Ebyte E103-W02DTU User manual

1
Industrial WiFi Serial Server
E103-W02DTU
User Manual

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Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
2
Content
DISCLAIMER................................................................................................................................................................................................................................3
1. OVERVIEW............................................................................................................................................................................................................................... 4
1.1 INTRODUCTION ........................................................................................................................................................................................4
1.2 FEATURES ................................................................................................................................................................................................. 4
1.3 BASIC USAGE ...........................................................................................................................................................................................5
1.4 PRODUCT PARAMETERS .........................................................................................................................................................................5
2. BRIEF DESCRIPTION OF FUNCTIONS ........................................................................................................................................................................7
2.1 PIN DEFINITION ....................................................................................................................................................................................... 7
2.2 CONNECTION METHOD ..........................................................................................................................................................................9
3. QUICK START.......................................................................................................................................................................................................................10
3.1 WIFI SERIAL SERVER AS AP ESTABLISH SERVER AND PC WIRELESS CONNECTION .............................................................. 11
3.2 WIFI SERIAL SERVER AS STA (STATION) TO CONNECT TO OTHER WIFI HOTSPOTS................................................................ 19
3.3 REMOTE AT COMMAND ...............................................................................................................................................................................................26
3.4 MODIFY SERIAL PORT BAUD RATE.......................................................................................................................................................................26
3.5 WEB PAGE CONFIGURATION INSTRUCTIONS .................................................................................................................................................27
4. NETWORKING INSTRUCTIONS .................................................................................................................................................................................. 27
4.1 NETWORKING ROLES ...................................................................................................................................................................................................27
4.2 NETWORKING MODEL .................................................................................................................................................................................................28
5. AT INSTRUCTION SET......................................................................................................................................................................................................29
6. RELATED MODELS ............................................................................................................................................................................................................35
7. PRECAUTIONS FOR USE ................................................................................................................................................................................................ 35
8. IMPORTANT STATEMENT.............................................................................................................................................................................................. 36

Chengdu Ebyte Electronic Technology Co.,Ltd. E103-W02DTU User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

Chengdu Ebyte Electronic Technology Co.,Ltd. E103-W02DTU User Manual
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1. Overview
1.1 Introduction
E103-W02-DTU is a transparent transmission serial port to WiFi server, which realizes two-way transparent transmission
of RS232/RS485 serial port and WiFi data. It enables serial devices to immediately have TCP/IP network interface
function, which greatly expands the communication distance of serial devices.
E103-W02-DTU is developed based on TI's CC3200 chip solution, and users can choose either RS232 or RS485 serial
port for communication. The serial server integrates the pass-through function, plug-and-play, supports serial AT
command set, users can achieve the function of network access through the serial port, which is widely used in industrial
automation, home security, instrumentation, intelligent home appliances, remote control, electric power and other fields.
E103-W02-DTU supports standard IEEE802.11b/g/n protocol and complete TCP/IP protocol stack, STA/AP working
mode, SmartConfig, serial port pass-through, power-on pass-through, etc. It is very convenient to realize network access
function after simple configuration, which minimizes developers' work and project development time.
1.2 Features
★Supporting standard RS232 interface;
★supporting standard RS485 interface;
★support webpage configuration, you can access WiFi serial server through webpage and read or configure WiFi serial
server parameters quickly;
★supporting power-on pass-through, automatically connecting to WiFi network on power-on, and then connecting to the
target device through the protocol;
★support disconnection auto reconnect, after the network connection is disconnected and restored, the WiFi serial
server will automatically reconnect to the target;
★support remote AT command, WiFi serial server can be configured remotely using AT command;
★support for OneNet, the IoT development platform;
★industrial-grade design, supporting long-time operation at -40℃～+85℃;
★Efficient watchdog, which will restart automatically in case of abnormality.

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1.3 Basic usage
No
Usage
Description
0
WiFi serial server
communicates with
WiFi serial server
WiFi serial server No. 1 is set to AP mode and establish TCP or UDP server, WiFi
serial server No. 2 is set to STATION mode and connect to AP No. 1, and
communicate with WiFi serial server No. 1 through TCP or UDP Client mode
1
WiFi serial server and
Server communication
WiFi serial server connects to the network through the wireless router and
communicates with the server on the network (LAN or Internet) via TCP Client or
UDP;
If you need to connect to an Internet server, you need to configure the router with the
appropriate port mapping.
2
WiFi serial server and
Client communication
WiFi Serial Server connects to the network through a wireless router and establishes a
TCP or UDP Server to listen for connection signals;
Client communicates with WiFi Serial Server Server by connecting to it.
For more information on how to use it, please refer to the network instructions in Section 5.
1.4 Product parameters
No
Parameter
Name
Parameter Value
Note
System Parameters
1
RF Chips
CC3200
TI
2
RAM
256KB
-
3
Flash
8Mbit
Winbond
WiFi parameters
4
WiFi Version
802.11 b/g/n
-
5
Operating
Frequency
Band
2.412～2.484 GHz
-
6
Modulation
method
OFDM/DSSS
-
7
Transmit
power
20dBm
pprox. 100mW
8
Measured
distance
约300m
Clear and open environment, maximum power, antenna gain
3dBi, height 2m
9
Operating
mode
AP/STA
Support AP working mode and STATION working mode
10
Encryption
method
WEP/WPA2
-
11
Configuratio
n method
AT/UDP/HTTP
Convenient configuration of the module via serial AT
commands, remote UDP AT commands, and HTTP web pages
Basic parameters
12
Production
process
Machine paste,
lead-free process
Wireless products must be machine labeled to ensure batch
consistency and reliability
13
Interface
Method
RS485：1*4*3.81mm
RS232：DB9
Crimping method
14
Antenna
Interface
SMA-K
Standard DB9, hole type

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15
Communicati
on interface
RS232/RS485
Male female thread, 50 ohm characteristic impedance
16
Serial port
baud rate
300～400000 bps
Both RS232 and RS485
17
Power
supply
voltage
8～28V DC
Support multiple data bits, check bits, stop bits (factory
default 115200, 8N1)
18
Operating
current
77mA
Power adapter or crimp terminal VCC/GND (either can be
selected)
19
Product Size
82*84*24mm
Note: Voltage higher than 28V will cause permanent damage
to the module
20
Average
weight
130g
The power supply is 12V
Temperature and humidity
21
Working
temperature
-40～+85℃
Industrial grade
22
Working
Humidity
10%～90%
Relative humidity, non-condensing
23
Storage
Temperature
-40～+85℃
Industrial grade

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2. Brief description of functions
2.1 Pin definition

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No
Name
Usage
1
RS232
Standard DB9, hole type
2
485_A
A terminal for external RS485 device
3
485_B
B terminal of external RS485 device
4
GND
Ground wire
5
VCC
Power supply, default power supply 8 to 28V (standard 5V version can be
customized)
(5 and 6 automatically select the high voltage end)
6
DC 8～28V
DC power supply interface (5.5*2.5), connected to DC8~28V power supply
(standard 5V version can be customized)
7
ANT
Antenna connector (SMA-K male female threaded hole, 50Ω characteristic
impedance)
8
PWR
Power indicator, power on indicator on, power off indicator off
9
LINK
Socket connection status indicator, LINK indicator on when connected
successfully, disconnect indicator off, LINK light blinks three times when
restoring factory
10
TX/RX
The indicator blinks when data is sent or received
11
(M0)
Program
Burning emulation mode selection, default set to high; when you need to
re-download the program, please set the dip switch to low
12
(M1) Restore
When you need to restore the factory settings, please set the dipswitch to low
first, then power on and wait for the STAT indicator to blink off three times, then
restore the factory settings. The module only detects this pin when it starts up,
and setting the pin low after starting up cannot perform restoration action.

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2.2 Connection method
RS232 connection method
RS485 connection method
Note: WiFi serial server can be powered by power adapter or crimp terminal VCC/GND (either one can be chosen).

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3. Quick Start
The E103-W02-DTU Serial Server is easy to use. In order to let users get familiar with it quickly, this section will guide
users to realize the configuration and communication in various modes after simple settings.
The test process uses all AT commands, and for users to make quick connections, we have developed web HTTP for
users to make quick configurations.
The tests in this section are conducted using the serial debugging assistant, and the WiFi serial server will display back
the current commands issued, so that users can quickly understand the usage of AT commands. (Note: All AT commands
need to be followed by a line break, except for the "++++" command, i.e., only the "++++" command does not need to be
followed by a line break)
In addition, users can use external microcontrollers (MCU) directly connected to the WiFi serial server UART for AT
instruction communication without using the backplane to achieve secondary development
The hardware that will be used in this section：
1
E103-W02DTU model WiFi serial server 1pc
2
1 computer with WiFi function
3
Router 1 (can be replaced by cell phone WiFi hotspot)
The software that will be used in this section (all can be downloaded from the official website)
1
Serial port debugging assistant AccessPort
2
TCP & UDP test tool
3
SmartConfig (one-click configuration) mobile app "Wi-Fi Starter"

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3.1 WiFi Serial Server as AP Establish SERVER and PC wireless connection
No
Remarks
1
[WiFi serial server as AP to establish connection with PC]:
①Connect the factory E103-W02-DTU base board to PC via Micro USB cable;
②Open the serial debugging assistant "AccessPort" and select the port number; if you are not
sure about the port number, please check in the device manager (see the figure
below).
③Set serial port debugging parameters (baud rate: 115200bps, data bit: 8bit, parity bit: no parity,
stop bit: 1bit) (see the figure below)

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④We open the wireless network on the PC, find the wireless network with SSID starting with
"EBT" (e.g. EBT_9BB311), and click "Next" to connect.
<The "9BB311" here is the last 6 bits of the WiFi serial server MAC address, different WiFi serial
servers have different MAC addresses, so different WiFi serial servers have different factory
SSIDs>.
⑤After successful connection, the WiFi connection status light on the WiFi serial server
backplane is on and the PC shows successful connection, otherwise, please operate the above steps
again.

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2
[WiFi serial server as AP to establish TCP SERVER to communicate with PC]:
①Open the TCP & UDP test tool, create the connection and set the parameters (see the figure
below).

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②Click the "Create" button to complete the creation, and then click the "Connect" button.
③WiFi serial server backplane LINK indicator is on, indicating the completion of the connection,
you can complete the bi-directional data transfer between PC and WiFi serial server (i.e. TCP &
UDP test tool and serial debugging assistant bi-directional communication), otherwise, please
operate the above steps again.

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④You can also transfer files (preferably in TXT format) Oh, try it quickly.
3
[WiFi serial server as AP to establish UDP SERVER to communicate with PC]:
①Above serial number 2 completes the TCP communication, next we will establish UDP
communication, which requires us to do simple configuration of WiFi serial server.
②Please complete serial number 1 before we enter AT command mode for simple

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configuration. <Please be sure to complete serial number 1 first>
<Since we are sending commands, please turn off the Real Time Send function of the serial
port for better debugging.
If the serial debugging assistant you are using does not have the Real Time Send function,
please ignore this article>.
a. Start serial debugging, enter the command "+++" in the send text box (please do not
add line break), click Send to start sending commands.
b. If the serial port returns "Entered AT mode" message, it indicates that it has entered AT
command mode, otherwise, please operate the above steps again.
③We have entered AT command mode by step ②, and we will start to configure the socket
protocol.
A. Enter the command "AT+SOCK=UDP,SERVER,192.168.1.2,8887,8889" in the Send text
box (please add a line break, i.e. after entering the command "AT+SOCK=UDP,SERVER,192.168.
1.2,8887,8889" command followed by the Enter key), click Send to start sending commands.
B. If the serial port returns the message "Socket update OK", it indicates that the command has
set the protocol parameters successfully, otherwise, please operate the above steps again.

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④Please reset or power down and reboot after setting parameters to take effect; if there are other
parameters not set, please reset or power down and reboot after setting other parameters. Because
we only configure the socket protocol here, so we reset or power down and restart directly, and
then the WiFi connection status indicator on the base board will be lit immediately, indicating that
the UDP protocol is enabled.
⑤Open the TCP & UDP test tool, create a connection, and set the parameters (see the figure
below).

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(6) Click the "Create" button to complete the creation.
(7) If the creation is successful, you can complete the bi-directional data transfer between PC and
WiFi serial server (i.e. TCP & UDP test tool and serial debugging assistant bi-directional
communication), otherwise, please operate the above steps again.

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⑧. You can also transfer files (preferably TXT format files) Oh , try it quickly.
3.2 WiFi Serial Server as STA (Station) to connect to other WiFi hotspots
No
Remarks
1
[WiFi Serial Server as STA (Station) to connect to other WiFi hotspots]
①Connect the factory E103-W02-DTU base board to PC via Micro USB cable;
②Open the serial debugging assistant "AccessPort" and select the port number; if you are not
sure about the port number, please check in the device manager (see the figure below).

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③Set the serial debug parameters (Baud rate: 115200bps, data bit: 8bit, parity bit: no parity, stop
bit: 1bit). (See the figure below)
④Next, we enter AT command mode for simple configuration.
<Since we are sending commands, please turn off the Real Time Send function of serial port
for better debugging.
If the serial debugging assistant you are using does not have the Real Time Send function,
please ignore this article>.
a. Start serial debugging, enter the command "+++" in the send text box (please do not add
line break), click Send to start sending commands.
b. If the serial port returns the message "Entered AT mode", it indicates that it has entered
AT command mode, otherwise reset and retry the above steps.
⑤Now our WiFi serial port server is used as STA mode to connect to other APs, so we need to
set the mode to STA mode first.
a. Enter the AT command "AT+ROLE=STA" in the Send text box of the serial debug
assistant (please add a line break, i.e. add the Enter key after entering the command
"AT+ROLE=STA") and click Send to send the command.
b. If the message "Set STA mode" is displayed on the serial port, it indicates that the STA mode
has been set successfully, otherwise, please operate the above steps again.
⑥Next, you need to set the parameters of the WiFi hotspot we want to connect to (STA