High Flying Electronics Technology HF-A21-SMT Embedded Wi-Fi Module User Manual

High-Flying Electronics Technology Co., Ltd. Embedded Wi-Fi Module

User manual

HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 1 HF-A21-SMT Embedded WiFi Module User Manual V1.1 Overview of Characteristic  Support IEEE802.11b/g/n Wireless Standards  Support TCP/UDP/HTTP Network Protocols  Support UART/Ethernet Data Interface  Support Work As STA/AP/AP+STA Mode  Support Router/Bridge Mode Networking  Support AT+ Instruction Set for Configuration  Support Friendly Web Configuration Page  Support Palmodic Signal  Support Smart Link Application Tools  Support UART Free/Auto-Frame Function  Single +3.3V Power Supply  Small Size: 25 x 40mm  FCC/CE Certificated
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 2 FCC STATEMENT : This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. Warning: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:  Reorient or relocate the receiving antenna.  Increase the separation between the equipment and receiver.  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.  Consult the dealer or an experienced radio/TV technician for help. FCC Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 3 TABLE OF CONTENTS 1. PRODUCT OVERVIEW ............................................................................................................... 9 1.1. General Specification ............................................................................................................. 9 1.2. Hardware Introduction .......................................................................................................... 10 1.2.1. Pins Definition .................................................................................................................. 10 1.2.2. Mechanical Size ............................................................................................................... 12 1.2.3. On-board Chip Antenna ................................................................................................... 12 1.2.4. Evaluation Kit ................................................................................................................... 14 1.2.5. Order Information ............................................................................................................. 15 1.3. Hardware Reference Design ................................................................................................ 15 1.3.1. Hardware Typical Application .......................................................................................... 15 1.3.2. 10/100M Ethernet Interface ............................................................................................. 16 1.3.2.1. Ethernet Connection with Transformer ........................................................................ 16 1.3.2.2. Ethernet Connection without Transformer ................................................................... 16 1.3.3. UART Interface ................................................................................................................ 17 1.3.4. Power Interface ................................................................................................................ 17 1.4. Software Reference Design.................................................................................................. 18 1.4.1. Transparent Transmission Mode ..................................................................................... 18 1.4.2. Configuration Mode .......................................................................................................... 18 1.4.3. Multi-TCP Link Connection .............................................................................................. 19 1.4.4. TCPB Function ................................................................................................................. 19 1.4.5. Palmodic Signal ............................................................................................................... 19 2. FUNCTIONAL DESCRIPTION ................................................................................................. 21 2.1. Wireless Networking ............................................................................................................. 21 2.1.1. Basic Wireless Network Based On AP (Infrastructure) ................................................... 21 2.1.2. Wireless Network Based On AP Network ........................................................................ 21 2.1.3. Wireless Network Based On AP+STA ............................................................................. 22 2.2. Auto- Frequency Function ................................................................................................... 23 2.3. Security .................................................................................................................................. 23 2.4. UART Frame Scheme ............................................................................................................ 23 2.4.1. UART Free-Frame ........................................................................................................... 23 2.4.2. UART Auto-Frame ........................................................................................................... 24 2.5. Address Binding ................................................................................................................... 24 2.6. Ethernet Interface Communication ..................................................................................... 24 2.6.1. HF-A21-SMT Ethernet Interface Networking (As AP) ..................................................... 24 2.6.2. HF-A21-SMT Ethernet Interface Networking (As STA, N-Ver) ........................................ 25 2.6.3. HF-A21-SMT Ethernet Interface Networking (As STA, Z-Ver) ........................................ 25 2.7. Search Function for STA ...................................................................................................... 25 2.8. Work Mode ............................................................................................................................. 25 2.9. Network Protocol .................................................................................................................. 26 2.10. Parameters Configuration ................................................................................................ 26 2.11. Firmware Upgrade ............................................................................................................. 27 3. OPERATION GUIDELINE ......................................................................................................... 28 3.1. Configuration via Web Accessing ....................................................................................... 28 3.1.1. Open Web Management Interface ................................................................................... 28
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 4 3.1.2. Mode Selection Page ....................................................................................................... 29 3.1.3. AP Interface Setting Page ............................................................................................... 29 3.1.4. STA Interface Setting Page ............................................................................................. 29 3.1.5. Application Setting Page .................................................................................................. 30 3.1.6. Device Management Page .............................................................................................. 31 3.2. HF-A21-SMT Usage Introduction ......................................................................................... 31 3.2.1. Software Debug Tools ..................................................................................................... 31 3.2.2. Network Connection ......................................................................................................... 31 3.2.3. Module Debug .................................................................................................................. 32 3.3. Typical Application Examples ............................................................................................. 34 3.3.1. Wireless Control Application ............................................................................................ 34 3.3.2. Remote Management Application .................................................................................... 35 3.3.3. Transparent Serial Port Application ................................................................................. 35 3.3.4. Wireless Data Acquisition Card Application..................................................................... 36 4. AT+INSTRUCTION INTRODUCTION ...................................................................................... 37 4.1. Configuration Mode .............................................................................................................. 37 4.1.1. Switch to Configuration Mode .......................................................................................... 37 4.2. AT+ Instruction Set Overview .............................................................................................. 38 4.2.1. Instruction Syntax Format ................................................................................................ 38 4.2.2. AT+ Instruction Set .......................................................................................................... 39 4.2.2.1. AT+E ............................................................................................................................ 40 4.2.2.2. AT+ENTM ..................................................................................................................... 40 4.2.2.3. AT+NETP ..................................................................................................................... 40 4.2.2.4. AT+UART ..................................................................................................................... 41 4.2.2.5. AT+ UARTF .................................................................................................................. 41 4.2.2.6. AT+ UARTFT................................................................................................................ 42 4.2.2.7. AT+ UARTFL ................................................................................................................ 42 4.2.2.8. AT+TMODE .................................................................................................................. 42 4.2.2.9. AT+WMODE................................................................................................................. 42 4.2.2.10. AT+WSKEY .............................................................................................................. 43 4.2.2.11. AT+WSSSID ............................................................................................................. 43 4.2.2.12. AT+ WSLK ................................................................................................................ 43 4.2.2.13. AT+WEBU ................................................................................................................ 44 4.2.2.14. AT+WAP ................................................................................................................... 44 4.2.2.15. AT+WAKEY .............................................................................................................. 44 4.2.2.16. AT+HIDESSID .......................................................................................................... 45 4.2.2.17. AT+MSLP ................................................................................................................. 45 4.2.2.18. AT+WSCAN .............................................................................................................. 45 4.2.2.19. AT+ TCPLK .............................................................................................................. 45 4.2.2.20. AT + TCPDIS ............................................................................................................ 46 4.2.2.21. AT+ WANN ............................................................................................................... 46 4.2.2.22. AT+ LANN ................................................................................................................ 46 4.2.2.23. AT + DHCPDEN ....................................................................................................... 47 4.2.2.24. AT+ DHCPGW .......................................................................................................... 47 4.2.2.25. AT+ TCPTO .............................................................................................................. 47 4.2.2.26. AT+ MAXSK ............................................................................................................. 47 4.2.2.27. AT+TCPB.................................................................................................................. 48 4.2.2.28. AT+TCPPTB ............................................................................................................. 48 4.2.2.29. AT+TCPADDB .......................................................................................................... 48
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 5 4.2.2.30. AT+TCPTOB ............................................................................................................ 48 4.2.2.31. AT+TCPLKB ............................................................................................................. 49 4.2.2.32. AT+EPHY ................................................................................................................. 49 4.2.2.33. AT+STTC .................................................................................................................. 49 4.2.2.34. AT+DOMAIN ............................................................................................................. 49 4.2.2.35. AT+FRLDEN ............................................................................................................. 49 4.2.2.36. AT+RELD.................................................................................................................. 50 4.2.2.37. AT+Z ......................................................................................................................... 50 4.2.2.38. AT+MID..................................................................................................................... 50 4.2.2.39. AT+WRMID .............................................................................................................. 50 4.2.2.40. AT+VER .................................................................................................................... 50 4.2.2.41. AT+H ......................................................................................................................... 50 4.2.2.42. AT+FVEW ................................................................................................................. 51 4.2.2.43. AT+FVER.................................................................................................................. 51 4.2.2.44. AT+WMAC ................................................................................................................ 51 4.2.2.45. AT+PING .................................................................................................................. 51 5. PACKAGE INFORMATION ....................................................................................................... 53 5.1 Shipping Information ............................................................................................................ 53 APPENDIX A: QUESTIONS AND ANSWERS ............................................................................... 54 Q1: How to configure transparent serial port application (TCP protocol) with two HF-A21-SMT modules? ......................................................................................................................... 54 Q2: Where to Set HF-A21-SMT Module LAN IP and WAN IP through Web Page？ .................. 54 Q3: How to configure transparent serial port application (UDP protocol) with two HF-A21-SMT modules? ......................................................................................................................... 55 Q4: Where to set HF-A21-SMT module network protocol (TCP/UDP)? ...................................... 55 Q5: How to configure transparent serial port application: Two HF-A21-SMT modules all configured as STA and connection through AP? ........................................................................ 56 Q6: How to avoid IP address confliction when apply HF-A21-SMT module? ........................... 57 Q7: PC works as server, all HF-A21-SMT modules works as data acquisition card and connect with PC, how to configure this application? .................................................................. 57 APPENDIX B: EVB REFERENCE DESIGN ................................................................................... 59 APPENDIX C: CONTACT INFORMATION ..................................................................................... 60
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 6 LIST OF FIGURES Figure 1. HF-A21-SMT Appearance ................................................................................................... 10 Figure 2. HF-A21-SMT Pins Map ....................................................................................................... 10 Figure 3. HF-A21-SMT Mechanical Dimension .................................................................................. 12 Figure 4. HF-A21-SMT Chip Antenna Keep Out Region .................................................................... 12 Figure 5. Suggested Module Placement Region ................................................................................ 13 Figure 6. HF-A21-SMT Evaluation Kit ................................................................................................ 14 Figure 7. HF-A21-SMT Order Information .......................................................................................... 15 Figure 8. HF-A21-SMT Hardware Typical Application........................................................................ 15 Figure 9. Ethernet Reference Design with Transformer ..................................................................... 16 Figure 10. Ethernet Reference Design without Transformer ............................................................ 17 Figure 11. UART Interface Reference Design .................................................................................. 17 Figure 12. User MCU Software Flow Chart ...................................................................................... 18 Figure 13. Multi-TCP Link Data Transmition Structure ..................................................................... 19 Figure 14. HF-A21-SMT Functional Architecture .............................................................................. 21 Figure 15. HF-A21-SMT Basic Wireless Network Structure ............................................................. 21 Figure 16. HF-A21-SMT AP Network Structure ................................................................................ 22 Figure 17. HF-A21-SMT AP+STA Network Structure ....................................................................... 22 Figure 18. HF-A21-SMT Ethernet Interface Networking (As AP) ..................................................... 24 Figure 19. HF-A21-SMT Ethernet Interface Networking (As STA, N-Ver) ........................................ 25 Figure 20. HF-A21-SMT Ethernet Interface Networking (As STA, Z-Ver) ........................................ 25 Figure 21. HF-A21-SMT Transparent Transmission Demo .............................................................. 26 Figure 22. Open Web Management page ......................................................................................... 28 Figure 23. Mode Selection Page ....................................................................................................... 29 Figure 24. AP Interface Setting Page ............................................................................................... 29 Figure 25. STA Interface Setting Page ............................................................................................. 30 Figure 26. Application Setting Page .................................................................................................. 30 Figure 27. Device Management Page .............................................................................................. 31 Figure 28. STA Interface Debug Connection .................................................................................... 32 Figure 29. AP Interface Debug Connection ...................................................................................... 32 Figure 30. “CommTools” Serial Debug Tools ................................................................................... 32 Figure 31. “TCPUDPDbg” Tools Create Connection ........................................................................ 33 Figure 32. “TCPUDPDbg” Tools Setting ........................................................................................... 33 Figure 33. “TCPUDPDbg” Tools Connection .................................................................................... 34 Figure 34. Wireless Control Application ............................................................................................ 34 Figure 35. Remote Management Application .................................................................................... 35 Figure 36. Transparent Serial Port Application ................................................................................. 35 Figure 37. Wireless Data Acquisition Card Application..................................................................... 36 Figure 38. HF-A21-SMT Default UART Port Parameters ................................................................. 37 Figure 39. Switch to Configuration Mode .......................................................................................... 37 Figure 40. ”AT+H” Instruction for Help .............................................................................................. 38 Figure 41. Shipping Information ........................................................................................................ 53 Figure 42. Configure Transparent Serial Port Connection (TCP) ..................................................... 54 Figure 43. Module LAN IP Setting..................................................................................................... 55 Figure 44. Module WAN IP Setting ................................................................................................... 55 Figure 45. Configure Transparent Serial Port Connection (UDP) ..................................................... 55 Figure 46. Module Network Protocols: TCP/Server .......................................................................... 56 Figure 47. Module Network Protocol: TCP/Client ............................................................................. 56
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 7 Figure 48. Module Network Protocol: UDP ....................................................................................... 56 Figure 49. Two HF-A21-SMT Modules Connection Through AP ...................................................... 57 Figure 50. Wireless Data Acquisition Card Setting ........................................................................... 58 LIST OF TABLES Table 1 HF-A21-SMT Module Technical Specifications ...................................................................... 9 Table 2 HF-A21-SMT Pins Definition ................................................................................................ 10 Table 3 HF-A21-SMT Evaluation Kit Interface Description ............................................................... 14 Table 4 HF-A21-SMT Web Access Default Setting ........................................................................... 28 Table 5 Error Code DescribtionHF-A21-SMT Web Access Default Setting ...................................... 39 Table 6 AT+ Instruction Set List ........................................................................................................ 39
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 8 HISTORY Ed. V1.0 Created on 1-14-2015. Ed. V1.1 Modified on 2-03-2015. Modify power consumption.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 9 1. PRODUCT OVERVIEW 1.1. General Specification Table 1 HF-A21-SMT Module Technical Specifications Class Item Parameters Wireless Parameters Certification FCC/CE Wireless standard 802.11 b/g/n Frequency range 2.412GHz-2.462GHz 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 Internal:On-board PCB antenna Hardware Parameters Data Interface UART: 1200bps - 230400bps Ethernet: 10Mbps/100Mpbs GPIO,I2C,USB Operating Voltage 3.3V (+/-5%) Operating Current Avg:170mA Peak:400mA Operating Temperature -40℃- 85℃ Storage Temperature -45℃- 125℃ Dimensions and Size 25×40×3mm SMT Software Parameters Network Type STA /AP/AP+STA mode Security Mechanisms WEP/WPA-PSK/WPA2-PSK/WAPI Encryption WEP64/WEP128/TKIP/AES Work Mode Transparent Transmission Serial command AT+instruction set Network Protocol TCP/UDP/ARP/ICMP/DHCP/DNS/HTTP Max. TCP Connection 32 User Configuration Web Server＋AT command config. User Application SW Support customized application SW Provide SDK package Provide smart link tools
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 10 1.2. Hardware Introduction 1.2.1. Pins Definition Figure 1. HF-A21-SMT Pins Map Table 2 HF-A21-SMT Pins Definition Pin Description Name Direction Note 3,18,24, 26 GND GND Power 1,2 VCC 3.3V Power 3.3V @ 350mA 4 UART Data Transmit UART_TXD O Note1
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 11 5 UART Data Receive UART_RXD I 6 GPIO GPIO_0 I/O c 8 Ethernet Interface PHY_TX+ O Ethernet Data Interface. 9 Ethernet Interface PHY_TX- O 10 Ethernet Interface PHY_RX+ I 11 Ethernet Interface PHY_RX- I 12 USB_D+ USB_D+ I/O USB Host Port 13 USB_D- USB_D- I/O 14 WiFi status Indication nLink O “1”- WIFI connection available, “0”- 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” or “Palmodic Signal” - 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 3s, then set “1”. This pin must 4.7K pull-up outside the module. 19 I2C_SD I2C_SD I/O 20 I2C_SCLK I2C_SCLK O 21 UART1 Data Receive UART1_RXD I 22 UART1 Data Transmit UART1_TXD O Note1 23 GPIO GPIO_1 I/O 25 2.4GHz Antenna ANT O 50 Ohm resistence control 7 Reserved NC NC
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 12 1.2.2. Mechanical Size HF-A21-SMT modules physical size as follows: Figure 3. HF-A21-SMT Mechanical Dimension 1.2.3. On-board Chip Antenna HF-A21-SMT module support internal ob-board chip antenna option. When costomer select internal antenna, you shall comply with following antenna design rules and module location suggestions:  For customer PCB, RED color region (7.5x25mm) can‟t put componet or paste GND net;  Antenna must away from metal or high components at least 10mm;  Antenna can‟t be shieldedby any meal enclosure; All cover, include plastic, shall away from antenna at least 10mm; Figure 4. HF-A21-SMT Chip Antenna Keep Out Region High-Flying suggest HF-A21-SMT module better locate in following region at customer board, which to reduce the effect to antenna and wireless signal, and better consult High-Flying technical people when you structure your module placement and PCB layout.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 13 Figure 5. Suggested Module Placement Region
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 14 1.2.4. Evaluation Kit High-Flying 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 HF-A21-SMT 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 6. HF-A21-SMT Evaluation Kit Table 3 HF-A21-SMT Evaluation Kit Interface Description Function Name Description External Interface DC-Jack 5V@1A Power input: DC-Jack DC 5V 5V@1A Power input: 2-Pin COM1 UART DB9, UART, Connect PC serial port COM2 UART1 DB9, UART1, Connect PC serial port RJ-45 100M Ethernet Interface USB Host Seserved USB (Type A) DIP-16 Extended 16-pin functional interface LED Power (Red) 3.3V Power Indicator nLink nLink/GPIO-Pin 14 Indicator nReady nReady/GPIO-Pin 16 Indicator Button Reset Used to reset the module. Reload Module restore to factory default configuration.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 15 1.2.5. Order Information Base on customer detailed requirement, HF-A21-SMT series modules provide different variants and physical type for detailed application. Figure 7. HF-A21-SMT Order Information 1.3. Hardware Reference Design 1.3.1. Hardware Typical Application Figure 8. HF-A21-SMT Hardware Typical Application Notes： nRST- Module hardware reset signal. Input. Logics “0” effective.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 16 There is 22K&4.7uF reset circuit. 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. 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. 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. UART_TXD/RXD- UART port data transmit and receive signal. 1.3.2. 10/100M Ethernet Interface HF-A21-SMT 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. 1.3.2.1. 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: Figure 9. Ethernet Reference Design with Transformer 1.3.2.2. Ethernet Connection without Transformer For this application, Ethernet will work as internal data transmition interface and save one transformer and RJ-45 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.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 17 Figure 10. Ethernet Reference Design without Transformer 1.3.3. UART Interface UART interface is the serial data transmition interface mainly used for HF-A21-SMT modules. User can add RS-232 chipset on user board and convert the signal to RS-232 voltage to communicate with outside equipment or sensors. HF-A21-SMT modules UART interface include 4 general signals: TXD/RXD/RTS/CTS. The hardware reference design with RS-232 chipset as following: Figure 11. UART Interface Reference Design Notes: TXD pin is also hardware configuration pin internal module. So this pin MUST pull-down during module power up. HF0A11x 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. 1.3.4. Power Interface HF-A21-SMT 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.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 18 1.4. Software Reference Design When HF-A21-SMT modules boot up phase, the general user board MCU software flow chart will as following: Figure 12. User MCU Software Flow Chart When HF-A21-SMT modules boot up, user can select one work mode base on the setting, and user can switch to the configuration mode at any kinds of work mode. 1.4.1. Transparent Transmission Mode HF-A21-SMT 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: Transparent transmission mode as a low level phy layer data transmitting can't keep zero error rates by itself. User can enable UART port‟s hardware flow control CTS/RTS function or though higher layer protocol such as TCP to lower error rate and mange the data completeness. High-Flying recommend when doing large amounts of data transmitting in transparent transmission mode, hardware flow control should be enabled, so as to fully ensure reliable data transmission. In the applications which doesn‟t need flow control, users can simply leave RTS / CTS pin vacant. 1.4.2. Configuration Mode In configuration mode, user can finish HF-A21-SMT module configuration management and parameters setting work. In work mode (Transparent Transmission), user can switch to the
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 19 configuration mode through AT+instruction, detailed switch operation refer to “AT+ instruction set” chapter. 1.4.3. Multi-TCP Link Connection When HF-A21-SMT module configured as TCP Server, it supports Multi-TCP link connection, and maximum 32 TCP clients permit to connect to HF-A21-SMT module. User can realize multi-TCP link connection at each work mode. 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 13. Multi-TCP Link Data Transmition Structure 1.4.4. TCPB Function HF-A21-SMT support 2xTCP function, which means module can support 2 network connections at the same time. The 2nd net work connection called TCPB. TCPB only works as TCP Client and its configuration can only through AT commanrd, not Web configuration supported. The command as following,  AT+TCPB=on, Enable TCPB function;  AT+TCPPTB=<port>, Set TCPB port number;  AT+TCPADDB=<IP or domain>, Set TCPB‟s server address;  AT+TCPTOB=<time>, Set TCPB timeout;  AT+TCPLKB, Query TCPB link status; Detailed command describtion refer ro AT instruction chapter. After enable TCPB function, two network interfaces‟ work mode like “Multi-TCP Link”, All dates from each TCP connection will be transmitted to the serial port as a sequence and all data from serial port (user) will be duplicate and broadcast to each TCP connection. 1.4.5. 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:
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 20 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 Hi-flying for more detailed support.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 21 2. FUNCTIONAL DESCRIPTION 2.1. Wireless Networking HF-A21-SMT module can be configured as both wireless STA and AP base on network type. Logically there are two interfaces in HF-A21-SMT. One is for STA, and another is for AP. When HF-A21-SMT works as AP, other STA equipments are able to connect to wireless LAN via HF-A21-SMT module. Wireless Networking with HF-A21-SMT is very flexible. Following figure shows the functional architecture of HF-A21-SMT module: Figure 14. HF-A21-SMT Functional Architecture Notes: AP: that is the wireless Access Point, the founder of a wireless network and the centre 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. 2.1.1. Basic Wireless Network Based On AP (Infrastructure) 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 centre, and all communication between STAs is transmitted through the AP. The figure following shows such type of networking. Figure 15. HF-A21-SMT Basic Wireless Network Structure 2.1.2. Wireless Network Based On AP Network
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 22 As showing in the figure below, HF-A21-SMT (1) can be treat as an AP, and HF-A21-SMT (2), HF-A21-SMT (3) and the laptop are STAs connected to HF-A21-SMT (1). Meanwhile, all HF-A21-SMT modules can connected to user device via UART interface. All HF-A21-SMT modules can be operated and managed through the laptop. So it is convenient to O&M all HF-A21-SMT modules. Moreover, in such AP network structure, the whole coverage of a wireless network can be extended easily. Figure 16. HF-A21-SMT AP Network Structure 2.1.3. Wireless Network Based On AP+STA HF-A21-SMT module support AP+STA network mode, means module support one AP interface and one STA interface at the same time, as following figure, Figure 17. HF-A21-SMT AP+STA Network Structure
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 23 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: 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 AP+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 data 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-starting the module; 2.2. Auto- Frequency Function When module works as STA, HF-A21-SMT will adjust its wireless channel to keep the same channel with associated AP and connect in. When module works as AP and HF-A21-SMT enable Auto-frequency function, then when module boot up, it will select the best wireless channel based on surrounding environment. 2.3. Security HF-A21-SMT module supports multiple wireless encryption mechanisms, and enables to protect the security of user‟s data transmission, the mechanisms include:  WEP  WPA-PSK/TKIP  WPA-PSK/AES  WPA2-PSK/TKIP  WPA2-PSK/AES 2.4. UART Frame Scheme 2.4.1. UART Free-Frame HF-A21-SMT support UART free-frame function. If user select open this function, module will check the intervals between any two bytes when reciving UART data. If this interval time exceeds defined value (50ms default), HF-A21-SMT will think it as the end of one frame and transfer this free-frame to WiFi port, or HF-A21-SMT will receive UART data untill 4K bytes, then transfer 4KB frame to WiFi port.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 24 HF-A21-SMT‟s 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=fash/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. 2.4.2. UART Auto-Frame HF-A21-SMT 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 auto-frame 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. 2.5. Address Binding HF-A21-SMT 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. Users can prevent STA from joining to illegal network by binding the BSSID address, to improve wireless network security. 2.6. Ethernet Interface Communication HF-A21-SMT module provides one 10/100M Ethernet interface. With this Ethernet interface, user can easily realize the three interface (WiFi, UART, and Ethernet) intercommunication and networking. HF-A21-SMT module can configured as Bridge Mode or Router Mode base on different networking technology. Notes: The Ethenet function is disabled by default because of the large power consumption. Users may input “AT+FEPHY=on” and reset to enable Ethenet. HF-A21-SMT need different configuration to support different Ethenet Networking mode (Such as “N-Ver” and “Z-Ver” as following, which need AT+FVER=n to switch to N-Ver or AT+FVER=z to switch to Z-Ver). 2.6.1. HF-A21-SMT Ethernet Interface Networking (As AP) Figure 18. HF-A21-SMT Ethernet Interface Networking (As AP)
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 25 For above networking, HF-A21-SMT module works as AP and also the centre of this network. All devices‟ IP address in this network shall use the same network segment with HF-A21-SMT and they can intercommunication with this method. 2.6.2. HF-A21-SMT Ethernet Interface Networking (As STA, N-Ver) Figure 19. HF-A21-SMT Ethernet Interface Networking (As STA, N-Ver) For above networking, HF-A21-SMT module works as STA（Firmware is N-Version）,and module configured 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 for above networking, PC1 at internal subnet can initiate a connection to PC2 (For HF-A21-SMT works as router mode), but PC2 can‟t active initiate a connection to PC1. 2.6.3. HF-A21-SMT Ethernet Interface Networking (As STA, Z-Ver) Figure 20. HF-A21-SMT Ethernet Interface Networking (As STA, Z-Ver) For above networking, HF-A21-SMT 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, HF-A21-SMT 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. 2.7. 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. 2.8. Work Mode HF-A21-SMT modules provide two kinds of work mode: Transparent transmission mode. Transparent transmission mode achieves a plug and play serial data port, and reduces user
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 26 complexity. User can save the configuration information to the flash of HF-A21-SMT, then module will go into the appointed work mode after power up. For a module which already finished parameters setting, it will try to connect a wireless network and server with these parameters after power up, and serial interface is also active with pre-configured parameters. Then all the data is transferred directly between serial interface and Wifi interface without any interpreted. The parameters which need to configure include:  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  Work Mode Selection  Transparent transmission Transparent transmission demo as showing in the following figure, a HF-A21-SMT module can be taken as a virtual serial line when UART interface working in transparent transmission mode. And user device will realize wireless data transmition almost without any changes. Figure 21. HF-A21-SMT Transparent Transmission Demo 2.9. Network Protocol HF-A21-SMT module supports TCP/UDP network protocol and the port parameters can be set via web accessing or AT+instruction set. 2.10. Parameters Configuration HF-A21-SMT module supports two methods to configuration parameters: Web Accessing and AT+instruction set. Web accessing means users can configure parameters through Web browser. When HF-A21-SMT module connected to wireless network, parameters configuration is done on a PC
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 27 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: High-Flying can customized the parameters setting as customer request and ship HF-A21-SMT 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, High-Flying can provide the auto-configuration tool to speed up the module conguration duration. Please contact High-Flying technical interface to acquire this tool if required. 2.11. Firmware Upgrade HF-A21-SMT module supports firmware upgrade online; User can upgrade firmware via web access.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 28 3. OPERATION GUIDELINE 3.1. Configuration via Web Accessing When first use HF-A21-SMT modules, user may need some configuration. User can connect to HF-A21-SMT module‟s wireless interface with following default setting information and configure the module through laptop. Table 4 HF-A21-SMT Web Access Default Setting Parameters Default Setting SSID HF-A21x_AP IP Address 10.10.100.254 Subnet Mask 255.255.255.0 User Name admin Password admin 3.1.1. Open Web Management Interface Step 1: Connect laptop to SSID “HF-A21x_AP” of HF-A21-SMT 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 22. Open Web Management page The HF-A21-SMT 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”, and “Device Management” Notes: Default, High-Flying suggests all Web management related operation shall execute at AP mode. (Even you need configure STA parameters and want module works as STA mode). If user selects STA mode and still want to configurate the module through Web browser, you have to access the module through another AP (and get the module IP address through this AP.)
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 29 3.1.2. Mode Selection Page This page use to setting the module working mode (Transparent Transmission) and wireless networking mode (AP and STA mode). Figure 23. Mode Selection Page 3.1.3. AP Interface Setting Page This page use to setting the parameters when HF-A21-SMT module works as AP. Figure 24. AP Interface Setting Page 3.1.4. STA Interface Setting Page This page use to setting the parameters when HF-A21-SMT 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.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 30 Figure 25. STA Interface Setting Page 3.1.5. Application Setting Page This page use to setting the parameters of serial port communication, such as UART setting and high layer network protocol setting which used support serial communication. Figure 26. Application Setting Page Notes:
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 31 Generally, Network protocols support three modes: TCP Server, TCP Client, and UDP. UDP has no server and client requirement according to standard. 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 HF-A21-SMT module. Also the Port ID between two sides of the communication devices must keep the same. 3.1.6. Device Management Page This page use to manage HF-A21-SMT module general setting, such as administrator setting, restart module button, restore factory default setting button, and update firmware through webpage. Figure 27. 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 reflash the memory information with new changes. 3.2. HF-A21-SMT Usage Introduction 3.2.1. Software Debug Tools High-Flying use two common software tools debugging and applying HF-A21-SMT modules. (User can also select other tools used to debug serial and Ethernet port).  Serial Debugging Software: ComTools  Ethernet Debugging Software: TCPUDPDbg 3.2.2. Network Connection User can select two methods to connect HF-A21-SMT module base on dedicated application.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 32  Use HF-A21-SMT STA interface HF-A21-SMT and debug PC2 connect to a wireless AP, another PC1 (or user device) connect to HF-A21-SMT module with serial port: Figure 28. STA Interface Debug Connection  Use HF-A21-SMT AP interface Debug PC2 connect to HF-A21-SMT through wireless connection, another PC1 (or user device) connect to HF-A21-SMT module with serial port. Figure 29. AP Interface Debug Connection 3.2.3. Module Debug PC1 open “CommTools” program, setting the same serial port parameters with HF-A21-SMT module and open serial port connection. Figure 30. “CommTools” Serial Debug Tools
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 33 PC2 open “TCPUDPDbg” program, and create a new connection. If HF-A21-SMT configured as Server mode, “TCPUDPDbg” Tools shall create “Client “mode connection. Or otherwise, create a “Server” mode connection. Figure 31. “TCPUDPDbg” Tools Create Connection Then setting the TCP/UDP connection parameters. Default as following: Figure 32. “TCPUDPDbg” Tools Setting Then, click “Create” button to create a connection.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 34 Figure 33. “TCPUDPDbg” Tools Connection Now, in transparent transmission mode (HF-A21-SMT default setting), data can be transferred from “CommTools” program to “TCPUDPDbg” program, or in reverse. You can see data in receiver side will keep same as in sender side. 3.3. Typical Application Examples 3.3.1. Wireless Control Application Figure 34. Wireless Control Application For this wireless control application, HF-A21-SMT works as AP mode. Module‟s serial port connects to user device. So, control agent (Smart phone for this example) can manage and control the user device through the wireless connection with HF-A21-SMT module.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 35 3.3.2. Remote Management Application Figure 35. Remote Management Application For this remote management application, HF-A21-SMT works as STA mode and connects to Internet through wireless AP. Module configured as TCP Client and communicates with remote TCP server at Internet. Module‟s serial port connects to user device. So, user device‟s data or sampling information can send to remote TCP server for storage or processing. Also remote TCP server can send command to control and manage the user device through the wireless network. 3.3.3. Transparent Serial Port Application For this transparent serial port application, two HF-A21-SMT modules connect as below figures to build up a transparent serial port connection. Figure 36. Transparent Serial Port Application For left side HF-A21-SMT module, configured as AP mode and use default SSID and IP address, network protocol configured as TCP/Server mode, and protocol port ID: 8899. For right side HF-A21-SMT module, configured as STA mode and setting the same SSID （”HF-A11x_AP” for this example）with left side HF-A21-SMT module, enable DHCP network and network protocol configured as TCP/Client mode, protocol port ID: 8899. Target IP address part setting the same IP address with left side HF-A21-SMT module (“10.10.100.254” for this example).
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 36 When right side HF-A21-SMT boot up, it will find wireless AP (SSID：HF-A11x_AP for this example) and open TCP/Client network protocol to connect with left side module‟s TCP/Server. All these operation will be automatic and after finished, the two user devices connected to HF-A21-SMT module through serial port can communicate each other and think the connection between them is fully transparent. 3.3.4. Wireless Data Acquisition Card Application For this wireless data acquisition card application, one PC works as data server and every data acquisition card connects with a HF-A21-SMT module to support wireless connection function. Figure 37. Wireless Data Acquisition Card Application As above figure, one HF-A21-SMT configured as AP mode and all others configured as STA mode. All HF-A21-SMT which configured as STA and data server PC wireless connected to HF-A21-SMT which configured as AP to make up a wires network. Data server PC open TCP/Server protocol and all HF-A21-SMT modules open TCP/Client protocol. All data acquisition cards‟ data and sampling information can be transmitted to data server PC for operation.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 37 4. AT+INSTRUCTION INTRODUCTION 4.1. Configuration Mode When HF-A21-SMT power up, it will default works as transparent transmission mode, then user can switch to configuration mode by serial port command. HF-A21-SMT UART default parameters setting as below figure, Figure 38. HF-A21-SMT Default UART Port Parameters In configuration mode, user can setting the module through AT+ instruction set, which cover all web page setting function. 4.1.1. 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 39. 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 wrong step to UART port will cause the module still works as original mode (transparent transmission).
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 38 4.2. 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. Figure 40. ”AT+H” Instruction for Help 4.2.1. 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 AT+<CMD>[op][para-1,para-2,para-3,para-4…]<CR>  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;  <CR>：”Enter” Key, it‟s 0x0a or 0x0d in ASCII; Notes: When input AT+Instruction, “AT+<CMD>” character will display capital letter automatic and other parts will not change as you input.  Response Message +<RSP>[op] [para-1,para-2,para-3,para-4…]<CR><LF><CR><LF>  +: Prefix of response message;  RSP: Response string;
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 39  “ok” : Success  “ERR”: Failure  [op] : =  [para-n]: Parameters if query command or Error code when error happened;  <CR>: ASCII 0x0d;  <LF>: ASCIII 0x0a;  Error Code Table 5 Error Code DescribtionHF-A21-SMT 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 4.2.2. AT+ Instruction Set Table 6 AT+ Instruction Set List Instruction Description <null> NULL E Open/Close show back function ENTM Set module into transparent transmition mode NETP Set/Query network protocol parameters UART Set/Query serial port parameters UARTF Open/Close UART auto-frame function UARTFT Set/Query UART auto-frame trigger time UARTFL Set/Query UART auto-frame trigger length TMODE Set/Query data transmition mode (transparent transmition) WMODE Set/Query WIFI work mode (AP or STA) WSKEY Set/Query WIFI security parameters as STA WSSSID Set/Query WIFI target AP SSID parameters as STA WSLK Query WiFi link status as STA WEBU Set/Query WEB page login parameters (User Name and Password) WAP Set/Query WIFI parameters as AP WAKEY Set/Query WIFI security parameters as AP HIDESSID Set/Query hide AP‟s SSID MSLP Set modules into power save mode.(Turn OFF WiFi) WSCAN Seek AP when module works as STA mode TCPLK Query if TCP link already build-up TCPDIS Open/Cose TCP (Only TCP Client available) WANN Set/Query WAN setting, only effective as STA mode LANN Set/Query LAN setting, only effective as AP mode DHCPDEN Enable/Disable LAN DHCP server function DHCPGW Set/Query DHCP gateway address
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 40 TCPTO Set/Query TCP timeout MAXSK Set/Query maxima TCP connection TCPB Open/Close TCPB function TCPPTB Set/Query TCPB port number TCPADDB Set/Query TCPB server address TCPTOB Set/Query TCPB time out time TCPLKB Query TCPB link status EPHY Open/Close ETH interface STTC Enable/Disable STA port scan function DOMAIN Set/Query domain ofmodule webpage FRLDEN Enable/Disable nReload pin function RELD Restore to factory default setting Z Re-start module MID Query module ID information WRMID Set module ID VER Query module software version information H Help FVEW Enable/Disable WANN mode FVER Set/Query working mode WMAC Set/Query AP MAC address PING PING command Notes: HF-A21-SMT 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. 4.2.2.1. AT+E  Function: Open/Close show back function;  Format: AT+E<CR> +ok<CR>< LF ><CR>< LF > When HF-A21-SMT 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. 4.2.2.2. AT+ENTM  Function: Set module into transparent transmition mode;  Format: AT+ENTM<CR> +ok<CR>< LF ><CR>< LF > When operate this command, module switch from configuration mode to transparent transmission mode. 4.2.2.3. AT+NETP  Function: Set/Query network protocol parameters;  Format:  Query Operation
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 41 AT+NETP<CR> +ok=<protocol,CS,port,IP><CR>< LF ><CR>< LF >  Set Operation AT+NETP=<protocol,CS,port,IP><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  protocol:  TCP  UDP  CS: Network mode:  SERVER  CLIENT  Port: protocol port ID: Decimal digit and less than 65535  IP: Server‟s IP address when module set as client After HF-A21-SMT module boots up again, the setting will be effective. 4.2.2.4. AT+UART  Function: Set/Query serial port parameters;  Format:  Query Operation AT+UART<CR> +ok=<baudrate,data_bits,stop_bit,parity,flowctrl><CR>< LF ><CR>< LF >  Set Operation AT+UART=<baudrate,data_bits,stop_bit,parity><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  baudrate:  1200,1800,2400,4800,9600,19200,38400,57600,115200,230400  data_bits:  5,6,7,8  stop_bits:  1,2  parity:  NONE,EVEN,ODD,MARK,SPACE  flowctrl：hardware flow control (CTSRTS)  NFC: No flow control  FC: flow control After HF-A21-SMT module boots up again, the setting will be effective. 4.2.2.5. AT+ UARTF  Function: Open/Close UART auto-frame function;  Format:  Query Operation AT+ UARTF<CR> +ok=<para><CR>< LF ><CR>< LF >  Set Operation AT+ UARTF=<para ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  para:  disable - Close auto-frame function;  enable - Open auto-frame function;
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 42 4.2.2.6. AT+ UARTFT  Function: Set/Query UART auto-frame trigger time;  Format:  Query Operation AT+ UARTFT<CR> +ok=<time><CR>< LF ><CR>< LF >  Set Operation AT+ UARTFT=<time ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  time: Range 100 ~10000; Unit: ms. Auto-frame trigger time 4.2.2.7. AT+ UARTFL  Function: Set/Query UART auto-frame trigger length;  Format:  Query Operation AT+ UARTFL<CR> +ok=<len><CR>< LF ><CR>< LF >  Set Operation AT+ UARTFL=<len ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  len: Range 64 ~4096; Unit: byte. Auto-frame trigger length; 4.2.2.8. AT+TMODE  Function: Set/Query data transmition mode;  Format:  Query Operation AT+TMODE<CR> +ok=<tmode><CR>< LF ><CR>< LF >  Set Operation AT+ TMODE=<tmode><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  tmode: Data transmition mode  Through: Transparent transmition After HF-A21-SMT module boots up again, the setting will be effective. 4.2.2.9. AT+WMODE  Function: Set/Query WIFI work mode;  Format:  Query Operation AT+WMODE<CR> +ok=<mode><CR>< LF ><CR>< LF >  Set Operation AT+ WMODE=<mode><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  mode:WIFI work mode  AP  STA After HF-A21-SMT module boots up again, the setting will be effective.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 43 4.2.2.10. AT+WSKEY  Function: Set/Query WIFI security parameters as STA;  Format:  Query Operation AT+WSKEY<CR> +ok=<auth,encry,key><CR>< LF ><CR>< LF >  Set Operation AT+ WSKEY=< auth,encry,key><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  auth: Authentication mode  OPEN  SHARED  WPAPSK  encry:Encryption algorithm  NONE: When “auth=OPEN”, effective  WEP: When “auth=OPEN” or “SHARED”, effective  TKIP: When ”auth= WPAPSK”, effective  AES: When “auth= WPAPSK”, effective  key: password, ASCII code, shall less than 64 bit and greater than 8bit This Instruction only effective for HF-A21-SMT works as STA. After HF-A21-SMT module boots up again, the setting will be effective. But user can set this command when module configured as AP. 4.2.2.11. AT+WSSSID  Function: Set/Query WIFI target AP SSID parameters as STA.  Format:  Query Operation AT+WSSSID<CR> +ok=<ap’s ssid><CR>< LF ><CR>< LF >  Set Operation AT+ WSSSID=<ap’s ssid ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  ap‟s ssid: AP‟s SSID This Instruction only effective for HF-A21-SMT works as STA. After HF-A21-SMT module boots up again, the setting will be effective. But user can set this command when module configured as AP. 4.2.2.12. AT+ WSLK  Function: Query WiFi link status as STA  Format:  Query Operation AT+ WSLK<CR> +ok=<ret><CR>< LF ><CR>< LF >  Parameters:  ret  ”Disconnected”, if no WiFi connection;  ”AP‟ SSID（AP‟s MAC” ）, if WiFi connection available;  ”RF Off”, if WiFi OFF; This Instruction only effective for HF-A21-SMT works as STA. After HF-A21-SMT module boots up again, the setting will be effective. But user can set this command when module configured as AP.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 44 4.2.2.13. AT+WEBU  Function: Set/Query WEB page login parameters;  Format:  Query Operation AT+WEBU<CR> +ok=<usr,password><CR>< LF ><CR>< LF >  Set Operation AT+ WEBU=< usr,password ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  usr: User name for WEB page access;  password：Password for WEB page access; 4.2.2.14. AT+WAP  Function: Set/Query WIFI parameters as AP;  Format:  Query Operation AT+WAP<CR> +ok=<wifi_mode,ssid,channel><CR>< LF ><CR>< LF >  Set Operation AT+ WAP=<wifi_mode,ssid,channel><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  wifi_mode: WiFi protocols  11BG  11B  11G  11BGN  11N  ssid: SSID when module works as AP;  channel: WIFI channel selection  AUTO  CH1~CH11 This Instruction only effective for HF-A21-SMT works as AP. After HF-A21-SMT module boots up again, the setting will be effective. But user can set this command when module configured as STA. 4.2.2.15. AT+WAKEY  Function: Set/Query WIFI security parameters as AP;  Format:  Query Operation AT+WAKEY<CR> +ok=<auth,encry,key><CR>< LF ><CR>< LF >  Set Operation AT+ WAKEY=< auth,encry,key><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  auth: Authentication mode  OPEN  SHARED  WPAPSK  encry:Encryption algorithm  NONE: When “auth=OPEN”, effective;  WEP: When “auth=OPEN”, effective or “SHARED”, effective;
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 45  TKIP: When “auth=WPAPSK”, effective;  AES:When “auth=WPAPSK”, effective;  TKIPAES:When “auth=WPAPSK”, effective;  key: password, ASCII code, shall less than 64 bit and greater than 8bit; This Instruction only effective for HF-A21-SMT works as AP. After HF-A21-SMT module boots up again, the setting will be effective. But user can set this command when module configured as STA. 4.2.2.16. AT+HIDESSID  Function: Set/Query hide AP‟s SSID;  Format:  Query Operation AT+ HIDESSID <CR> +ok=<sta.><CR>< LF ><CR>< LF >  Set Operation AT+ HIDESSID=<sta><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  When Query,sta reply if module‟s SSID is hide;  On – not hide SSID;  Off - hide SSID;  When Set,  Off - hide SSID;  On - not hide SSID; 4.2.2.17. AT+MSLP  Function: Set modules into power save mode.(Turn OFF WiFi);  Format:  Query Operation AT+ MSLP <CR> +ok=<sta.><CR>< LF ><CR>< LF >  Set Operation AT+ MSLP=<on/off><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  When Query,sta reply if the module in sleep mode;  On - Module not in sleep mode (WiFi ON);  Off - Module in sleep mode(WiFi OFF);  When Set,  Off - Set module to sleep mode (WiFi OFF);  On - Set module to normal mode (WiFi ON); When module go into sleep mode, user can input “AT+MSLP=on” to re-start the module and module go into transparent transmission mode. 4.2.2.18. AT+WSCAN  Function: Seek AP when module works as STA mode;  Format: AT+ WSCAN<CR> +ok=<ap_site><CR>< LF ><CR>< LF >  Parameters:  ap_site: AP searched; 4.2.2.19. AT+ TCPLK  Function: Query if TCP link already build-up;  Format:
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 46 AT+ TCPLK<CR> +ok=<sta><CR>< LF ><CR>< LF >  Parameters:  sta.: if module already setup TCP link;  on: TCP link setup;  off: TCP link not setup; 4.2.2.20. AT + TCPDIS  Function: Open/Cose TCP (Only TCP Client available);  Format:  Query Operation AT+TCPDIS<CR> +ok=<sta><CR>< LF ><CR>< LF >  Set Operation AT+ TCPDIS=<on/off><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  sta.: set/qurey TCP link status;  on: TCP link availabe; When setting “on”, module will connect to TCP server right away.  off: TCP link not availabe; when setting “off”, module will disconnect with TCP server and not connect again. 4.2.2.21. AT+ WANN  Function: Set/Query WAN setting, only effective as STA mode;  Format:  Query Operation AT+WANN<CR> +ok=<mode,address,mask,gateway><CR>< LF ><CR>< LF >  Set Operation AT+ WANN=< mode,address,mask,gateway ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  mode: IP setting for WAN port  static: Static IP  DHCP: Dynamic IP  address: WAN port IP address;  mask: WAN port subnet mask;  gateway: WAN port gateway address; This Instruction only effective for HF-A21-SMT works as STA. After HF-A21-SMT module boots up again, the setting will be effective. But user can set this command when module configured as AP. 4.2.2.22. AT+ LANN  Function: Set/Query LAN setting, only effective as AP mode;  Format:  Query Operation AT+LANN<CR> +ok=<address,mask ><CR>< LF ><CR>< LF >  Set Operation AT+ LANN=<address,mask ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  address: LAN port IP address;  mask: LAN port subnet mask;
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 47 This Instruction only effective for HF-A21-SMT works as AP. After HF-A21-SMT module boots up again, the setting will be effective. But user can set this command when module configured as STA. 4.2.2.23. AT + DHCPDEN  Function: Enable/Disable LAN DHCP server function;  Format:  Query Operation AT+DHCPDEN<CR> +ok=<sta><CR>< LF ><CR>< LF >  Set Operation AT+ DHCPDEN=<sat><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  sta. if Enable/Disable LAN DHCP server function;  on: Enable LAN DHCP server function.  off: Disable LAN DHCP server function. 4.2.2.24. AT+ DHCPGW  Function: Set/Query DHCP gateway address;  Format:  Query Operation AT+ DHCPGW<CR> +ok=<address><CR>< LF ><CR>< LF >  Set Operation AT+ DHCPGW=<address ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  address: DHCP gate address; 4.2.2.25. AT+ TCPTO  Function: Set/Query TCP timeout;  Format:  Query Operation AT+ TCPTO<CR> +ok=<time><CR>< LF ><CR>< LF >  Set Operation AT+ TCPTO=<time ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  time: TCP timeout time.  <= 600, (600s);  >=0, (0 means no timeout);  Default, 300s; 4.2.2.26. AT+ MAXSK  Function: Set/Query maxima TCP connection;  Format:  Query Operation AT+ MAXSK<CR> +ok=<num><CR>< LF ><CR>< LF >  Set Operation AT+ MAXSK =<num ><CR> +ok<CR>< LF ><CR>< LF >  Parameters:
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 48  num: 1~32, default 32. maxima TCP connection; When configure as TCP/Server, HF-A21-SMT support maxime 32 TCP connections. If not require so much connection, user can resetting this parameters. 4.2.2.27. AT+TCPB  Function: Open/Close TCPB function;  Format:  Query Operation AT+TCPB<CR> +ok=<sta><CR>< LF ><CR>< LF >  Set Operation AT+ TCPB=<on/off><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  sta: TCPB enable status  on, TCPB enable  off, TCPB disable After HF-A21-SMT module boots up again, the setting will be effective. 4.2.2.28. AT+TCPPTB  Function: Set/Query TCPB port number;  Format:  Query Operation AT+TCPPTB<CR> +ok=<port><CR>< LF ><CR>< LF >  Set Operation AT+ TCPB=<port><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  port: decimal ,<65535 After HF-A21-SMT module boots up again, the setting will be effective. 4.2.2.29. AT+TCPADDB  Function: Set/Query TCPB server address;  Format:  Query Operation AT+TCPADDB<CR> +ok=<add><CR>< LF ><CR>< LF >  Set Operation AT+ TCPADDB=<add><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  add: TCPB server address, can be IP address or url. After HF-A21-SMT module boots up again, the setting will be effective 4.2.2.30. AT+TCPTOB  Function: Set/Query TCPB time out time;  Format:  Query Operation AT+TCPTOB<CR> +ok=<time><CR>< LF ><CR>< LF >  Set Operation AT+ TCPTOB=<time><CR> +ok<CR>< LF ><CR>< LF >
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 49  Parameters:  time: TCPB time out time, <=600 (600s), >=0 (No time out), default 300 After HF-A21-SMT module boots up again, the setting will be effective. 4.2.2.31. AT+TCPLKB  Function: Query TCPB link status;  Format: AT+TCPCKB<CR> +ok=<sta><CR>< LF ><CR>< LF >  Parameters:  sta: TCPB link status  on, TCPB link OK  off, TCPB link not availabe 4.2.2.32. AT+EPHY  Function: Enable ETH interface;  Format:  Set Operation AT+ EPHY=<CR> +ok<CR>< LF ><CR>< LF > Ethenet port function is disabled bydefault. Input this command to enable Ethenet. This command is not saved, this means after the module reset, Ethenet is disabled by default. Input “AT+FEPHY=on” to enable Ethenet forever.. 4.2.2.33. AT+STTC  Function: Enable/Disable STA port scan function;  Format:  Query Operation AT+ STTC<CR> +ok=<sta><CR>< LF ><CR>< LF >  Set Operation AT+ STTC=<on/off><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  sta: when query, this value feedback  On: Enable STA port scan function;  Off: Disable STA port scan function; 4.2.2.34. AT+DOMAIN  Function: Set/Query domain ofmodule webpage;  Format:  Query Operation AT+ DOMAIN<CR> +ok=<domain><CR>< LF ><CR>< LF >  Set Operation AT+ DOMAIN=<domain><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  domain: domain to acess to module webpage. 4.2.2.35. AT+FRLDEN  Function: Enable/Disable nReload pin function;  Format:  Query Operation
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 50 AT+ FRLDEN<CR> +ok=< on/off ><CR>< LF ><CR>< LF >  Set Operation AT+ FRLDEN=<on/off><CR> +ok<CR>< LF ><CR>< LF >  Parameters:  on/off: Enable or Disable nReload pin function.  On, enable nReload pin function;  Off, disable nReload pin function; Notes: AT+FRLDEN is F-Setting, means restore to factory setting will not affect this command. 4.2.2.36. AT+RELD  Function: Restore to factory default setting;  Format: AT+ RELD<CR> +ok=rebooting…<CR>< LF ><CR>< LF > This command restores the module to factory default setting, and then re-starts the module. 4.2.2.37. AT+Z  Function: Re-start module;  Format: AT+ Z<CR> 4.2.2.38. AT+MID  Function: Query module ID information;  Format:  Query Operation AT+MID<CR> +ok=<module_id><CR><LF><CR><LF>  Parameters:  module_id: Module ID information; 4.2.2.39. AT+WRMID  Function: Set module ID information;  Format:  Set Operation AT+WRMID=<module_id><CR> +ok<CR><LF><CR><LF>  Parameters:  module_id: Module ID information; 4.2.2.40. AT+VER  Function: Query module software version information;  Format:  Query Operation AT+VER<CR> +ok=<ver><CR><LF><CR><LF>  Parameters:  ver: Module software version information; 4.2.2.41. AT+H  Function: Help;  Format:
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 51  Query Operation AT+H<CR> +ok=<commod help><CR><LF><CR><LF>  Parameters:  commod help: command introduction; 4.2.2.42. AT+FVEW  Function: Enable/Disable Ethernet WANN mode. It's valid only if restore to factory setting.;  Format:  Query Operation AT+ FVEW<CR> +ok=<status><CR><LF><CR><LF>  Set Operation AT+ FVEW=<status><CR> +ok<CR><LF><CR><LF>  Parameters:  status: Enable or Disable Ethernet WANN mode..  enable, enable Ethernet WANN mode;  disable, disable Ethernet WANN mode, then it works in Ethernet LANN mode.(default mode) If Ethernet WANN mode is valid. Then wireless connecting router in STA mode is invalid. It only support connecting to router by Ethernet.. 4.2.2.43. AT+FVER  Function: Set/Query module working mode;  Format:  Query Operation AT+ FVER<CR> +ok=<status><CR><LF><CR><LF>  Set Operation AT+ FVER=<n/z><CR> +ok<CR><LF><CR><LF>  Parameters:  status: module working mode..  n: router mode.(default mode)  z: bridge mode. 4.2.2.44. AT+WMAC  Function: Set/Query module MAC address;  Format:  Query Operation AT+ WMAC<CR> +ok=<address><CR><LF><CR><LF>  Set Operation AT+ WMAC=<address><CR> +ok<CR><LF><CR><LF>  Parameters:  address: module MAC address in AP mode. The module‟s STA MAC address is AP‟s MAC address plus 1. For example, AP address: ACCF23208888, then STA address: ACCF23208889. 4.2.2.45. AT+PING  Function: PING command;  Format:
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 52  Set Operation AT+ PING=<address><CR> +ok=<status><CR><LF><CR><LF>  Parameters:  address: target IP address.  Status:command result.
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com 53 5. PACKAGE INFORMATION 5.1 Shipping Information TRAY BOX Size:350*350*70 mm Size:350*350*350 mm Figure 41. Shipping Information Note: 1 tray = 500 pcs 1 box = 5 trays = 5 * 100 pcs = 2500pcs
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com - 54 - APPENDIX A: QUESTIONS AND ANSWERS Q1: How to configure transparent serial port application (TCP protocol) with two HF-A21-SMT modules?  Network structure as below figure:  Module 1# Setting:  Works as AP mode; --See “Mode Selection Page”  LAN IP address: 10.10.100.254; --See “AP Interface Setting Page”  Network Protocal:TCP/Server, Port ID: 8899; -- See “Application Setting Page” (Module default setting);  Module 2# Setting:  Works as STA mode; --See “Mode Selection Page”  WAN connection type: DHCP or Static IP (For this example:10.10.100.100) --See “STA Interface Setting Page”  Network Protocal:TCP/Client, Port ID: 8899; Application IP address: Module 1#‟s LAN IP address (10.10.100.254); -- See “Application Setting Page”  Notes: When module 2# works as STA mode, module‟s WiFi interface works as WAN port. Module‟s WAN IP address and LAN IP address shall be setting different segment. So, module 2#‟s LAN IP address must change to other segment; (For this sample, we change to 10.10.99.254); --See “AP Interface Setting Page” HF-A21-SMTAP, LAN IP:10.10.100.254TCP, Server8899HF-A21-SMTSTA, LAN IP:10.10.99.254WAN IP: 10.10.100.100TCP, Client10.10.100.254: 88991# 2#WIFIMCUMCU UARTUART Figure 42. Configure Transparent Serial Port Connection (TCP) Q2: Where to Set HF-A21-SMT Module LAN IP and WAN IP through Web Page？  HF-A21-SMT Wireless LAN IP address setting see “AP Interface Setting Page” as below Figure,
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com - 55 - Figure 43. Module LAN IP Setting  HF-A21-SMT Wireless WAN IP address setting see “STA Interface Setting Page” as below Figure, User can set WAN connection type to DHCP and STATIC IP. Figure 44. Module WAN IP Setting Q3: How to configure transparent serial port application (UDP protocol) with two HF-A21-SMT modules?  Network structure as below figure:  Module 1# Setting:  Works as AP mode; --See “Mode Selection Page”  LAN IP address: 10.10.100.254; --See “AP Interface Setting Page”  Network Protocal:UDP, Port ID: 8899; Application IP address:10.10.100.100; -- See “Application Setting Page”  Module 2# Setting:  Works as STA mode; --See “Mode Selection Page”  WAN connection type: Static IP (10.10.100.100) --See “STA Interface Setting Page”  Network Protocal:UDP, Port ID: 8899; Application IP address: Module 1#‟s LAN IP address (10.10.100.254); -- See “Application Setting Page”  LAN IP address: 10.10.99.254 (Different net segment with WAN port) --See “AP Interface Setting Page” HF-A21-SMTAP, LAN IP:10.10.100.254UDP10.10.100.100:8899HF-A21-SMTSTA, LAN IP:10.10.99.254WAN IP: 10.10.100.100UDP10.10.100.254:88991# 2#WIFIMCUMCU UARTUART Figure 45. Configure Transparent Serial Port Connection (UDP) Q4: Where to set HF-A21-SMT module network protocol (TCP/UDP)?  HF-A21-SMT network protocol setting see “Application Setting Page” as below Figure,  Protocol: TCP Server
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com - 56 -  Only Port ID required: 8899 (Default) Figure 46. Module Network Protocols: TCP/Server  Protocol: TCP Client  Application IP address required: it‟s target TCP server „s IP address;  Port ID required: 8899 (Default) Figure 47. Module Network Protocol: TCP/Client  Protocol: UDP  No Server/Client selection required;  Application IP address required: it‟s target device „s IP address;  Port ID required: 8899 (Default) Figure 48. Module Network Protocol: UDP Q5: How to configure transparent serial port application: Two HF-A21-SMT modules all configured as STA and connection through AP?  Network structure as below figure:  Module 1# Setting: ( We use HF-A21-SMT as AP for this example)  Works as AP mode and all default setting;
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com - 57 -  Module 2# Setting:  Works as STA mode; --See “Mode Selection Page”  WAN connection type: Static IP: 10.10.100.100; --See “STA Interface Setting Page”  Network Protocal:TCP/Server, Port ID: 8899; -- See “Application Setting Page”  LAN IP address: 10.10.99.254 (Different net segment with WAN port); --See “AP Interface Setting Page”  Module 3# Setting:  Works as STA mode; --See “Mode Selection Page”  WAN connection type: Static IP: 10.10.100.101; --See “STA Interface Setting Page”  Network Protocal:TCP/Client, Port ID: 8899; Application IP address: Module 2#‟s WAN IP address (10.10.100.100); -- See “Application Setting Page”  LAN IP address: 10.10.98.254 (Different net segment with WAN port); --See “AP Interface Setting Page” HF-A21-SMTAP, LAN IP:10.10.100.254TCP, Server8899HF-A21-SMTSTA, LAN IP:10.10.98.254WAN IP: 10.10.100.101TCP, Client10.10.100.100: 88992# 3#WIFIMCUMCU UARTUARTHF-A21-SMT1#WIFISTA, LAN IP:10.10.99.254WAN IP: 10.10.100.100TCP, Server8899 Figure 49. Two HF-A21-SMT Modules Connection Through AP Q6: How to avoid IP address confliction when apply HF-A21-SMT module?  The following address allocation method can avoid the IP address confliction for dynamic and static IP address mixed application.  Module dynamic IP address range from 100 to 200 for last IP address segment.  Such as default IP: 10.10.100.254. When module works as AP, the IP address module can allocate to STA is from 10.10.100.100 to 10.10.100.200;  So, if user needs to set static IP for dedicated STA internal network, the available IP address range can start from 10.10.100.1 to 10.10.100.99. Q7: PC works as server, all HF-A21-SMT modules works as data acquisition card and connect with PC, how to configure this application?  Network structure as below figure: Three HF-A21-SMT module setup 3 TCP links with PC server. Module 1# works as AP and all devices connect to module 1# through WiFi interface;  PC Setting:  IP address: 10.10.100.100;  Network Protocal:TCP/Server, Port ID: 8899;  Module 1# Setting:
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com - 58 -  Works as AP mode;  LAN IP address: 10.10.100.254;  Network Protocal:TCP/Client, Port ID: 8899; Application IP address:10.10.100.100;  Module 2# Setting:  Works as STA mode;  WAN connection type: Static IP: 10.10.100.101;  Network Protocal:TCP/Client, Port ID: 8899; Application IP address:10.10.100.100;  LAN IP address: 10.10.99.254 (Different net segment with WAN port);  Module 3# Setting:  Works as STA mode;  WAN connection type: Static IP: 10.10.100.102;  Network Protocal:TCP/Client, Port ID: 8899; Application IP address:10.10.100.100;  LAN IP address: 10.10.98.254 (Different net segment with WAN port); HF-A21-SMTAP, LAN IP:10.10.100.254TCP, Client10.10.100.100:8899HF-A21-SMTSTA, LAN IP:10.10.98.254WAN IP: 10.10.100.102TCP, Client10.10.100.100: 88992# 3#WIFIMCUMCU UARTUARTHF-A21-SMT1#WIFISTA, LAN IP:10.10.99.254WAN IP: 10.10.100.101TCP, Client10.10.100.100:8899WIFIPCIP: 10.10.100.100TCP, Server8899MCUUART Figure 50. Wireless Data Acquisition Card Setting
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com - 59 - APPENDIX B: EVB REFERENCE DESIGN
HF-A21-SMT Embedded WiFi Module User Manual Shanghai High-Flying Electronics Technology Co., Ltd www.hi-flying.com - 60 - APPENDIX C: CONTACT INFORMATION ------------------------------------------------------------------------------------------------------------ Address: Room 1002,Building 1,No.3000,Longdong Avenue,Pudong New Area,Shanghai,China, 201203 Web: www.hi-flying.com Service Online: 400-189-3108 Mail Contact: sales@hi-flying.com ----------------------------------------------------------------------------------------------------------- END OF DOCUMENT © Copyright High-Flying, May, 2011 The information disclosed herein is proprietary to High-Flying and is not to be used by or disclosed to unauthorized persons without the written consent of High-Flying. The recipient of this document shall respect the security status of the information. The master of this document is stored on an electronic database and is “write-protected” and may be altered only by authorized persons at High-Flying. Viewing of the master document electronically on electronic database ensures access to the current issue. Any other copies must be regarded as uncontrolled copies.
FCC INFORMATION (additional) OEM INTEGRATION INSTRUCTIONS: This device is intended only for OEM integrators under the following conditions: The module must be installed in the host equipment such that 20 cm is maintained between the antenna and users, and the transmitter module may not be co-located with any other transmitter or antenna. The module shall be only used with the internal antenna(s) that has been originally tested and certified with this module. As long as 3 conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, etc.). Validity of using the module certification: In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization for this module in combination with the host equipment is no longer considered valid and the FCC ID of the module cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization. End product labeling: This transmitter module is authorized only for use in device where the antenna may be installed such that 20 cm may be maintained between the antenna and users. The final end product must be labeled in a visible area with the following: “Contains FCC ID: 2ACSV-HF-A21-SMT”. Information that must be placed in the end user manual: The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user's manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. This device must be kept away from all persons by 20cm or more and installations using less distance, or installations using antennas with gain greater than that with which this was Certified will require additional approvals.Antenna Specification:Type: PCB AntennaModel: HF-A21-SMTBrand: High-FlyingGain: 2.07dBi

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