WIZNET WIZFI220 Wireless LAN Module User Manual

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WizFi220 User Manual
(Version 1.0)
©2011 WIZnet Co., Ltd. All Rights Reserved.
☞ For more information, visit our website at http://www.wiznet.co.kr
WizFi220 User Manual (WIZnet Co., Ltd.)
Certification Information
KCC for Class B ITE
INFORMATION TO THE USER
This equipment has been tested for a Class B digital device.
Trade Name or Applicant : WIZnet, Co., Ltd.
Equipment Name : Wireless LAN Module
Model Number : WizFi220
Derivative Model Number : WizFi220CA
Manufacturer / Country of Origin : WIZnet, Co., Ltd. / KOREA
Certification Number : KCC-CRM-WWW-WIZFI220
CE for Class B ITE
INFORMATION TO THE USER
Hereby, WIZnet. Declares that this WizFi220 is in compliance with the essential requirements
and other relevant provisions of directive 1999/5/EC.
WARNING: This is a class B product. In a domestic environment this product may cause radio
interference in which case the user may be required to take adequate measures.
WizFi220 User Manual (WIZnet Co., Ltd.)
Certification Information
FCC for Class B ITE
INFORMATION TO THE USER
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 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 NOTICE TO USERS:
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:
1. This equipment may generate or use radio frequency energy. Changes or modifications
to this equipment may cause harmful interference unless the modifications are
expressly approved in the instruction manual. The user could lose the authority to
operate this equipment if an unauthorized change or modification is made.
2. 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. This transmitter must not
be co-located or operating in conjunction with any other antenna or transmitter.
WizFi220 User Manual (WIZnet Co., Ltd.)
Document Revision History
Date
Revision
2011-05-24
V1.0
Changes
Official Release
WizFi220 User Manual (WIZnet Co., Ltd.)

1.
2.
3.
4.
5.
Overview ........................................................................................................................ 1
(1) Benefits and Features .............................................................................................. 2
(2) Specifications .......................................................................................................... 3
Hardware Specification ................................................................................................... 4
(1) Operating Conditions .............................................................................................. 4
(2) Digital Input Specifications ...................................................................................... 4
(3) Digital Output Specifications ................................................................................... 4
(4) I/O Digital Specification (Tri-State)........................................................................... 5
(5) RTC Input Specifications .......................................................................................... 6
(6) RTC Output Specifications ....................................................................................... 6
(7) Internal 1.8V regulator ............................................................................................ 7
RF Specification .............................................................................................................. 8
(8) Block Diagram ......................................................................................................... 9
(9) Pin Description ...................................................................................................... 10
(10)
Module Dimension .......................................................................................... 14
(11)
Recommend Pad Dimension............................................................................ 15
(12)
LED Indications ............................................................................................... 15
Application Guide ......................................................................................................... 16
(1) AP Scanning .......................................................................................................... 16
(2) Network Connection Management ........................................................................ 16
(3) Auto Connection Operation .................................................................................. 16
(4) Response Codes .................................................................................................... 17
(5) Use of GPIO10 ...................................................................................................... 18
(6) AT Command example .......................................................................................... 19
AT Commands .............................................................................................................. 20
(1) Command interface ............................................................................................... 20
(2) UART / adapter interface configuration ................................................................. 20
(3) Profile management .............................................................................................. 21
(4) Wi-Fi interface....................................................................................................... 22
(5) Wi-Fi security ........................................................................................................ 22
(6) Wireless configuration ........................................................................................... 24
(7) Network interface.................................................................................................. 24
(8) Connection management ...................................................................................... 25
(9) Battery check ........................................................................................................ 26
(10)
Power state management ................................................................................ 26
(11)
Auto connection.............................................................................................. 26
(12)
Provisioning .................................................................................................... 27
(13)
Miscellaneous.................................................................................................. 27
Hardware Installation .................................................................................................... 29
Warranty ...................................................................................................................... 31
WizFi220 User Manual (WIZnet Co., Ltd.)

TABLE 1. SPECIFICATIONS ................................................................................................................................... 3
TABLE 2. OPERATING CONDITIONS ................................................................................................................4
TABLE 3. DIGITAL INPUT SPECIFICATIONS ..................................................................................................4
TABLE 4. DIGITAL OUTPUT SPECIFICATIONS .............................................................................................4
TABLE 5. I/O DIGITAL SPECIFICATION ............................................................................................................5
TABLE 6. RTC INPUT SPECIFICATIONS ..........................................................................................................6
TABLE 7. RTC OUTPUT SPECIFICATIONS.....................................................................................................6
TABLE 8. INTERNAL 1.8V REGULATOR ..........................................................................................................7
TABLE 9. RF SPECIFICATION............................................................................................................................... 8
TABLE 10. PIN DESCRIPTION ........................................................................................................................... 13
TABLE 11. LED INDICATIONS ............................................................................................................................ 15
TABLE 12. RESPONSE CODES ........................................................................................................................ 18
TABLE 13. AT COMMAND EXAMPLE .............................................................................................................. 19
TABLE 14. COMMAND INTERFACE ................................................................................................................ 20
TABLE 15. UART / ADAPTER INTERFACE CONFIGURATION ............................................................ 21
TABLE 16. PROFILE MANAGEMENT .............................................................................................................. 21
TABLE 17. WI-FI INTERFACE ............................................................................................................................. 22
TABLE 18. WI-FI SECURITY ............................................................................................................................... 23
TABLE 19. WIRELESS CONFIGURATION..................................................................................................... 24
TABLE 20. NETWORK INTERFACE ................................................................................................................. 24
TABLE 21. CONNECTION MANAGEMENT ................................................................................................... 26
TABLE 22. BATTERY CHECK ............................................................................................................................. 26
TABLE 23. POWER STATE MANAGEMENT ................................................................................................. 26
TABLE 24. AUTO CONNECTION ....................................................................................................................... 27
TABLE 25. PROVISIONING ................................................................................................................................. 27
TABLE 26. MISCELLANEOUS ............................................................................................................................ 28
WizFi220 User Manual (WIZnet Co., Ltd.)


FIGURE 1. BASIC DIAGRAM ............................................... 오류! 책갈피가 정의되어 있지 않습니다.
FIGURE 2. BLOCK DIAGRAM ............................................................................................................................... 9
FIGURE 3. PIN DESCRIPTION .......................................................................................................................... 10
FIGURE 4. MODULE DIMENSION .................................................................................................................... 14
FIGURE 5. RECOMMEND PAD DIMENSION ............................................................................................... 15
FIGURE 6. VIN = BATTERY.................................................... 오류! 책갈피가 정의되어 있지 않습니다.
FIGURE 7. VIN = AC ADAPTOR ........................................... 오류! 책갈피가 정의되어 있지 않습니다.
FIGURE 8. FIRMWARE DOWNLOAD ............................... 오류! 책갈피가 정의되어 있지 않습니다.
FIGURE 9. INTERFACE.......................................................... 오류! 책갈피가 정의되어 있지 않습니다.
FIGURE 10. FACTORY DEFAULT AND AD HOC MODE ......................................................................... 18
WizFi220 User Manual (WIZnet Co., Ltd.)
1. Overview
The WizFi220 family of fully certified modules offers a quick, easy, and cost effective way for
device and appliance manufacturers to add Wi-Fi capabilities to their products. The module
provides serial UART interface which enables connection to any embedded design utilizing
an 8/16/32-bit microcontroller via simple commands. The WizFi220 is an ideal solution for
organizations with limited or no Wi-Fi or RF expertise, as it not only dramatically reduces RF
design time but also removes the burden of testing and certification; allowing customers to
focus on their core application, product, or expertise. The module supports data rates up to
11 Mbps, and is compliant with 802.11b.
The WizFi220 provides customers the mean to evaluate the capabilities of ultra-low power
wireless system-on-a-chip and the Serial to Wi-Fi embedded software for Wi-Fi networks.
The Serial to Wi-Fi embedded software allows devices and appliance manufacturers to easily
add Wi-Fi capabilities to their products with minor impact on the host microcontroller
firmware.
The WizFi220 provides all the hardware and software necessary to quickly set up a serial
(UART) based link to a PC or external microcontroller.
The WizFi220 is a RF-enhanced Product. Except for [RF Output Power], the WizFi220 is
similar in management and development to the WizFi210. In other words, the WizFi220 will
consume more power but it has the improved WiFi range.
WizFi 210 User Manual (WIZnet Co., Ltd.)
(1) Benefits and Features
 Brings Wi-Fi connectivity to any device with a microcontroller and serial HOST
interface (UART)
 Minimal Serial to Wi-Fi “driver” footprint on host microcontroller and minor
changes to existing host MCU firmware
 Offloading of smaller host microcontrollers from the Wi-Fi and TCP/ IP networking
 Simple AT commands for configuration and data communication
 DHCP/Static IP, TCP/UDP, Server/Client, DNS
 Reduces development time, testing and certification burden, accelerating time to
market
 Easy device provisioning through our utility or Wi-Fi Protected Set-up (WPS)
 Ultra low power consumption through dynamic power management
 Operates with standard 802.11b access points at speed up to 11 Mbps (802.11b)
 802.11i Security (WEP, WPA, WPA2-PSK, Enterprise)
 Rich I/O interfaces (SPI, UART, GPIO, I2C, ADC, JTAG)
 Low power modes, Alarm Input for wake-up
 High-throughput hardware AES and RC4 encryption/decryption engines
WizFi 210 User Manual (WIZnet Co., Ltd.)
(2) Specifications
Specifications
Description
Radio Protocol
IEEE 802.11b Compatible
Supported Data Rates
11, 5.5, 2, 1 Mbps (802.11 b)
Modulation
DSSS and CCK
RF Operating Frequency
2.412 - 2.462 GHz
Antenna Options
U.FL connector for external antenna
Networking Protocols
Power Consumption
(Typical)
RF Output Power (Typical)
Security Protocols
UDP, TCP/IP (IPv4), DHCP, ARP, DNS, HTTP/HTTPS Client
and Server(*)
Standby = 34.0 µA
Receive = 124.0 mA
Transmit = 290.0 mA
17dBm ± 1.5dB
WEP, WPA/WPA2 – PSK, Enterprise, EAP-FAST, EAP-TLS,
EAP-TTLS, PEAP
I/O Interface
UART, SPI(*), I2C(*), WAKE, ALARM, GPIOs
Power Source
3.3V
Dimensions
32 x 23.5 x 3 mm
Table 1. Specifications
(*) is supported by software customizing.
WizFi 210 User Manual (WIZnet Co., Ltd.)
2. Hardware Specification
(1) Operating Conditions
Min
Typ
Max
Unit
+85
°C
Operating Ambient Range
-40
RTC Supply Voltage
1.2
3.3
3.6
Single Supply Voltage
3.0
3.3
3.6
Table 2. Operating Conditions
(2) Digital Input Specifications
IO Supply Voltage
Min
Typ
Max
Unit
1.62/3
1.8/3.3
1.98/3.63
Input Low Voltage (VIL)
-0.3
0.25VDDIO
Input High Voltage (VIH)
0.8VDDIO
VDDIO
Schmitt trig. Low to High threshold point (VT+)
1.5
Schmitt trig. High to Low threshold point (VT-)
Table 3. Digital Input Specifications
(3) Digital Output Specifications
IO Supply Voltage
Min
Typ
Max
Unit
1.62/3
1.8/3.3
1.98/3.63
Output Low Voltage (VIL)
0.4
Output High Voltage (VIH)
1.3
VDDIO
Output rise time (tTLH)
ns
Output fall time (tTHL)
ns
Table 4. Digital Output Specifications
WizFi 210 User Manual (WIZnet Co., Ltd.)
(4) I/O Digital Specification (Tri-State)
IO Supply Voltage
Min
Typ
Max
1.62/3
1.8/3.3
1.98/3.63
Unit
Input Low Voltage (VIL)
-0.3
0.25VDDIO
Input High Voltage (VIH)
0.8VDDIO
VDDIO
Schmitt trig. Low to High threshold
point (VT+)
1.5
Schmitt trig. High to Low threshold
point (VT-)
Pull-Up Resistor (Ru)
0.05
MΩ
Pull-Down Resistor (Rd)
0.05
Output Low Voltage (VOL)
0.4
Output High Voltage (VOH)
1.3
VDDIO
ns
Output rise time @ 3.3V (tToLH)
ns
Output fall time @ 3.3V (tToHL)
ns
Input rise time (tTiLH)
ns
Input fall time (tTiHL)
ns
Table 5. I/O Digital Specification
WizFi 210 User Manual (WIZnet Co., Ltd.)
(5) RTC Input Specifications
Min
Typ
Max
Unit
RTC Supply Voltage (VDDRTC)
1.2
3.6
Input Low Voltage (VIL)
-0.3
0.25VDDRTC
Input High Voltage (VIH)
0.8VDDRTC
VDDRTC
0.57VDDRTC
0.68VDDRTC
0.27VDDRTC
0.35VDDRTC
Max
Unit
1.2
3.6
Output Low Voltage (VOL)
0.4
Output High Voltage (VOH)
0.8VDDRTC
VDDRTC
Output rise time (tTLH)
19
142
ns
Output fall time (tTHL)
21
195
ns
Schmitt trig. Low to High threshold
point (VT+)
Schmitt trig. High to Low threshold
point (VT-)
Table 6. RTC Input Specifications
(6) RTC Output Specifications
Min
RTC Supply Voltage (VDDRTC)
Typ
Table 7. RTC Output Specifications
WizFi 210 User Manual (WIZnet Co., Ltd.)
(7) Internal 1.8V regulator
Min
Typ
Output Voltage (VOUT_1V8)
1.8
Maximum Output Current (IVOUT_1V8)
250
1.8V Regulator Enable "H" Voltage
(EN_1V8)
1.8V Regulator Enable "L" Voltage
(EN_1V8)
Max
Unit
300
mA
1.0
VIN_3V3
0.25
Table 8. Internal 1.8V regulator
WizFi 210 User Manual (WIZnet Co., Ltd.)
RF Specification
Specification
Modulation Technique
Data Rate
Description
DSSS for 1, 2Mbps
CCK for 5.5, 11Mbps
IEEE 802.11b: 1, 2, 5.5 and 11Mbps
-84dBm ± 1dB @ 11Mbps
Receive Sensitivity
-88dBm ± 1dB @ 5.5Mbps
-90dBm ± 1dB @ 2Mbps
-94dBm ± 1dB @ 1Mbps
Transmit power (Average)
802.11b : 17dBm ± 1.5dB @ 11Mbps
USA: 2.400 ~ 2.483GHz
Frequency Range
Europe: 2.400 ~ 2.483GHz
Japan: 2.400 ~ 2.497GHz
China: 2.400 ~ 2.483GHz
USA/Canada: 11 (1~11)
Major Europe Countries: 13 (1~13)
Operating Channels
France: 4 (10~13)
Japan: 14 for IEEE 802.11b (1~13 or 14th),
13 for IEEE 802.11g (1~13)
Korea/China: 13 (1~13)
U.FL External Antenna Support
Antenna
External Antenna Pad Support
1dBi Chip Antenna (Optional)
Table 9. RF Specification
WizFi 210 User Manual (WIZnet Co., Ltd.)
(8) Block Diagram
Figure 1. Block Diagram
WizFi 210 User Manual (WIZnet Co., Ltd.)
(9) Pin Description
Figure 2. Pin description
PIN
NAME
I/
IN BIAS
DESCRIPTION
GND
NA
Ground
JTAG_TCK (*)
Pull-up
Joint Test Action Group Test Clock
JTAG_TDO (*)
NA
Joint Test Action Group Test Data Out
JTAG_TDI (*)
Pull-up
Joint Test Action Group Test Data In
JTAG_TMS (*)
Pull-up
Joint Test Action Group Test Mode Select
JTAG_NTRST (*)
Pull-up
ALARM1
Pull-down
RTC_OUT1 (*)
NA
VBAT
NA
WizFi 210 User Manual (WIZnet Co., Ltd.)
Joint Test Action Group Test Mode Reset
Active Low
Embedded Real Time Clock Wake Up Input
Embedded Real Time Clock Wake Up
Output 1
Embedded Real Time Clock Power Supply
10
10
DC_DC_CNTL
NA
11
ALARM2 (*)
Pull-down
12
ADC1 (*)
NA
General Analog to Digital Converter 1
13
ADC2 (*)
NA
General Analog to Digital Converter 2
14
MSPI_MISO/GPIO
6 (*)
Pull-down
15
MSPI_MOSI/GPIO
7 (*)
Pull-down
16
MSPI_CLK/GPIO5
(*)
Pull-down
17
VOUT_1V8 (*)
NA
Internal 1.8V Vout
18
GND
NA
Ground
19
MSPI_CS0/GPIO4
(*)
Pull-down
20
MSPI_CS1/GPIO13
(*)
Pull-down
21
I2C_CLK/GPIO9 (*)
IO
Pull-down
22
PWM0/GPIO10
Pull-down
23
GPIO19/CLK_44M
Hz (*)
Pull-down
24
GPIO20/CLK_22M
Hz (*)
Pull-down
25
GPIO21/CLK_11M
Hz (*)
Pull-down
26
I2C_DATA/GPIO8
(*)
IO
Pull-down
27
SSPI_MISO (*)
Pull-up
28
SSPI_CLK (*)
Pull-up
SPI Slave Clock Input from the HOST
29
SSPI_CS (*)
Pull-up
SPI Slave Chip Select Input from the HOST
WizFi 210 User Manual (WIZnet Co., Ltd.)
VIN_3V3 Regulator Control Output
Embedded Real Time Clock Wake Up Input
Master Serial Peripheral Interface Bus Data
Input / General Purpose Input Output
Master Serial Peripheral Interface Bus Data
Output / General Purpose Input Output
Master Serial Peripheral Interface Bus Clock
/ General Purpose Input Output
Master Serial Peripheral Interface Bus Chip
Select 0 / General Purpose Input Output
Master Serial Peripheral Interface Bus Chip
Select 1 / General Purpose Input Output
Inter-Integrated Circuit Clock / General
Purpose Input Output
Pulse Width Modulator / General Purpose
Input Out-put
Internal Clock Circuitry Test Point / General
Purpose Input Output
Internal Clock Circuitry Test Point / General
Purpose Input Output
Internal Clock Circuitry Test Point / General
Purpose Input Output
Inter-Integrated Circuit Data / General
Purpose Input Output
SPI Slave Transmit Data Output to the
HOST
11
SPI Slave Receive Data Input from the
30
SSPI_MOSI (*)
Pull-down
31
GND
NA
Ground
32
VIN_3V3
NA
Single Supply Port
33
EN_1V8
NA
34
VDDIO(**)
NA
35
EXT_RESETN (*)
IO
Pull-up
36
UART1_CTS/GPIO
26 (*)
HOST
Internal 1.8V regulator enable port-Active
High
All I/O voltage domain (can be tied to
VIN_3V3 or tied to HOST I/O supply)
Module Hardware Reset Input and Power
Supply Reset Monitor Indictor
Universal Asynchronous Receiver
Pull-down
Transmitter 1 Clear to Send Input / General
Purpose Input Output
Universal Asynchronous Receiver
37
UART1_RTS/GPIO2
Pull-down
Transmitter 1 Request to Send Output /
General Purpose Input Out-put /
Firmware Program Mode
38
39
UART1_RX/GPIO3
(*)
UART1_TX/GPIO2
(*)
Universal Asynchronous Receiver
Pull-down
Transmitter 1 Receive Input / General
Purpose Input Output
Universal Asynchronous Receiver
Pull-down
Transmitter 1 Transmitter Output / General
Purpose Input Output
Universal Asynchronous Receiver
40
UART0_TX/GPIO1
Pull-down
Transmitter 0 Transmitter Output / General
Purpose Input Output
41
UART0_RTS/GPIO2
Universal Asynchronous Receiver
Pull-down
Transmitter 0 Request to Send Output /
General Purpose Input Out-put
Universal Asynchronous Receiver
42
UART0_RX/GPIO0
Pull-down
Transmitter 0 Receive Input / General
Purpose Input Output
43
UART0_CTS/GPIO
24
Universal Asynchronous Receiver
Pull-down
WizFi 210 User Manual (WIZnet Co., Ltd.)
Transmitter 0 Clear to Send Input / General
Purpose Input Output
12
44
GPIO31
IO
Pull-down
General Purpose Input Output
45
GPIO30
IO
Pull-down
General Purpose Input Output
46
GPIO29 (*)
IO
Pull-down
General Purpose Input Output
47
GPIO28
IO
Pull-down
General Purpose Input Output
48
GND
NA
Ground
49
EXT-ANT
IO
NA
External Antenna pad
Table 10. Pin description
(*) is not available in this version.
(**) To allow for design flexibility and support for multiple sensors with different voltages,
the VDDIO banks are split, such that some of the VDDIO banks can be 1.8 V and some can
be 3.3 V. If a VDDIO bank is connected to 1.8 V then the corresponding I/O signals for that
bank should be driven at the same voltage.
VDDIO Bank 1 : GPIO28~29, JTAG,
VDDIO Bank 2 : SPI1(Master), Misc
VDDIO Bank 3 : GPIO18~23, PWM
VDDIO Bank 4 : I2C, SPI2(Slave), GPIO16~17
VDDIO Bank 5 : UART0~1
VDDIO Bank 6 : GPIO30~31
WizFi 210 User Manual (WIZnet Co., Ltd.)
13
(10) Module Dimension
Figure 3. Module dimension
WizFi 210 User Manual (WIZnet Co., Ltd.)
14
(11) Recommend Pad Dimension
Figure 4. Recommend Pad Dimension
(12) LED Indications
Condition
D3(PWR)
D1(GPIO 30)
D2(GPIO 31)
D4 (GPIO 28)
ON Solid
Power On
Serial-To-WiFi OK
Associated
Blink(-1-)
Blink(-1-1-)
OFF
No Power
Serial Data Rx
(Data Mode)
Serial Data Rx
Serial-To-WiFi Error
Not Associated
(AT Command Mode)
Table 11. LED Indications
WizFi 210 User Manual (WIZnet Co., Ltd.)
15
Application Guide
(1) AP Scanning
The Serial2WiFi interface can instruct the Wi-Fi radio to scan for access points and ad hoc
networks with a specified SSID, BSSID and/or channel for a specified scan time. Scanning
can be performed to find networks with a specific SSID, BSSID, networks operating on a
specific radio channel, or a combination of these constraints.
(2) Network Connection Management
The connection management module is responsible for processing connection-related
events. The interface provides UDP and TCP sockets (similar to the familiar BSD network
sockets). Each socket may represent either a server or client connection. Each such
connection has a unique, single-digit hexadecimal value (0 to 15) for the CID. The allowed
maximum number of connections (up to 16) may be specified at compile time. Note that
this single pool of CID‟s is used for TCP, UDP, Server and Client connections
(3) Auto Connection Operation
Auto Connecttion acts as a cable replacement insofar that the interface acts like a serial
interface and no commands or user intervention are required for connection management.
In this mode, the Station automatically builds the wireless and network connections by using
parameter values from the current active Profile, then transfers data transparently between
the Host and Target in data mode. No status information is sent to the Host.
The operation modes of WizFi220 are as below
Command Mode : in which data is interpreted as commands to control WizFi220
Data Mode : in which serial data is sent to the WiFi interface
In Data mode the Adapter:
► Receives characters from the serial port and transmits them over the connection
► Receives data from the connection and transmits it on the serial port
The serial host may gain control of the interface by issuing the escape sequence “+++”,
followed by a one-second gap where no characters are received on the serial port. When
this sequence is encountered, the Adapter exits data mode and resumes command
processing. The host then makes changes in the network configuration or other parameters
WizFi 210 User Manual (WIZnet Co., Ltd.)
16
as needed. However, the Adapter does not accept any new TCP/UDP client/server or data
connection requests.
The ATO command (terminated by the ASCII character “O”, not the number 0) is used to
return to data mode.
Applying the “AT+XEHT=1” command (Enable Hardware Trigger), you can change between
data mode and command mode using GPIO 10, without escape sequence (“+++”).
Using D2(GPIO 31), D4(GPIO 28) of WizFi220, you can see if the WizFi220 is associated to
the AP and if serial-to-wifi network channel is normal.
And applying the “AT+XDUM=1” command (Disable UART Message), all UART messages are
blocked in data mode. In this situation, you have to check the signal of GPIO 28 and GPIO
31 to know disassociation or network connection closed.
In data mode, the Nagle Algorithm Wait Time can be used to buffer any characters to be
sent, in order to avoid sending a large number of packets with small payloads onto the
network. The wait time is specified in units of 10 milliseconds. This functionality is available
for both UDP and TCP connections.
(4) Response Codes
The possible responses sent by the Adapter to the serial host are described below.
The Response Codes can be distinguished into codes resulting from the AT Command or
not. There are Carriage Return(\r, 0x0d) and Line Feed(\n, 0x0a) above and below ASCII
STRING. If you send “at” string and Line Feed to the WizFi220,
at + Line Feed (0x61 0x74 0x0d)
You can see the following data.
at + Line Feed (0x61 0x74 0x0d) + \r\n[OK]\r\n (0x0d 0x0a 0x5b 0x4f 0x4b 0x5d 0x0d 0x0a)
No
ASCII
CHAR
Response
ASCII STRING
Meaning
S2W_SUCCESS
[OK]
Command Request Success.
S2W_FAILURE
[ERROR]
Command Request Failed.
S2W_EINVAL
[ERROR: INVALID INPUT]
Invalid Command or Option or
Parameter.
S2W_SOCK_FAIL
[ERROR: SOCKET FAILURE]
Socket Operation Failed.
S2W_ENOCID
[ERROR: NO CID]
All allowed CID’s in use, so there
was no CID to assign to the new
WizFi 210 User Manual (WIZnet Co., Ltd.)
17
connection.
S2W_EBADCID
[ERROR: INVALID CID]
Invalid Connection Identifier.
S2W_ENOTSUP
[ERROR: NOT SUPPORTED]
Operation or Feature not
supported.
S2W_CON_SUCCESS
[CONNECT  ]
TCP/IP connection successful.
 = the new CID in
hexadecimal format.
S2W_ECIDCLOSE
[DISCONNECT ]
TCP/IP connection with the given
CID is closed. This response is sent
to the host when a connection is
closed either by the remote device
or by the serial host.
10
S2W_LINK_LOST
[DISASSOCIATED]
Not associated to a wireless
network.
11
S2W_DISASSO_EVT
[Disassociation Event]
Wireless network association lost.
Table 12. Response Codes
(5) Use of GPIO10
If you click the GPIO10 button twice consecutively, the WizFi220 is restored to factory
default. And if you click the GPIO10 button three times consecutively, the WizFi220 is
restored to factory default and will change to ad hoc mode to configure the WizFi220 via
WiFi. (IP:192.168.1.254/Subnet:255.255.255.0/Gateway:192.168.1.1)
Figure 5. Factory Default and ad hoc mode
As previously described, GPIO10 is used for data/command mode transition by applying
“AT+XEHT=1” command. But there should be no UART input in 300mS before and after
sending signal to GPIO10 for mode transition time and buffer processing time.
WizFi 210 User Manual (WIZnet Co., Ltd.)
18
(6) AT Command example
AT Command examples are described below. In this sample application, the WizFi220
associate to the AP and open the serial-to-wifi channel automatically after reboot.
Description of each command is in the next chapter.
No
10
MCU → WizFi220
WizFi220 → MCU
(AT Command)
(Echo and Result String)
AT+WD
AT+WD
Description
Disassociate
[OK]
AT+WWPA=12345678
AT+WWPA=12345678
Set WPA passphrase
[OK]
AT+NDHCP=1
AT+NDHCP=1
Enable DHCP
[OK]
AT+WAUTO=0,WizFiAP,,0
AT+WAUTO=0,WizFiAP,,0
Set WiFi Configuration
[OK]
AT+NAUTO=1,1,,4000
AT+NAUTO=1,1,,4000
TCP Server Mode(4000)
[OK]
ATC1
AT+XEHT=0
ATC1
[OK]
Auto Connect on next
reboot
AT+XEHT=0
Disable Hardware Trigger
[OK]
AT+XDUM=1
AT&Y0
AT+XDUM=1
Disable UART Message
[OK]
AT&Y0
Set Default Profile
[OK]
AT&W0
AT&W0
Save Profile
[OK]
Table 13. AT Command Example
WizFi 210 User Manual (WIZnet Co., Ltd.)
19
3. AT Commands
This section provides a list of Serial2WiFi commands and their effects. Parameters are
generally ASCII characters, e.g. ATEn with n=1 is the series of ASCII characters ‘A’, ‘T’, ‘E’, and
‘1’. Where some parameters are optional, mandatory parameters are denoted by < > and
optional parameters by [ ]. If a parameter is mandatory, any associated sub-parameters are
also mandatory; sub-parameters of an optional parameter are optional. Parameters must
always be provided in the order given in the command description. When an optional
parameter is not supplied, the comma delimiters must still be included in the command.
Every command starts with the characters “AT”; any other initial characters will cause an
error to be returned.
Command Response: In most cases, valid commands return the characters OK. Invalid inputs
return ERROR: INVALID INPUT.
Some commands may be not supported depending on the version
(1) Command interface
Command
Parameters
Responses / Effects
AT
ATE
“OK”
n=0 (disable) =1 (enable)
IF 1, echo all input.
Ex) ATE0, ATE1
IF 1 responses are ASCII, else numerical
ATV
n=0 (disable) =1 (enable)
codes.
Ex) ATV0, ATV1
Table 14. Command interface
(2) UART / adapter interface configuration
Command
Parameters
Responses / Effects
UART parameters are immediately reset to
values provided.(9600, 19200, 38400, 57600,
115200, 230400)
ATB
[[,]
[,][,]]
Parity is n for no parity, e for even parity and
o for odd parity.
Allowed values are 5, 6, 7 or 8 bits/character,
with 1 or 2 stop bits (1.5 in the case of a 5-bit
character).
Ex) ATB=9600,8,n,1
WizFi 210 User Manual (WIZnet Co., Ltd.)
20
AT&K
n=0 (disable) =1 (enable)
AT&R
n=0 (disable) =1 (enable)
IF 1, software flow control is enabled.
Ex) AT&K0, AT&K1
IF 1, hardware flow control is enabled.
Ex) AT&R0, AT&R1
Sets various timeout values;
0 (Network Connection Timeout,
10 milliseconds, 1~65535, default 1000)
1 (Auto Associate Timeout
10 milliseconds, 0~65535, default 500)
2 (TCP Connection Timeout
ATS
n=0 to 5; p=(parameter value)
10 milliseconds, 0~65535, default 500)
3 (Association Retry Count
Not currently supported)
4 (Nagle Algorithm Wait Time
10 milliseconds, 0~65535, default 10)
5 (Scan Time
1 milliseconds, 0~65535, default 20)
Ex) ATS0=1000, ATS1=500
Various Adapter ID information;
0 (OEM identification)
ATI
n=0 to 2;
1 (Hardware version)
2 (Software version)
Ex) ATI0, ATI2
Table 15. Uart / adapter interface configuration
(3) Profile management
Command
Parameters
Responses / Effects
AT&W
n=0 (profile 0) =1 (profile 1)
ATZ
n=0 (profile 0) =1 (profile 1)
AT&Y
n=0 (profile 0) =1 (profile 1)
AT&F
Save profile specified by n.
Ex) AT&W0
Load profile specified by n.
Ex) ATZ0
Set default profile to the value n.
AT&Y0
Restore profile to factory default values.
Current and saved profile parameter values as
AT&V
ASCII.
Table 16. Profile management
WizFi 210 User Manual (WIZnet Co., Ltd.)
21
(4) Wi-Fi interface
Command
Parameters
Responses / Effects
AT+NMAC=?
Returns the current adapter MAC address.
AT+NMAC2=?
Returns the current adapter MAC address.
0: FCC
AT+WREGDO
MAIN=
: supported Channel range is 1 to 11.
1: ETSI : supported Channel range is 1 to 13.

2: TELEC : supported Channel range is 1 to 14.
Ex) AT+WREGDOMAIN=?
AT+WREGDOMAIN=2
Network scan, returns list of found networks
in the format:
AT+WS=
[[,][,][,<
,,,,,
Scan Time>]]

Ex) AT+WS
AT+WS=,,6
AT+WM=
n=0 (infrastructure) =1 (ad hoc)
Set 802.11 Station operating mode.
Ex) AT+WM=0
Associate to specified SSID, BSSID, and
AT+WA=
[,[][,]]
channel.
Ex)AT+WA=WizFiDemoAP
AT+WD
Disassociate from the current network.
ATH
Disassociate from the current network.
Associate to an AP using WPS
AT+WWPS=
METHOD is push button (1) or pin (2).
[,PIN]
PIN is the pin for PIN method.
AT+WWPS=2,12345670
AT+NSTAT=?
Current wireless and network configuration.
Adapter reports the current network
AT+WSTATUS
configuration to the serial host
AT+WRSSI=?
Current RSSI as ASCII.
AT+WRATE=?
Current transmit rate as ASCII.
AT+WRETRY=
Value of 802.11 TX retry is reset.

Ex) AT+WRETRY=5
Table 17. Wi-Fi interface
(5) Wi-Fi security
Command
Parameters
WizFi 210 User Manual (WIZnet Co., Ltd.)
Responses / Effects
22
Authentication mode setting;
0 : None
AT+WAUTH=
n=0 to 2
1 : Open
2 : Shared with WEP
Ex) AT+WAUTH=0
WEP key n is set to the value in .
AT+WWEPn=
n=1 to 4, 
Ex) AT+WWEP1=123456abdc
AT+WWEP3=abcdef12345678901234567890
WPA passphrase set to the value in
AT+WWPA=
.

Ex) AT+WWPA=12345678
AT+WPAPSK=
,
Computes and stores the WPA2 PSK value.
Ex) AT+WPAPSK=WizFiDemoAP,12345678
Sets the WPA2 pre-shared key to the .
AT+WPSK=

Ex)AT+WPSK=00010203040506070809000102
03040506070809000102030405060708090001
Set the Outer authentication, Inner
authentication, user name and password for
EAP Security. This command returns the
normal response codes.
The valid outer authentication values are:
AT+
WEAPCONF=
,,,
Eap-TLS: 13

Eap-TTLS: 21
Eap-PEAP: 25
The valid Inner Authentication values are:
Eap-MSCHAP: 26
Eap-GTC: 6
Ex) AT+WEAPCONF=43,26,guest,1234
Configure certificate for EAP-TLS
Type: CA certificate(0)/ Client certificate(1)/
,,,
W 
Private Key(2)
Format: Binary(0)/Hex(1)
Size: size of the file to be transferred.
Location: Flash(0)/Ram(1)
Ex) AT+WEAP=2,0,100,0 (cont.)
W<..data..>
Table 18. Wi-Fi security
WizFi 210 User Manual (WIZnet Co., Ltd.)
23
(6) Wireless configuration
Command
Parameters
Responses / Effects
AT+WRXACTIVE=
n=0 (disable) =1 (enable)
AT+WRXPS=
n=0 (disable) =1 (enable)
AT+MCSTSET=
n=0 (disable) =1 (enable)
AT+WP=
 8(Max) to 15(Min)
AT+WSYNCINTRL=
 1 to 65535.
AT+EXTPA=
n=0 (disable) =1 (enable)
AT+PSPOLLINTRL=
 1 to 65535.
If 1, 802.11 radio is enabled.
Ex) AT+WRXACTIVE=1
If 1, Power Save mode is enabled.
Ex) AT+WRXPS=1
If 1, multicast reception is enabled.
Transmit power set to .
Ex) AT+WP=0
Configure the sync loss interval
Ex) AT+WSYNCINTRL=30
Enable/disable the external PA
Ex) AT+EXTPA=0
Configure the keep-alive timer interval
Ex) AT+PSPOLLINTRL=45
Table 19. Wireless configuration
(7) Network interface
Command
Parameters
Responses / Effects
AT+NDHCP=
n=0 (disable) =1 (enable)
If 1, DHCP is enabled.
Static network parameters; overrides previous
AT+NSET=
,,

values.
Ex)
AT+NSET=192.168.3.100,255.255.255.0,192.168
.3.1
AT+DNSLOOK
UP=
AT+DNSSET=
Query DNS server for address of hostname
,[,[]
URL.
Ex) AT+DNSLOOKUP=google.com
,[]
Set the DNS server addresses to be used.
Ex) AT+DNSSET=192.168.3.1
AT+STORENW
Store network connection parameters prior to
CONN
transition to Standby.
AT+RESTOREN
Restore network connection parameters after
WCONN
wake from Standby.
Table 20. Network interface
WizFi 210 User Manual (WIZnet Co., Ltd.)
24
(8) Connection management
Command
Parameters
Responses / Effects
Attempt TCP client connection to Destination;
AT+NCTCP=
,
CONNECT  if successful.
Ex) AT+NCTCP=192.168.3.200,5000
AT+NCUDP=
,
[<,Src.Port>]
Open UDP client socket to Destination;
CONNECT  if successful.
Ex) AT+NCUDP=192.168.3.200,5000
Start a TCP server on Port; CONNECT  if
AT+NSTCP=

successful.
Ex) AT+NSTCP=5000
UDP server on Port; CONNECT  if
AT+NSUDP=

successful.
Ex) AT+NSUDP=5000
AT+CID=?
AT+NCLOSE=
Returns the current CID configuration.

AT+NCLOSEAL
Close connection identified by CID.
Ex) AT+NCLOSE=1
Close all open connections.
AT+SETSOCKO
,,,,
AT+SSLOPEN=
,
Open an SSL connection

Close an SSL connection
,
Configure an HTTP client
AT+SSLCLOSE
AT+HTTPCCO
NF=
Configure a socket which is identified by a Cid
Open an HTTP client connection. This
AT+HTTPCOPE
,, [,]
adaptor and connects to the server specified
by the host name or IP address
AT+HTTPCSEN
,,,
GET/POST HTTP data on the HTTP client
D=
,[Size of content]
connection

Close the HTTP client connection
<0|1|2>
Enable / Disable Raw Ethernet support.
AT+HTTPCCLO
SE=
AT+NRAW=
AT+UNSOLICIT
EDTX=
,,,,, ,,
Table 21. Connection management
(9) Battery check
Command
AT+BCHKSTRT
Parameters
Responses / Effects
Start checking battery

each 0 < Batt.chk.freq≤ 100 packets
transmitted.
AT+
,,
AT+BCHK=

Set the battery warning/standby level to
enable the adaptor’s internal battery
measuring logic
Reset value of battery check frequency.
AT+BCHKSTOP
Stop checking battery.
AT+BATTVALG
Retrieve the most recent battery check value.
ET
Table 22. Battery check
(10) Power state management
Command
Parameters
Responses / Effects
AT+PSDPSLEE
Enable SOC Deep Sleep power saving mode.
Request transition to Standby for x
AT+PSSTBY=
[,,,]
Ex) AT+PSSTBY=60000,1000,1,1
AT+PSSTBY=5000
Table 23. Power state management
(11) Auto connection
Command
Parameters
Responses / Effects
Sets WiFi parameters to be used for Auto
AT+WAUTO=
,,,[channel
Connect.
Mode is 0 for Infrastructure and 1 for Ad-hoc
mode
Ex) AT+WAUTO=0,WizFiDemoAP
Sets network parameters to be used for Auto
AT+NAUTO=
,,,
Type is 0 for Client and 1 for Server;
Protocol is 0 for UDP and 1 for TCP;
WizFi 210 User Manual (WIZnet Co., Ltd.)
26
Ex) AT+NAUTO=0,1,192.168.3.101,5000
(TCP/Client)
AT+NAUTO=1,1, ,5001 (TCP/Server)
AT+NAUTO=0,0,192.168.3.101,5002
(UDP, Local/Remote Port is 5002)
ATC
n=0 (disable) =1 (enable)
IF 1, Auto Connect is enabled on next reboot
or AT.
ATA
Start Auto Connect, including association.
ATA2
Start Auto Connect using existing association.
Return to a previous Auto Connect session;
ATO
returns an error if no such session exists.
Table 24. Auto connection
(12) Provisioning
Command
Parameters
Responses / Effects
,
Provisioning through web pages
AT+WEBLOGO
 maximum size is 1788
Adding the Logo that will appear on the web
ADD=
bytes
pages used for provisioning.
AT+WEBPROV
Table 25. Provisioning
(13) Miscellaneous
Command
AT+FWUP=
AT+SETTIME=
Parameters
,,,[]
,
Responses / Effects
Get a firmware upgrade from the server
address/port to the adapter port SrcPort.
Ex) AT+FWUP=192.168.3.200,667,667
Set the adaptor system time
Upon reception of this command the adaptor
sends the current system time in milliseconds
since
AT+
epoch(1970) to the serial interface. The time
GETTIME=?
format comes on the serial interface as
follows:
“Current Time in msec since epoch=xxxxxxx”
AT+DGPIO=
,
AT+VER=?
AT+PING=
Set or reset (high/low) a GPIO pin
Ex) AT+DGPIO=31,0
Return the current adapter firmware versions.
,[[Trails],[],[],[
WizFi 210 User Manual (WIZnet Co., Ltd.)
PING the IP address provided. Trails = 0 will
27
],[],[]]
ping until  C is issued.
Ex) AT+PING=192.168.3.1,5
AT+TRACERO
,[[Interval],[],[],[]]
Ex) AT+TRACEROUTE=74.125.155.103
AT+XDUM=
n=1 (disable) =0 (enable)
AT+XEHT=
n=0 (disable) =1 (enable)
If 1, UART Message is Disabled.(When Auto
Connection Mode)
If 1, Hardware Trigger is Enabled.
Table 26. Miscellaneous
WizFi 210 User Manual (WIZnet Co., Ltd.)
28
4. Hardware Installation
Please follow the instruction to install your WizFi220 Wi-Fi module on your system:
Your PCB comes with a SMD PADs, which allows the system to SMT WizFi220 Wi-Fi module
for using Wireless LAN (IEEE802.11b).
Step 1: Mount the Wi-Fi module on your PCB
Step 2: Connect the antenna.
You have just completed the Wireless LAN hardware installation. When you boot up the
system , you should expect to see the wireless LAN connection capacity.
This device is intended only for OEM integrators under the following conditions:
1) The antenna must be installed such that 20 cm is maintained between the antenna
and users, and
2) The transmitter module may not be co-located with any other transmitter or antenna,
3) For all products market in US, OEM has to limit the operation channels in CH1 to CH11
for 2.4G band by supplied firmware programming tool.
OEM shall not supply any tool or info to the end-user regarding to Regulatory
Domain change.
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.
NOTE: In the event that these conditions cannot be met (for example certain laptop
configurations or co-location with another transmitter), then the FCC authorization is
no longer considered valid and the FCC ID 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.
WizFi 210 User Manual (WIZnet Co., Ltd.)
29
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:
XR2WIZFI220.”
To comply with FCC RF exposure compliance requirements, the antenna used for this
transmitter must be installed to provide a separation distance of at least 20 cm from all
persons and must not be co-located or operating in conjunction with any other antenna
or transmitter.
WizFi 210 User Manual (WIZnet Co., Ltd.)
30
5. Warranty
WIZnet Co., Ltd offers the following limited warranties applicable only to the original
purchaser. This offer is non-transferable.
WIZnet warrants our products and its parts against defects in materials and workmanship
under normal use for period of standard ONE(1) YEAR for the WizFi220 board and labor
warranty after the date of original retail purchase. During this period, WIZnet will repair or
replace a defective products or part free of charge.
Warranty Conditions:
1.
The warranty applies only to products distributed by WIZnet or our official
distributors.
2.
The warranty applies only to defects in material or workmanship as mentioned
above in 3.Warranty. The warranty applies only to defects which occur during
normal use and does not extend to damage to products or parts which results from
alternation, repair, modification, faulty installation or service by anyone other than
someone authorized by WIZnet Co., Ltd. ; damage to products or parts caused by
accident, abuse, or misuse, poor maintenance, mishandling, misapplication, or used
in violation of instructions furnished by us ; damage occurring in shipment or any
damage caused by an act of God, such as lightening or line surge.
Procedure for Obtaining Warranty Service
1.
Contact an authorized distributors or dealer of WIZnet Co., Ltd. for obtaining an
RMA (Return Merchandise Authorization) request form within the applicable
warranty period.
2.
Send the products to the distributors or dealers together with the completed RMA
request form. All products returned for warranty must be carefully repackaged in the
original packing materials.
3.
Any service issue, please contact to sales@wiznet.co.kr
WizFi 210 User Manual (WIZnet Co., Ltd.)
31
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