose TCP (Only TCP Client available)
Set/Query WAN setting, only effective as STA mode
Set/Query LAN setting, only effective as AP mode
Enable/Disable LAN DHCP server function
Set/Query DHCP gateway address
Set/Query TCP timeout
Set/Query maxima TCP connection
Open/Close TCPB function
Set/Query TCPB port number
Set/Query TCPB server address
Set/Query TCPB time out time
Query TCPB link status
Open/Close ETH interface
Enable/Disable STA port scan function
Set/Query domain of module webpage
Restore to factory default setting
Open / close the 485 function
Device ID
Send an ID when module connection is established
Every time to send data to send ID
Open / close baud rate adaptive function
Query module ID information
Query module software version information
Help
Set/query the first AP‘s ssid of 3 sta parameters settings
Set/query the second AP‘s ssid of 3 sta parameters settings
Set/query the third AP‘s ssid of 3 sta parameters settings
Set/query the first AP‘s password of 3 sta parameters settings
Set/query the second AP‘s password of 3 sta parameters settings
Set/query the third AP‘s password of 3 sta parameters settings
Set/query the critiacl value of network switching
The switch of new/old HTTP headers setting mode(HTTPD Client)
Under the new mode,Settings/query server and IP address(HTTPD
Client)
Under the new mode,Settings/query request type(HTTPD Client)
Under the new mode,setting/query request path(HTTPD Client)
Under the new mode,Settings/query the HTTP header(HTTPD
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Client)
Settings/query Registered Package Type
Settings/query Upload Manner
Settings/query Device ID
REGEN
REGTCP
REGID
Notes: USR-WIFI232-B2 module can works as AP or STA, user have to use different AT+ Instruction
to set WiFi parameters when module works as AP or STA mode.
4.13.2.2.1
AT+E

Function: Open/Close show back function;

Format:
AT+E
+ok< LF >< LF >
When USR-WIFI232-A/B/C module firstly switch from transparent transmission to configuration mode,
show back status is open, input “AT+E” to close show back function, input“AT+E” again to open show
back function.
4.13.2.2.2
AT+ENTM

Function: Set module into transparent transmission mode;

Format:
AT+ENTM
+ok< LF >< LF >
When operate this command, module switch from configuration mode to transparent transmission
mode.
4.13.2.2.3
AT+NETP

Function: Set/Query network protocol parameters;

Format:

Query Operation
AT+NETP
+ok=< LF >< LF >

Set Operation
AT+NETP=
+ok< LF >< LF >

Parameters:



protocol:

TCP

UDP
CS: Network mode:

SERVER

CLIENT
Port: protocol port ID: Decimal digit and less than 65535
Note: When it is Tcp and Udp Server, the Port can not be 80 (HTTP port), 8000 (websocket port),
49000 (usr - link port).
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
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IP: Server’s IP address when module set as client
After USR-WIFI232-B2 module boots up again, the setting will be effective.
4.13.2.2.4
AT+UART

Function: Set/Query serial port parameters;

Format:

Query Operation
AT+UART
+ok=< LF >< LF >

Set Operation
AT+UART=
+ok< LF >< LF >

Parameters:

baudrate:

300,600,1200,1800,2400,4800,9600,19200,38400,57600,115200,230400,345
600,460800

data_bits:


stop_bits:


1,2
parity:


5,6,7,8
NONE,EVEN,ODD,MARK,SPACE
flowctrl：hardware flow control (CTSRTS)

NFC: No flow control

FC: flow control
After USR-WIFI232-B2 module boots up again, the setting will be effective.
4.13.2.2.5
AT+UARTF

Function: Open/Close UART auto-frame function;

Format:

Query Operation
AT+ UARTF
+ok=< LF >< LF >

Set Operation
AT+ UARTF=
+ok< LF >< LF >

Parameters:

4.13.2.2.6
para:

disable
- Close auto-frame function;

enable
- Open auto-frame function;
AT+UARTFT

Function: Set/Query UART auto-frame trigger time;

Format:

Query Operation
AT+ UARTFT
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