Ebyte E810-DTU User manual

Chengdu Ebyte Electronic Technology Co,.Ltd E810-DTU User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co,.Ltd
E810-DTU(RS232) V2.0

Chengdu Ebyte Electronic Technology Co,.Ltd E810-DTU User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co,.Ltd
1
Contents
1. INTRODUCTION.............................................................................................................................................................. 1
PRODUCT SPECIFICATIONS AND FEATURES..........................................................................................................1
2. INTRODUCTION OF HARDWARE PARAMETERS AND DESIGN.............................................................................. 3
2.1 INTERFACE INTRODUCTION.............................................................................................................................................3
2.2 DIMENSION.....................................................................................................................................................................5
2.3 CONNECTION METHOD................................................................................................................................................... 6
2.3.1 RS232 connection.................................................................................................................................................. 6
2.3.2 RS485 connection.................................................................................................................................................. 6
3 NETWORK BASIC FUNCTION INTRODUCTION..........................................................................................................7
3.1 IP ADDRESS/SUBNET MASK/GATEWAY........................................................................................................................... 7
3.2 DNS SERVER ADDRESS...................................................................................................................................................8
4 SOCKET CHARACTERISTICS........................................................................................................................................... 8
4.1. TCP SERVER CHARACTERISTICS.................................................................................................................................... 9
4.2. TCP CLIENT CHARACTERISTICS.................................................................................................................................. 10
4.3. UDP SERVER CHARACTERISTICS................................................................................................................................. 11
4.4. UDP CLIENT CHARACTERISTICS..................................................................................................................................11
5 SPECIAL FUNCTION................................................................................................................................................... 12
5.1 SHORT CONNECTION.....................................................................................................................................................12
5.2 REGISTRATION PACKET MECHANISM............................................................................................................................12
5.3 HEARTBEAT MECHANISM............................................................................................................................................. 14
5.4 OVERTIME RESTART......................................................................................................................................................14
5.5 TCP MULTI-CONNECTION FUNCTION............................................................................................................................ 14
5.6 CLEARING CACHED DATA.............................................................................................................................................15
5.7 LINK AND DATA TRANSFER INSTRUCTIONS...................................................................................................................15
5.8 WEB PAGE CONFIGURATION......................................................................................................................................... 15
5.9 KEEP-ALIVE FUNCTION................................................................................................................................................ 18
5.10 MODBUS TCP TO RTU FUNCTION..............................................................................................................................18
5.11 FACTORY RESET..........................................................................................................................................................19
5.12. INTERNET OF THINGS FEATURES................................................................................................................................19
5.12.1 Ali cloud.............................................................................................................................................................. 19
5.12.2 Baidu cloud.........................................................................................................................................................20
5.12.3 Ebyte cloud.........................................................................................................................................................20
5.12.4 ONENET..............................................................................................................................................................20
6 QUICK INSTRUCTIONS................................................................................................................................................. 21
6.1 PARAMETER SETTING INSTRUCTION............................................................................................................................. 21
6.2 SOCKET INSTRUCTIONS................................................................................................................................................ 21
6.2.1 TCP Server instructions........................................................................................................................................21
6.2.2 TCP Client instructions.........................................................................................................................................24
6.2.3 UDP Server instructions.......................................................................................................................................27

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6.2.4 UDP Client instructions........................................................................................................................................30
6.3 SPECIAL FUNCTION INSTRUCTIONS............................................................................................................................... 32
6.3.1 Short connection instructions.............................................................................................................................32
6.3.2 Registration packet instructions......................................................................................................................... 33
6.3.3 Heartbeat packet instructions.............................................................................................................................35
6.3.4 Overtime restart instructions.............................................................................................................................. 35
6.3.5 Clearing cache instructions................................................................................................................................. 36
7 AT COMMAND............................................................................................................................................................... 37
7.1 AT COMMAND SUMMARY............................................................................................................................................. 37
7.2 AT COMMAND ERROR CODE......................................................................................................................................... 38
7.3 AT COMMAND SET........................................................................................................................................................38
7.4 AT COMMAND DETAILED INSTRUCTIONS...................................................................................................................... 39
8 ABOUT US....................................................................................................................................................................... 52

Chengdu Ebyte Electronic Technology Co,.Ltd E810-DTU User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co,.Ltd
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1. Introduction
E810-DTU(RS232)-V2.0 is a RS232 to Ethernet single serial port server. Realize
data transparent transmission between RJ45 network port and RS485/RS232..
The module is equipped with a M0+ series of 32-bit processors, fast and efficient.
It has an adaptive network speed (up to 100M full duplex), and has four
communication mechanisms: TCP Server, TCP Client, UDP Server, and UDP Client.
The E810-DTU(RS232)-V2.0 is easy to operate. The user can directly configure
the parameters of the module through the host computer to easily implement data
transmission.
Product specifications and features
No.
Specification
Description
1
Size
66 * 66 *21.6mm
2
Weight
79±1g
3
PCB process
2 layer，SMT, lead-free
4
Connector
RS485/RS232：1*5*3.81mm
5
Supply voltage
8~28V DC，Note：Higher than 28V will cause permanent damage
6
UART standard
1200~256000 bps
7
Serial communication
level
3.3V，If connected to 5V, level conversion is required
8
Ethernet specification
RJ45，10/100Mbps
9
Network protocol
IP、TCP/UDP、ARP、ICMP、IPV4
10
IP Acquisition
Static IP、DHCP
11
DNS
Available
12
User configuration
PC software , AT command configuration、Web page configuration
13
Simple transparent
transmission
TCP Server 、TCP Client 、UDP Server 、UDP Client
14
TCP Server connection
Max. 6 channel of TCP connections
15
Software
RF Setting

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Package mode
200 bytes per package
17
Operating current
77.0314mA@12V(RS485) ，74.5635mA@12V(RS232)
18
Operating temperature
-40 ~ +85℃
19
Operating humidity
10% ~ 90%，relative humidity, no condensation
20
Storage temperature
-40 ~ +125℃

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1. Introduction of hardware parameters and design
2.1 Interface introduction
No.
Item
Description
1
VCC
DC power supply, it is recommended to use standard 12V or 24V
2
GND
Ground
3
GNDA
RS232 end for connecting GND of other RS232 device
4
B/TXD
External A / RS232 input of other RS485 devices, or TXD of other RS232 devices
5
A/RXD
External B / RS232 output of other RS485 devices, or RXD of other RS232 devices
6
PWR
Power indicator
7
WORK
UART TX and RX indicator
8
LINK
Indicator for building link remotely
9
INTERNET
RJ45 with network transformer

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10
RESET
Reset to factory default
11
DC 8-28V
DC power supply, it is recommended to use standard 12V or 24V

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2.2 Dimension

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2.3 Connection method
2.3.1 RS232 connection
2.3.2 RS485 connection
In RS485 communication, it should be noted that A and B are matched first. If it is abnormal, 120R resistors should
be added between A and B lines.

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3 Network basic function introduction
3.1 IP address/Subnet mask/Gateway
1. The IP address is the identity of the module in the LAN. It is unique in the LAN and cannot be duplicated with
other devices on the LAN.
E810-DTU(RS232)-V2.0’s IP address of E810-DTU is static IP and DHCP.
(1) Static IP
Static IP requires the user to set manually， please note that the IP, subnet mask, and gateway should be written at the
same time. Static IP is suitable for scenarios that require IP and device statistics and have a one-to-one correspondence.
Advantage: Devices which cannot automatically assign IP addresses can be searched through the entire LAN.
Disadvantages: Different IP segments in different LANs cannot carry out normal TCP/UDP communication.
(2) DHCP
The main role of DHCP is to dynamically obtain IP address, Gateway address, DNS server address and other
information from the gateway host, eliminating the cumbersome steps of setting the IP address. It is suitable for scenarios
where there is no requirement for IP and no need for correspondence one by one of IP and modules.
Advantages: When connected routers and other devices with DHCP Server can communicate directly, and reduce
the hassles of setting up IP address gateways and subnet masks.
Disadvantages: When connected LANs without DHCP Server，such as computers, E810-DTU(RS232)-V2.0 cannot
work.
2. The subnet mask is mainly used to determine the LAN number and host number of the IP address, and indicate
the number of subnets, and judge whether the module is within the subnet。The subnet mask have to be set, what we
normally use is C type subnet mask: 255.255.255.0, LAN number is the first 24 numbers, host number is the last 8
numbers, and there are 255 subnets, If the module IP is within the 255 subnets, it is considered to be in this subnet.
3. The gateway refers to the LAN number of the LAN where the current IP address of the module is located. If a
device such as a router is connected to an external network, the gateway is the router IP address， If the setting is incorrect,
the external network cannot be accessed properly，If you do not connect a device such as a router, you do not need to set
it, by default.

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4. Software setting
Figure 1 Parameter setting software
3.2 DNS server address
The DNS server is mainly used to convert the domain name into a network-recognizable IP address. DNS server
address can be set, it can implement domain name resolution when the local domain name server is not complete. Users
can also set specific DNS server addresses as required, E810-DTU(RS232)-V2.0 will submit a resolution request to the
configured DNS server when domain name resolution is required, more flexible and reliable.
In static IP mode, the default address of the DNS master server is 61.139.2.69, and the backup DNS server address
is 192.168.4.1. In DHCP mode, the DNS server address is automatically obtained. Domain name server address
supported by the module can be set.
4 Socket characteristics
The Socket operating mode of E810-TTL is divided into TCP Client, TCP Server, UDP Client, and UDP Server., it
can be set with the host computer software, the setting interface is as follows:

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Figure 2 Setting interface
4.1. TCP Server characteristics
Figure 3 TCP Server
(1) In TCP Server mode, E810-DTU(RS232)-V2.0 monitors the local port, receiving and establishing a connection

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for data communication when a connection request is sent. When the E810-DTU(RS232)-V2.0 serial port receives data,
it will transmit data to all client devices which established a connection with the E810-DTU(RS232)-V2.0.
(2) It is usually used for communication with TCP clients in the LAN. Suitable for scenarios where there is no
server in the LAN and there are many computers or cellphones requesting data from the server. There is difference
between connection and disconnection like TCP Client to ensure the reliable exchange of data.
(3) When the E810-DTU(RS232)-V2.0 is a TCP Server, it can connect at most six clients, the local port number is
a fixed value and cannot be set to 0.
4.2. TCP Client characteristics
Figure 4 TCP Client
(1) TCP Client provides Client connectivity for TCP network services. Proactively initiates connection requests to
the server and establishes connections for the interaction of serial data and server data. According to the relevant TCP
protocol, there is difference between connection and disconnection to ensure the reliable exchange of data. It is normally
used for data exchange between devices and servers and it is the most commonly used networking communication
method.
(2) In TCP Client mode, when the E810-DTU(RS232)-V2.0 attempts to connect to the server and the local port is 0,
it initiates a connection with a random port each time.
(3) This mode supports short connection function。
(4) In the same LAN, if the E810-DTU(RS232)-V2.0 is set to static IP, please keep the E810-DTU(RS232)-V2.0 IP
and gateway in the same network segment and set the gateway IP correctly, otherwise it cannot communicate normally.

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4.3. UDP Server characteristics
Figure 5 UDP Server
(1) UDP Server means that the source IP address is not verified on the basis of normal UDP. After each UDP packet
is received, the target IP is changed to the data source IP and port number, when the data is transmitted, it will be sent to
the IP and port number which was the nearest communication one.
(2) This mode is normally used for multiple network devices which need to communicate with the module, and do
not want to use TCP's data transmission due to fast speed and frequency.
4.4. UDP Client characteristics
Figure 6 UDP Client
(1) UDP Client is a connectionless transmission protocol that provides a simple, unreliable information transfer
service, without connection establishment and disconnection, only IP and port are needed to send data. Generally used
for data transmission scenarios where packet loss rate is not required, data packets are small and the frequency is fast,

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and data is transmitted to a specified IP.
(2) In UDP Client mode, the E810-DTU(RS232)-V2.0 will only communicate with the target IP's target port, if the
data is not from this channel, it will not be received by the E810-DTU(RS232)-V2.0.
(3) In UDP Client mode, if the target address is set to 255.255.255.255, it will broadcast within the whole UDP
network segment, and it can also receive broadcast data ，E810-DTU(RS485)-V2.0 supports broadcast within the
supporting network segment, such as the mode of xxx.xxx.xxx.255.
5 Special function
5.1 Short connection
The use of short connections is mainly to save server resources, and is generally applied to multipoint-to-point
scenarios. Short connections is to ensure that existing connections are useful connections and do not require additional
controls for filtering.
The short connection function is applied in the TCP Client mode. After the short connection function is enabled,
when sending data. If no data is received from the serial port or network port within the setting time, the connection will
be automatically disconnected. The short connection function is turned off by default, and the disconnection time can be
set after the function is turned on, the range is 2~255S.
5.2 Registration packet mechanism
In the network transparent transmission mode, users can make the module send registration packets to the server.
The registration packet is for the server to identify the data source device, or as a password to obtain server authorization.
E810-DTU(RS232)-V2.0 has 4 registration packet mechanisms:
Sending MAC when connecting: The module will send the its own MAC address to the device when the connection
is established.
Sending user-defined data when connecting: The module sends a user-defined data to the device when the
connection is established
Each packet of data sending MAC: The module will add its MAC address in front of each frame of data sent.
Each packet of data sending user-defined data: The module will add its user-defined data in front of each frame of

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data sent.
Figure 7 Sending MAC when connecting
Figure 8 Sending user-defined data when connecting
Figure 9 Each packet of data sending MAC
Figure 10 Each packet of data sending user-defined data
Sending a registration packet when establishing a connection are mainly used to connect to a server that requires
registration. Data-carrying registration packets refers to accessing registration packets at the head of data in sending data,
which is mainly used for protocol transmission. The user-defined data packet defaults to hexadecimal data (ASCII code
optional) and the maximum packet length is 40 bytes.

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5.3 Heartbeat mechanism
In the network transparent transmission mode, users can make the module send heartbeat packets to the server.
Heartbeat packets can be sent to the web server or sent to the serial device, they cannot run at the same time.
Network heartbeat pocket: The heartbeat packet is sent to the network, in the heartbeat transmission cycle, the
module sends heartbeat packet data to the network server to maintain the connection with the network server. It only runs
in the TCP Client and UDP Client modes。
Serial data packet: In the set heartbeat sending cycle, the module sends heartbeat packet data to the serial port, users
can do corresponding processing after the serial port receives the heartbeat data.
In an application in which a server sends a fixed inquiry command to a device, in order to reduce communication
traffic, users can choose to send a heartbeat packet (inquiry command) to the serial device side instead of sending a
inquiry command from the server.
User-defined data packet defaults to hexadecimal data (ASCII code optional), E810-DTU(RS232)-V2.0 module
supports custom heartbeat packet content up to 40 bytes.
5.4 Overtime restart
Overtime restart (no data restart) function is mainly used to ensure long-term stability of E810-DTU(RS232)-V2.0.
When the network port cannot receive data for a long time, or if the network does not receive data for a long time, the
E810-DTU(RS232)-V2.0 will restart after exceeding the set time, thus avoiding the influence of abnormal conditions on
the communication. The normal working time of this function is set to 60~65535S, default 300S. When the setting time
is less than 60S, the default setting is zero, that is, the function is turned off.
5.5 TCP multi-connection function
TCP multi-connection function is mainly to solve that in the TCP Sever mode, the user has multiple clients to
connect E810-DTU(RS232)-V2.0 and send and receive data at the same time. When E810-DTU(RS232)-V2.0 is used as
a TCP Server, up to 6 connections can be established at the same time, the TCP Server sends data to multiple (up to 6)
TCP clients on the connection at the same time. When the number of established connections exceeds six, the connection
established at the beginning will be actively disconnected, that is, the old connection will be kicked off.

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5.6 Clearing cached data
When the TCP Client connection is not established, the data received by the serial port will be placed in the buffer
area, the E810-DTU(RS232)-V2.0 serial port receive buffer is 400 bytes. When the connection is established, the serial
port buffer data can be set whether to clear according to customer needs.
5.7 Link and data transfer instructions
Link indicates the network connection status of the module. In TCP mode, when the network is not connected, the
link goes out. When the connection is established, the link is always on. Link indicator is on in UDP mode.
The other is the data transmission indication, which shows the data transmission status of the serial port of the
module. When there is no data transmission on the serial port, the data transmission indicator is extinguished. When there
is data transmission on the serial port, the flashing indicates that the period is 60ms and the indicator lit 10ms.
5.8 Web page configuration
Users can enter the IP address and port of the module through any browser (the default port of the browser is 80)
and enter the web page after successful login. As shown in the picture:

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Select one or more pages according to specific requirements for parameter browsing and configuration (take serial
port parameters as an example).

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After filling in the parameters correctly, click save Settings
The page will automatically jump to the module management page. After clicking the restart module, the module