ShenZhen HLK 7628N User Manual

ShenZhen HaiLingKe Electronic co., Ltd

HLK-7628N User Manual

ETHERNET

WIFI

Full function serial network/wifi module

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Directory

1 BRIEF INTRODUCTION ............................................................................................................................................ 5

2 SUMMARIZE ................................................................................................................................................................ 5

2.1

TECHNICAL SPECIFICATIONS ..................................................................................................................................... 5

2.2

HARDWARE EXPLANATION ........................................................................................................................................ 6

2.2.1 Mechanical Dimensions ................................................................................................................................... 6

3 QUICK START .............................................................................................................................................................. 7

3.1

FACTORY RESETTING ................................................................................................................................................. 7

3.2

CONFIGURATION NETWORK PARAMETER ................................................................................................................... 7

3.3

CONFIGURATION SERIAL NETWORK PARAMETER ....................................................................................................... 7

4 FUNCTION DESCRIPTION ....................................................................................................................................... 7

4.1

SERIAL TO ETHERNET ............................................................................................................................................... 8

4.2

SERIAL TO WIFI CLIENT ......................................................................................................................................... 8

4.3

SERIAL TO WIFI AP .................................................................................................................................................. 9

4.4

DEFAULT MODE ...................................................................................................................................................... 10

4.5

SERIAL WORK MODE SWITCHING ............................................................................................................................. 10

4.6

SERIAL-NETWORK DATA CONVERSION ..................................................................................................................... 11

4.7

PARAMETER CONFIGURATION DIRECTION ................................................................................................................ 13

5 WEB CONFIGURA TIO N ........................................................................................................................................... 14

5.1

WEB NETWORK CONFIGURATION ........................................................................................................................... 14

5.1.1 Serial to Ethernet- dynamic ip........................................................................................................................ 15

5.1.2 Serial to Ethernet - static ip ........................................................................................................................... 15

5.1.3 Serial to WIFI CLIENT- dynamic ip ............................................................................................................... 15

5.1.4 Serial to WIFI CLIENT- static ip .................................................................................................................... 16

5.1.5 Serial to WIFI AP ........................................................................................................................................... 16

5.2

WEB SERIAL PORT CONFIGURATION ........................................................................................................................ 16

5.3

COMMIT CHANGERS ................................................................................................................................................ 18

6 SERIAL AT COMMAND CONFIGURATION ........................................................................................................ 18

6.1

ENTER AT COMMAND MODE.................................................................................................................................... 18

6.2

AT COMMAND ......................................................................................................................................................... 18

6.2.1 netmode .......................................................................................................................................................... 20

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6.2.2 wifi_conf ......................................................................................................................................................... 20

Channel

6.2.3

6.2.4 dhcpc .............................................................................................................................................................. 21

6.2.5 net_ip .............................................................................................................................................................. 22

6.2.6 net_dns ........................................................................................................................................................... 22

6.2.7 dhcpd .............................................................................................................................................................. 22

6.2.8 dhcpd_ip ......................................................................................................................................................... 22

6.2.9 dhcpd_dns ...................................................................................................................................................... 23

6.2.10 dhcpd_time ................................................................................................................................................... 23

6.2.11 net_c ommit ................................................................................................................................................... 23

6.2.12 out_trans ...................................................................................................................................................... 24

6.2.13 remoteip ........................................................................................................................................................ 24

6.2.14 re moteport .................................................................................................................................................... 24

6.2.15 remotepro ..................................................................................................................................................... 24

6.2.16 timeout .......................................................................................................................................................... 25

6.2.17 mode ............................................................................................................................................................. 25

.......................................................................................................................................................... 21

6.2.18 uart ............................................................................................................................................................... 25

6.2.19 uartpacklen ................................................................................................................................................... 26

6.2.20 uartpacktimeout ............................................................................................................................................ 26

6.2.21

escape

.......................................................................................................................................................... 26

6.2.22

tcp_auto

6.2.23 save ............................................................................................................................................................... 27

6.2.24 reconn ........................................................................................................................................................... 27

6.2.25 ver................................................................................................................................................................. 27

6.2.26 Clport ........................................................................................................................................................... 28

6.2.27 RTS

6.2.28 XON_XOFF.................................................................................................................................................. 28

6.2.29 net_wanip ..................................................................................................................................................... 28

6.2.30 tcp_client_check ........................................................................................................................................... 29

6.2.31 S2N_Stat ....................................................................................................................................................... 29

6.2.32 Get_MAC ..................................................................................................................................................... 29

...................................................................................................................................................... 26

（

This function has not been implemented yet） ................................................................................ 28

6.2.33 wifi_ConState ............................................................................................................................................... 29

6.2.34 wifi_Scan ...................................................................................................................................................... 30

6.2.35 suspend ......................................................................................................................................................... 30

6.2.36 C2_remoteip ................................................................................................................................................. 30

6.2.37 C2_re m oteport ............................................................................................................................................. 30

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6.2.38 C2_remotepro ............................................................................................................................................... 31

6.2.39 C2_timeout ................................................................................................................................................... 31

6.2.40 C2_mode ...................................................................................................................................................... 31

6.2.41 C2_uart ........................................................................................................................................................ 32

6.2.42 C2_uartpacklen ............................................................................................................................................ 32

6.2.43 C2_uartpacktimeout ..................................................................................................................................... 32

6.2.44 C2_

tcp_auto

............................................................................................................................................... 32

6.2.45 C2_tcp_client_check .................................................................................................................................... 33

6.3

AT COMMAND CONTROL CODE ROUTINE.............................................................................................................................. 33

6.3.1 Configuration information query ................................................................................................................... 33

6.3.2 Serial to Ethernet (dynamic ip addr ess) ......................................................................................................... 34

6.3.3 Serial to Ethernet (static ip address) .............................................................................................................. 35

6.3.4 Serial to wifi client(dynamic ip address) ........................................................................................................ 36

6.3.5 Serial to wifi client(static ip address) ............................................................................................................. 37

6.3.6 Serial to wifi AP ............................................................................................................................................. 38

6.3.7 Factory reset .................................................................................................................................................. 39

7 SERIAL CONFIGURATION TOOL ..................................................................................................................................... 39

7.1

SEARCH MODULE .................................................................................................................................................... 41

7.2

SET PREFERENCES ................................................................................................................................................... 41

7.3

SUBMIT CONFIGURATION ......................................................................................................................................... 42

7.4

USER DATA RETENTION ........................................................................................................................................... 43

INQUIRY CONFIGURATION ........................................................................................................................................ 43

7.5

7.6

ENTER TRANSP ARENT TRANSMISSION ..................................................................................................................... 43

7.7

FACTORY RESET ...................................................................................................................................................... 43

8 SEARCHING DEVICE TOOL .................................................................................................................................. 44

9 FACTORY RESET ...................................................................................................................................................... 45

10 UPGRADE FIRMWARE .......................................................................................................................................... 46

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A

A

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1 Brief Introduction

HLK-7628N is a new low-cost embedded UART - ETH - WIFI module developed bu

shenzhen Hi-Link electronic technology co.,ltd.

This product is an embedded module based on the universal serial interface network standard,
built-in TCP/IP protocol stack, enabling the user serial port, Ethernet, wireless network (wifi)
interface between the conversions.

Through the HLK-7628N module, the traditional serial devices do not need to change any
configuration; Data can be transmitted through the internet network. Provide a quick solution for
the user’s serial devices to transfer data via Ethernet.

Serial Com

2 Summarize

2.1 Technical Specifications

Network Standard

Wireless Transmission
Rate

Tracks Number
Frequency range

Emission power

EthernetWIFI（Client/AP）

Picture 1.Function Structure

Table 2-1 Technical Specifications

Wireless：IEEE 802.11n、IEEE 802.11g、IEEE 802.11b
Wired：IEEE 802.3、IEEE 802.3u

11n:Maximum up to 150Mbps
11g:Maximum up to 54Mbps
11b:Maximum uo to 11Mbps

1-14

2.4-2.4835G
12-15DBM

Interface

ntenna
ntenna Type

Functional Parameters

5 Ethernet、2 Serial、1 USB（host/slave）、GPIO

On board antenna /External antenna

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WIFI Work Mode
WDS Function Support WDS wireless bridge connection

Wireless Security

Network Management

Serial to Ethernet

Network Drive/Wireless/Router

Wireless MAC address filtering

Wireless security function switch

64/128/152 bit WEP encryption
WPA - PSK/WPA2 - PSK、WPA/WPA2 security mechanism
Remote Web management

Configuration file import and export

WEB software upgrade

Maximum transmission 500000bps

TCP connection Max connection number>20

UDP connection Max connection number>20

Serial baud rate 1200~500000bps（Support nonstandard bps）

Other parameter
Status indicator light Status indicator

Operating temperature：-20-70℃

Environmental standards

Other performance

Operating humidity：10%-90%RH（non-condensing）
Storage temperature：-40-80℃
Storage humidity：5%-90%RH（non-condensing）
Frequency bandwidth optional：20MHz、40MHz, automatically

2.2 Hardware Explanation

2.2.1 Mechanical Dimensions

HLK-7628N size is shown below：（L*W）=33.2mm*18.7mm*2.2mm

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Note：

1. I/O port electrical level voltage is 3.3V

3 Quick start

3.1 Factory resetting

In order to ensure that all the configuration process correctly, let module restore factory

settings. In factory mode can skip this step. 5V(350mA) to supply power to the module, wait
about 30 seconds after startingthe low WDT/RST pin exceeds Trst, the release of WDT/RST
Pin，the system will automatically restart. The system is already in factory mode.

3.2 Configuration network parameter

Set the PC to static IP mode and then connect it with the module via Ethernet or WIFI. The IP

address is set to 192.168.16.100/255.255.255.0, gateway192.168.16.254.（wifi default and ssid
default password, see this document）open the browser http://192.168.16.254/，enter the web
configuration page，default user name and password is admin/admin. Modity the network
parameter through the web. Now, the module’s IP address is192.168.16.254. Configuration
details can be seen in 5.1.

3.3 Configuration serial network parameter

Open the browser http://192.168.16.254/，enter the serial to network web configuration page.

Configure the serial to network parameter as needed through a wed page. Configuration details can
be seen in 5.2.

4 Function Description

The module can be divided into four modes: default mode, serial to Ethernet, serial to wifi
client, and serial to wifi AP.

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4.1 Serial to Ethernet

HLK-7628NMCU

COM1

DHCP IP
/STATIC IP

ETH1

ETHERNET SERIAL

SWITCH
/ROUTER

Picture 3.Serial to Ethernet model

In this mode，ETH1 enable，WIFI、ETH2 function close. Through the appropriate settings,data

between COM1 and ETH1 network can achieve mutual conversion.

Ethernet can be configured as dynamic IP address（DHCP），can also configured ad static

address（STATIC）.

4.2 Serial to WIFI CLIENT

HLK-7628NMCU WIFI AP

COM1

SERIAL

DHCP IP
/STATIC IP

WIFI
Client

Picture 4.Serial to WIFI CLIENT model

In this mode, WIFI enable, module works in the CLIENT mode, ETH1、ETH2function

close.Through the appropriate settings,data between COM1 and ETH1 network can achieve

mutual conversion.

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WIFI CLIENTcan be configured as dynamic IP address（DHCP），can also configured ad static

address（STATIC）.

WIFI safety: support all encryption methods at present.

4.3 Serial to WIFI AP

SERIAL

HLK-7628NMCU

COM1

DHCP ENABLE

WIFI
AP

WIFI CLIENT

(PHONE、pad)

Picture 5.Serial to WIFI AP model

In this mode, WIFI enable, module works in the AP mode, ETH1、 ETH2function

close.Through the appropriate settings,data between COM1 and ETH1 network can achieve

mutual conversion.

WIFI safety: support all encryption methods at present.

In this mode, WIFI device can connect with the module and become the device under WIFI
LAN.

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4.4 Default Mode

SERIAL

HLK-7628NMCU

COM1

DHCP ENABLE

WIFI
AP

ETH2

ETH1

LAN

WAN

WIFI CLIENT

(PHONE、pad)

Picture 6.Default mode model

In this mode, WIFI enable, module works in the AP mode, ETH1、ETH2function enable.ETH1

works as WAN,ETH2 works as LAN.Through the appropriate settings,data between COM1

and network can achieve mutual conversion.

WIFI safety: support all encryption methods at present.

In this mode, WIFI device can connect with the module and become the device under WIFI
LAN.
WAN default IP is dynamic IP address.LAN、WIFI for the same local area network, enable by
default DHCP server.

4.5 Serial work mode switching

Module serial work status is defined as two modes: transparent transmission mode, the AT
command mode.

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Picture7.Serial work mode switching

After power on normally, the module will check whether the current network serial port
configuration is normal, if the network connection is normal, the module automatically enters.
There are three kinds of methods for transparent mode entering AT command mode:

1.WDT/RST Pin.

In any state, keep WDT/RST pin low time greater than Tes and less than Trst, the module will

immediately enter the AT command mode.

>Tes

WDT/RST

<Trst

t

AT Command

Picture8. WDT/RST Exit transparent transmission mo

4.6 Serial-network data conversion

Serial data conversion divided into 4 modes：TCP Server、TCP Clinet、UDP Server、UDP
Client。

TCP Server

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HLK-7628N

TCP Client

TCP Server

TCP Client

TCP Client

Picture 10.TCP Server

In this mode, the module is listening on the specified port, waiting for TCP client connection,
if connected, all TCP data is sent directly to the serial port end, the data of the serial end sent to
TCP client end.

TCP Client

HLK-7628N

TCP Client

TCP Server

图 11.TCP Client

In this mode, the module is connected to the specified domain /IP port. All the data sent from
the TCP server-side end will be sent directly to the serial port, the data from the serial end sent to
the TCP server-side. abnormal network disconnect will cause the module active reconnect. TCP
active reconnect, and otherwise the module will not reconnect.

UDP Server

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HLK-7628N

UDP Server

UDP Client

图 12.UDP Server

In this mode, module open the specified local port, once received is sent to the data port, and

record the last connection on remote information. Serial port to receive data will be sent directly
to the remote IP,recorded port.

UDP Client

HLK-7628N

UDP Client

UDP Server

图 13.UDP Client

In this mode, the module directly sends the serial data to the specified ip, port. The serial data

returned from the server will be distributed to serial port.

4.7 Parameter configuration direction

The module provides two ways for the configuration parameter：

1.WEB page；

2.Serial AT command.

Access to WEB configuration page requires the confirmation of the module’s IP address, as
well as the user name and password that authenticated by WEB.

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Configure parameter through the serial port AT command needs to make the module into the
AT command mode first.

Serial configuration HLK-7628N_CONFIG: Configure the module through AT command,
provide a easier and convenient configuration process through the configuration combination of
each parameter.

5 WEB configuration

Picture 14.WEB configuration page

Through the correct module address (default addresshttp://192.168.16.254/)you can access to
the web configuration page, the page can be divided onto 3 areas：

1 Network configuration area;
2 Serial function area;
3 Configuration submit area;

5.1 WEB Network configuration

Net mode selection（NetMode）：

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Default – default work mode
ETH -SERIAL – Serial to Ethernet
WIFI(CLIENT)-SERIAL – Serial to WIFI CLIENT
WIFI(AP)-SERIAL) – Serial to WIFI AP

Choose different work mode, the web will show you different page. Mode
configuration page is as follows:

5.1.1 Serial to Ethernet- dynamic ip

Picture 15. Serial to Ethernet- dynamic

5.1.2 Serial to Ethernet - static ip

Picture 16. Serial to Ethernet - static

5.1.3 Serial to WIFI CLIENT- dynamic ip

Picture17. Serial to WIFI CLIENT- dynamic

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5.1.4 Serial to WIFI CLIENT- static ip

Picture18. Serial to WIFI CLIENT- static

5.1.5 Serial to WIFI AP

Picture19. Serial to WIFI AP

5.2 WEB serial port configuration

Serial web configuration is as follows：

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Picture 20. web serial port configuration

Current shows the current configuration,Updated shows the current parameter.

Serial Configure ： Serial configuration. The format is as follows:Mbps,data
bits,parity bit and stop bit.

For example：“115200,8,n,1”。

Serial Framing Lenth：The serial frame length

Serial Framing Timeout：The serial frame time

Network Mode：The network mode.Choose Client、Server or none.

Remote Server Domain/IP：The remote server name or IP address.

For example：192.168.11.245 or www.hlktech.com 。

Locale/Remote Port Number：Local or remote port number.Network mode is different
parameters specified remote port number, server is the specified port number.

Network Protocol：The type of network protocol.Used tcp or udp.

Network Timeout：Network timeout. Server network mode, when there is no data
transmission within the timeout period, the connection will be disconnected. 0
specified never disconnected.

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5.3 Commit changers

Click on the Apply configuration of the current page submission. If the network
parameters have been changed, the submission process may require about 25 seconds.
If only modify the serial port function configuration, the submission process will
finished soon.

Click cancel to reload the page, the modified configuration will be lost/

6 Serial AT command configuration

6.1 Enter AT command mode

6.2 AT command

In AT mode, the configuration parameters of the system can be done through the

serial port AT instruction. The command as follows：

at+[command]=[value]\r

According to the different command module will return different value.For
example：”at+remoteip=192.168.11.133\r”Set the ipaddress is 192.168.11.133。

Foe example ：”at+remoteip=？\r”check the remote ip address.

Command list is as following：

netmode Network model

wifi_conf WiFi configuration

Channel WiFi channel

dhcpc DHCP Client configuration

net_ip Network IP address

net_dns Network DNS address

dhcpd DHCP server configuration

dhcpd_ip DHCP server IP address

dhcpd_dns DHCP server DNS address
dhcpd_time DHCP server allocates time
net_commit Submit network configuration

out_trans Exit transmission

remoteip Remote server domain name or address

remoteport Local or remote port number

remotepro Network protocol type

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timeout Network timeout

mode Serial network mode
uart Serial configuration

uartpacklen Serial frame length

uartpacktimeout Serial frame time

escape Exit serial transmission

tcp_auto TCP automatic reconnect

save Submit serial port configuration and restart service

reconn Restart service

default Factory reset

reboot Restart module

ver Version

CLport TCP/UDP CLIENT local port

RTS Serial output instructions（485）

XON_XOFF XON/XOFF flow control enable

net_wanip wan ip address

tcp_client_check TCP CLIENT remote state detection

S2N_Stat Serial port function

Get_MAC Get MAC address

wifi_ConState WiFi CLIENT connect status

wifi_Scan WiFi scan

suspend System hang up
C2_uart Serial 2 serial configuration
C2_mode Serial 2 serial network mode

C2_remoteip Serial 2 remote server name or IP address

C2_port Serial 2 local or remote port number

C2_CLport Serial 2 TCP/UDP CLIENT local port

C2_protocol Serial 2 network protocol type

C2_timeout Serial 2 network timeout

C2_uartpacklen Serial 2 serial frame length

C2_uartpacktimeout Serial 2 serial frame time

C2_tcp_auto Serial 2 TCP automatic reconnect

C2_tcp_client_check Serial 2 TCP CLIENT remote state detection

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6.2.1 netmode

Function：
Network mode setting.
Form：

at+netmode=<netmode>\r

Parameter：

Network mode

value Meaning

0 Default mode
1 Ethernet
2 WiFi client
3 WiFi AP

6.2.2 wifi_conf

Function：
Wireless setting.
Form：

at+wifi_conf=<ssid>，<encrypt type>, <password> \r

Parameter：

ssid：Network SSID
encrypt type: Encryption

Encryption

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wpawpa2_tkip wpa/wpa2 tkip

wpawpa2_aes wpa/wpa2 aes

password：password

6.2.3 Channel

value Meaning

none Open network

wep_open Wep encryption, open authentication

wep Wep encryption,keyed authentication

wpa_tkip wpa tkip

wpa_aes wpa aes

wpa2_tkip wpa2 tkip

wpa2_aes wpa2 aes

auto Automatic selection

Function：
WiFi Wireless channel choice.
Form：

at+Channel=<Channel>\r

Parameter：

Channel:0-14.（0-automatic selection）

6.2.4 dhcpc

Function：
Dhcp client enable
Form：

at+dhcpc=<dhcpc>\r

Parameter：

Dhcp client enable

value Meaning

0 Static ip address
1 Dynamic ip address

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6.2.5 net_ip

Function：
The network IP sets. This parameter is invalid when DHCP client is working.
Form：

at+Net_ip=<ip>，<mask>，<gateway>\r

Parameter：

Ip：ip address
Mask：subnet mask
Gateway：gateway

6.2.6 net_dns

Function：
The network DNS sets.his parameter is invalid when DHCP client is working.
Form：

at+Net_dns=<dns1>，<dns2>\r

Parameter：

dns1：Primary DNS address
dns2：Secondary DNS address

6.2.7 dhcpd

Function：
DHCP server enable. 网 This parameter is invalid when the network mode not in AP
mode.
Form：

At+dhcpd=<dhpcd>\r

Parameter：

Dhcp Server enable

value Meaning

0 Close
1 Open

6.2.8 dhcpd_ip

Function：
Dhcp server ip setting.

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Form：

At+Dhcpd_ip=<ip start>，<ip end>，<mask>，<gateway>\r

Parameter：

Ip start：ip start address
Ip end：ip cut-off address
Mask：subnet mask
Gateway：gateway

6.2.9 dhcpd_dns

Function：
Dhcp server dns setting.
Form：

At+Dhcpd_dns=<dns1>，<dns2>\r

Parameter：

dns1：Primary dns address
dns2：secondary dns address

6.2.10 dhcpd_time

Function：
Dhcp server timesetting
Form：

At+Dhcpd_time=<time >\r

Parameter：

time：allocate dhcp valid time to device

6.2.11 net_commit

Function：
Submit network setting.All parameters related to network configuration are
required to be committed after this setting. The command execution time takes about
30s.
Form：

At+ Net_commit=< Net_commit >\r

Parameter：

Submit network settings

value Meaning

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0 Disable
1 Refer

6.2.12 out_trans

Function：
Exit the pass through mode. The function of exiting the pass mode cannot actually
be used on the serial port.
Form：

At+out_trans=<out_trans>\r

Parameter：

Submit network settings

value Meaning

0 Enter transparent transmission
1 Exit transparent transmission

6.2.13 remoteip

Function：
Remote ip or domain name setting.
Form：

At+remoteip=< remoteip >\r

Parameter：

Remote server domain name or ip address.

6.2.14 remoteport

Function：
Remote port setting.
Form：
At+ remoteport=<remoteport>\r
Parameter：

Remoteport：Remote port.

6.2.15 remotepro

Function：
Protocol type setting.

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Form：
At+ remotepro=<remotepro>\r
Parameter：

remotepro setting

value Meaning

None None

Tcp Tcp protocol
Udp Udp protocol

6.2.16 timeout

Function：
Network timeout
Form：
At+timeout=<timeout>\r
Parameter：

Network timeout. Under server network mode,When there is no data transfer in the
timeout period, the connection will be disconnected and the.0 specified never
disconnects.

6.2.17 mode

Function：
Convert mode setting
Form：
At+mode=<mode>\r
Parameter：

Mode setting

value Meaning

None None

Client Client
Server Server

6.2.18 uart

Function：
Serial port configuration setting
Form：

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At+uart=<baud>，<data>，<parity>，<stop>\r
Parameter：

Baud：Bps
Data：data bit
Parity：check bit
Stop：stop bit

6.2.19 uartpacklen

Function：
Frame length of serial port group setting.
Form：
At+uartpacklen =<uartpacklen>\r
Parameter：

uartpacklen：Frame length of serial port group（ units：bytes）。

6.2.20 uartpacktimeout

Function：
Group frame time of serial setting
Form：
At+ uartpacktimeout=<uartpacktimeout>\r
Parameter：

uartpacktimeout：Group frame time of serial（Units：ms）。

6.2.21 escape

Function：
Serial port exit transparent transmission enable
Form：
At+ escape=<escape>\r
Parameter：

escape：0 - close，1 - enable

6.2.22 tcp_auto

Function：
TCP automatic reconnection. This function is turned on and the connection will

continue to try to re-establish the connection, regardless of any reason.

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Form：
At+ tcp_auto=<tcp_auto>\r
Parameter：

tcp_auto：0 - Close ，1 - enable

6.2.23 save

Function：
Submit the serial port conversion configuration and restart the service
Form：
At+ save=<save>\r
Parameter：

Submit serial port setting

value Meaning

0 Disable
1 Refer

6.2.24 reconn

Function：
Restart serial conversion service
Form：
At+ reconn =< reconn >\r
Parameter：

Restart serial conversion service

value Meaning

0 Disable
1 Restart serial conversion service

6.2.25 ver

Function：
Firmware version inquiry
Form：
At+ ver =？\r
Parameter：

None.

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6.2.26 Clport

Function：
TCP/UDP CLIENT local port
Form：

At+ CLport=< CLport>\r

Parameter：

Clport：local port number.

6.2.27 RTS （This function has not been implemented yet）

Function：
Serial output indication.In the 485 scenario, a separate pin is usually required

to indicate the reception or transmission status of the 485 transceiver. After this
function is enabled, the GPIO_1 pin indicates the output state of the serial port
as the output pin.

Form：
At+ RTS =< RTS >\r
Parameter：

value Meaning

0 Close
1 Open

6.2.28 XON_XOFF

Function：
XON/XOFF Flow control enable.
Form：
At+ XON_XOFF=< XON_XOFF >\r
Parameter：

RTS

6.2.29 net_wanip

Function：

XON_XOFF

value Meaning

0 Close
1 Open

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wan ip address.
Form：
At+ net_wanip =？\r
Parameter：

无

6.2.30 tcp_client_check

Function：
TCP CLIENT Remote status detection.
Form：
At+ tcp_client_check =< tcp_client_check >\r
Parameter：

tcp_client_check

value Meaning

0 Close
1 Open

6.2.31 S2N_Stat

Function：
Serial function status
Form：
At+ S2N_Stat =？\r
Parameter：
None

6.2.32 Get_MAC

Function：
Get MAC sddress
Form：
At+ Get_MAC =？\r
Parameter：

None

6.2.33 wifi_ConState

Function：

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WiFi CLIENT Connection status
Form
At+ wifi_ConState =？\r
Parameter：

None

6.2.34 wifi_Scan

Function：
WiFi scan
Form：
At+ wifi_Scan =？\r
Parameter：

None

6.2.35 suspend

Function：
System suspension
Form：
At+ suspend =< suspend >\r
Parameter：

suspend

value Meaning

0 Awake
1 Hang up

6.2.36 C2_remoteip

Function：
Serial 2 remote ip or domain setting
Form：

At+ C2_remoteip=< remoteip >\r

Parameter：

Remote server domain name or IP address

6.2.37 C2_remoteport

Function：
Serial 2 remote port setting
Form：

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At+ C2_remoteport=<remoteport>\r
Parameter：

Remoteport：Remote port

6.2.38 C2_remotepro

Function：
Serial port 2 protocol type setting.
Form：
At+ C2_remotepro=<remotepro>\r
Parameter：

Remotepro setting

value Meaning

None None

Tcp Tcp protocol
Udp Udp protocol

6.2.39 C2_timeout

Function：
Serial 2 network timeout
Form：
At+ C2_timeout=<timeout>\r
Parameter：

Network timeout. Under server network mode,When there is no data transfer in the
timeout period, the connection will be disconnected and the.0 specified never
disconnects.

6.2.40 C2_mode

Function：
Serial port 2 conversion mode setting.
Form：
At+ C2_mode=<mode>\r
Parameter：

value Meaning

None None

Mode setting

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Client Client
Server Server

6.2.41 C2_uart

Function：
Serial port 2 serial configuration setting.
Form：
At+ C2_uart=<baud>，<data>，<parity>，<stop>\r
Parameter：

Baud：Bps
Data：data bit
Parity：check bit
Stop：stop bit

6.2.42 C2_uartpacklen

Function：
Serial2 frame length setting
Form：
At+ C2_uartpacklen =<uartpacklen>\r
Parameter：

uartpacklen：Frame length of serial port group（Units：bytes）。

6.2.43 C2_uartpacktimeout

Function：
Serial port 2 serial frame time setting
Form：
At+ C2_uartpacktimeout=<uartpacktimeout>\r
Parameter：

uartpacktimeout：Group frame time of serial（Units：ms）

6.2.44 C2_tcp_auto

Function：
The serial 2TCP auto reconnect. This function is open and any connection is
disconnected for any reason. The module will continue to try to re-establish the
connection
Form：

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At+ C2_tcp_auto=<tcp_auto>\r
Parameter：

tcp_auto：0 - close，1 - enable

6.2.45 C2_tcp_client_check

Function：
Serial 2TCP CLIENT remote status detection.
Form：
At+ C2_tcp_client_check =< tcp_client_check >\r
Parameter：

tcp_client_check

value meaning

0 Close
1 Open

6.3 AT command control code routine

6.3.1 Configuration information query

code：

char *query="\
\
at+netmode=?\r\n\
at+wifi_conf=?\r\n\
at+dhcpd=?\r\n\
at+dhcpd_ip=?\r\n\
at+dhcpd_dns=?\r\n\
at+dhcpd_time=?\r\n\
at+dhcpc=?\r\n\
at+net_ip=?\r\n\
at+net_dns=?\r\n\
at+net_wanip=?\r\n\
\
at+remoteip=?\r\n\
at+remoteport=?\r\n\
at+remotepro=?\r\n\
at+timeout=?\r\n\
at+mode=?\r\n\
at+uart=?\r\n\

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at+uartpacklen=?\r\n\
at+uartpacktimeout=?\r\n\
at+ver=?\r\n\
";

Com_send(query);

Return：

at+netmode=? 0
at+wifi_conf=? Hi-Link,wpa2_aes,12345678
at+dhcpd=? 0
at+dhcpd_ip=? 192.168.14.1,192.168.15.254,255.255.254.0,192.168.15.254
at+dhcpd_dns=? 192.168.15.254,0.0.0.0
at+dhcpd_time=? 86400
at+dhcpc=? 1
at+net_ip=? 192.168.15.254,255.255.254.0,192.168.11.1
at+net_dns=? 192.168.11.1,0. 0.0.0
at+net_wanip=? ,,
at+remoteip=? 192.168.11.245
at+remoteport=? 8080
at+remotepro=? tcp
at+timeout=? 0
at+mode=? server
at+uart=? 115200,8,n,1
at+uartpacklen=? 64
at+uartpacktimeout=? 10
at+ver=? V1.39(Dec 6 2012)

6.3.2 Serial to Ethernet (dynamic ip address)

code：

char *commands_eth="\
\
at+netmode=1\r\n\
at+dhcpc=1\r\n\
\
at+remoteip=192.168.11.245\r\n\
at+remoteport=8080\r\n\
at+remotepro=tcp\r\n\
at+timeout=0\r\n\
at+mode=server\r\n\
at+uart=115200,8,n,1\r\n\
at+uartpacklen=64\r\n\
at+uartpacktimeout=10\r\n\

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at+net_commit=1\r\n\
at+reconn=1\r\n\
";

Com_send(commands_eth);

Reurn：

at+netmode=1 ok
at+dhcpc=1
at+remoteip=192.168.11.245 ok
at+remoteport=8080 ok
at+remotepro=tcp
at+timeout=0 ok
at+mode=server
at+uart=115200,8,n,1 ok
at+uartpacklen=64 ok
at+uartpacktimeout=10 ok
at+net_commit=1

6.3.3 Serial to Ethernet (static ip address)

code：

char *commands_eth_static="\
\
at+netmode=1\r\n\
at+dhcpc=0\r\n\
at+net_ip=192.168.11.254,255.255.255.0,192.168.11.1\r\n\
at+net_dns=192.168.11.1,8.8.8.8\r\n\
\
at+remoteip=192.168.11.245\r\n\
at+remoteport=8080\r\n\
at+remotepro=tcp\r\n\
at+timeout=0\r\n\
at+mode=server\r\n\
at+uart=115200,8,n,1\r\n\
at+uartpacklen=64\r\n\
at+uartpacktimeout=10\r\n\
at+net_commit=1\r\n\
at+reconn=1\r\n\
";

Com_send(commands_eth_static);

Return：

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at+netmode=1 ok
at+dhcpc=0
at+net_ip=192.168.11.254,255.255.255.0,192.168.11.1 ok
at+net_dns=192.168.11.1,8.8.8.8 ok
at+remoteip=192.168.11.245 ok
at+remoteport=8080 ok
at+remotepro=tcp
at+timeout=0 ok
at+mode=server
at+uart=115200,8,n,1 ok
at+uartpacklen=64 ok
at+uartpacktimeout=10 ok
at+net_commit=1

6.3.4 Serial to wifi client(dynamic ip address)

code：

char *commands_wifi_client="\
\
at+netmode=2\r\n\
at+wifi_conf=HI-LINK,wpa2_aes,12345678\r\n\
at+dhcpc=1\r\n\
\
at+remoteip=192.168.11.245\r\n\
at+remoteport=8080\r\n\
at+remotepro=tcp\r\n\
at+timeout=0\r\n\
at+mode=server\r\n\
at+uart=115200,8,n,1\r\n\
at+uartpacklen=64\r\n\
at+uartpacktimeout=10\r\n\
at+net_commit=1\r\n\
at+reconn=1\r\n\
";

Com_send(commands_wifi_client);

Return：

at+netmode=2 ok
at+wifi_conf=HI-LINK,wpa2_aes,12345678 ok
at+dhcpc=1
at+remoteip=192.168.11.245 ok
at+remoteport=8080 ok
at+remotepro=tcp

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at+timeout=0 ok
at+mode=server
at+uart=115200,8,n,1 ok
at+uartpacklen=64 ok
at+uartpacktimeout=10 ok
at+net_commit=1

6.3.5 Serial to wifi client(static ip address)

code：

char *commands_wifi_client_static="\
\
at+netmode=2\r\n\
at+wifi_conf=HI-LINK,wpa2_aes,12345678\r\n\
at+dhcpc=0\r\n\
at+net_ip=192.168.11.254,255.255.255.0,192.168.11.1\r\n\
at+net_dns=192.168.11.1,8.8.8.8\r\n\
\
at+remoteip=192.168.11.245\r\n\
at+remoteport=8080\r\n\
at+remotepro=tcp\r\n\
at+timeout=0\r\n\
at+mode=server\r\n\
at+uart=115200,8,n,1\r\n\
at+uartpacklen=64\r\n\
at+uartpacktimeout=10\r\n\
at+net_commit=1\r\n\
at+reconn=1\r\n\
";

Com_send(commands_wifi_client_static);

return：

at+netmode=2 ok
at+wifi_conf=HI-LINK,wpa2_aes,12345678 ok
at+dhcpc=0
at+net_ip=192.168.11.254,255.255.255.0,192.168.11.1 ok
at+net_dns=192.168.11.1,8.8.8.8 ok
at+remoteip=192.168.11.245 ok
at+remoteport=8080 ok
at+remotepro=tcp
at+timeout=0 ok
at+mode=server
at+uart=115200,8,n,1 ok

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at+uartpacklen=64 ok
at+uartpacktimeout=10 ok
at+net_commit=1

6.3.6 Serial to wifi AP

code：

char *commands_wifi_ap="\
\
at+netmode=3\r\n\
at+wifi_conf=Hi-Link_,wpa2_aes,0000000000\r\n\
at+dhcpd=1\r\n\
at+dhcpd_ip=192.168.16.100,192.168.16.200,255.255.255.0,192.168.16.254\r
\n\
at+dhcpd_dns=192.168.16.254,8.8.8.8\r\n\
at+dhcpd_time=86400\r\n\
at+net_ip=192.168.16.254,255.255.255.0,192.168.16.254\r\n\
at+net_dns=192.168.16.254,8.8.8.8\r\n\
\
at+remoteip=192.168.11.245\r\n\
at+remoteport=8080\r\n\
at+remotepro=tcp\r\n\
at+timeout=0\r\n\
at+mode=server\r\n\
at+uart=115200,8,n,1\r\n\
at+uartpacklen=64\r\n\
at+uartpacktimeout=10\r\n\
at+net_commit=1\r\n\
at+reconn=1\r\n\
";

Com_send(commands_wifi_ap);

return：

at+netmode=3 ok
at+wifi_conf=Hi-Link_,wpa2_aes,0000000000 ok
at+dhcpd=1 ok
at+dhcpd_ip=192.168.16.100,192.168.16.200,255.255.255.0,192.16 8.16.254 ok
at+dhcpd_dns=192.168.16.254,8.8.8.8 ok
at+dhcpd_time=86400 ok
at+net_ip=192.168.16.254,255.255.255.0,1 92.168.16.254 ok
at+net_dns=192.168.16.254,8.8.8.8 ok
at+remoteip=192.168.11.245 ok
at+remoteport=8080 ok

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at+remotepro=tcp
at+timeout=0 ok
at+mode=server
at+uart=115200,8,n,1 ok
at+uartpacklen=64 ok
at+uartpacktimeout=10 ok
at+net_commit=1

6.3.7 Factory reset

code：

char *commands_device_default="\
\
at+default=1\r\n\
at+reboot=1\r\n\
";

Com_send(commands_device_default);

return：

at+default=1

After 30s, the module starts normally and all configuration parameters are factory
configurations,

7 Serial configuration tool

HLK-7628N_CONFIG is a tool for configuring modules through serial ports. The tool

interface is as follows:

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1 2

13

3

14

12

5

4

6

7

8

9

10

11

Interface description：

1. Configure serial selection

2. Search module button

3. Work mode select button

4. Wireless configuration parameter

5. Network protocol selection

6. Serial configuration parameter

7. Network IP address configuration

8. Submit configuration button

9. Query configuration button

10. Enter transparent transmission button

Picture15. Serial configuration tool

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11. Restore factory setting button

12. AT command sending

13. AT command information return

7.1 Search module

By configuring the serial port selection, selecting the PC end string slogan,
and clicking the search module button, the tool will search the HLK-7628N module with
the specified serial port, and modules that have been connected and executed in the
AT instruction mode will be searched.The searched module information will be
displayed in the AT instruction execution return information area, as shown below:

Picture16. Serial configuration tool search module

At this point, PC and modules have been able to establish normal AT instruction
communication. All the AT command interaction processes need to be done on the basis
of normal AT instruction communication

7.2 Set preferences

The configuration item 3,4,5,6,7 configures the required function. During
configuration modification, the corresponding AT instruction is generated
immediately after the AT instruction area to be sent. The resulting AT instruction
is not passed to the module immediately. As follows:

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Picture 17. serial configuration tool instructions

7.3 Submit configuration

By clicking the submit configuration button, the tool immediately sends the
instruction of the AT instruction area to be sent to the module. The execution of
the command is displayed in the AT instruction execution return information area.

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Picture 18. Serial configuration tool

7.4 User data retention

The user parameter save area provides the ability to save parameters. By this
function, you can save up to 4 groups of parameters, user0, user1, user2, user3.,
and click the S button next to them, which pops up the confirmation box, as shown
below：

Picture19. Serial configuration tool to save

clicked"yes" button , the instruction of the AT instruction area to be sent will
be saved as the user0 parameter group. After any click on the user0, the user0
parameter group will be called immediately and the AT command area to be sent will
be covered

The saved user parameters are stored as text files in the tools directory. The
filenames are user0, user1, user2, user3.

7.5 Inquiry configuration

Click the query button configuration tool, immediately to send a series of commands
AT configuration module query module current, AT instruction execution results
immediately executed in the AT command returns the information display area, each
configuration item will return along with the corresponding change information.

7.6 Enter transparent transmission

Assuming that the module is already under the AT command, you can enter the
transmission mode immediately by clicking on the transmission mode button。

7.7 Factory reset

click the factory settings button,as shown below：

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Picture 20. erial configuration tool to restore factory settings

Clicked "yes" button , the tool sends the AT command immediately. After about
30s, the module enters the status of the factory settings

8 Searching device tool

HLK-7628N_Discover is a tool for searching HLK-7628N modules on the web side.The
interface is as follows：

Picture 21. Device search tool interface

Click “Discover” button, The tool will immediately search all the HLK-7628N
module in the LAN connected by PC.The search module is displayed immediately in the
message, The information contains ip address 、mac address and version information.

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9 Factory reset

Support the factory setting as following ways.

1.Through the web page.

2.Through the serial AT command.

3.By keeping WDT/RST pin low, the time is greater than Trst.

WDT/RST

>Trst

Reset to Default.

Picture 22. WDT/RST Factory reset

Factory default settings parameter as below:

netmode 0

wifi_conf Hi-Link_,wpa2_aes,12345678

Channel 1

dhcpc 1

net_ip 192.168.11.254,255.255.255.0,192.168.11.1

net_dns 192.168.11.1,8.8.8.8

dhcpd 1

t

dhcpd_ip 192.168.16.100,192.168.16.200,255.255.255.0,192.168.16.1

dhcpd_dns 192.168.16.1,8.8.8.8

dhcpd_time 86400

remoteip 192.168.11.245

remoteport 8080

remotepro tcp

timeout 0

mode server
uart 115200,8,n,1

uartpacklen 64

uartpacktimeout 10

escape 0

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escape2 1

tcp_auto 1

IP address 192.168.16.254

Wifi password 12345678

Web username/password admin/admin

Tes 100ms

Trst 6s

Tescape2 2000ms

C2_uart 57600,8,n,1
C2_mode 0

C2_remoteip 192.168.1.245

C2_port 8081

C2_CLport 0

C2_protocol 1

C2_timeout 0

C2_uartpacklen 64

C2_uartpacktimeout 10

C2_tcp_auto 1

C2_tcp_client_check 1

10 Upgrade firmware

1. Restore factory setting

2. Pc connect module with Ethernet mode, ip:192.168.16.123/255.255.255.0. Browser access

192.168.16.254. User name/password：admin/admin。

3. Open the following page. Select the appropriate firmware, click apply to start the

upgrade.Wait about 1.5 minutes, can not cut off power during the upgrade,

otherwise,module damage may occur.

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Picture 23. upgrade firmware

Attached：Please refer to other technical parameter：HLK-7628N-DATAsheet

FCC Warning

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.

NOTE 1: Any changes or modifications to this unit not expressly approved by the party responsible
for compliance could void the user's authority to operate the equipment.

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FCC Radiation Exposure Statement:

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. End users must follow the specific operating instructions for satisfying RF exposure
compliance.

Note 1: This module certified that complies with RF exposure requirement under mobile or fixed condition, this
module is to be installed only in mobile or fixed applications.

A mobile device is defined as a transmitting device designed to be used in other than fixed locations
and to generally be used in such a way that a separation distance of at least 20 centimeters is
normally maintained between the transmitter's radiating structure(s) and the body of the user or
nearby persons. Transmitting devices designed to be used by consumers or workers that can be
easily re-located, such as wireless devices associated with a personal computer, are considered to be
mobile devices if they meet the 20 centimeter separation requirement.

A fixed device is defined as a device is physically secured at one location and is not able to be
easily moved to another location.

Note 2: Any modifications made to the module will void the Grant of Certification, this module is
limited to OEM installation only and must not be sold to end-users, end-user has no manual
instructions to remove or install the device, only software or operating procedure shall be placed in
the end-user operating manual of final products.

Note 3: Additional testing and certification may be necessary when multiple modules are used.

Note 4: The module may be operated only with the antenna with which it is authorized. Any

antenna that is of the same type and of equal or less directional gain as an antenna that is authorized
with the intentional radiator may be marketed with, and used with, that intentional radiator.

Note 5: To ensure compliance with all non-transmitter functions the host manufacturer is
responsible for ensuring compliance with the module(s) installed and fully operational. For example,
if a host was previously authorized as an unintentional radiator under the Declaration of Conformity
procedure without a transmitter certified module and a module is added, the host manufacturer is

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深圳市海凌科电子有限公司 Shenzhen Hi-Link Electronic Co.,Ltd

Http://www.hlktech.com Tel:[phone] Fax:[phone]

responsible for ensuring that the after the module is installed and operational the host continues to
be compliant with the Part 15B unintentional radiator requirements. Since this may depend on the
details of how the module is integrated with the host, LM Technologies Ltd. shall provide guidance
to the host manufacturer for compliance with the Part 15B requirements.

Note 6: FCC ID label on the final system must be labeled with “Contains FCC ID:

2AD56HLK-7628N” or “Contains transmitter module FCC ID: 2AD56HLK-7628N”.

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