Ebyte E810 Series User manual

Chengdu Ebyte Electronic Technology Co., Ltd. E810-DTU(4RS1E) User Manuel
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co., Ltd. 1
CONTENTS
1. PRODUCT INTRODUCTION.......................................................................................................................................................2
1.1. INTRODUCTION.............................................................................................................................................................................2
1.2. FEATURE...................................................................................................................................................................................... 2
1.3. SPECIFICATION.............................................................................................................................................................................2
2. PRODUCT DESIGN.......................................................................................................................................................................4
2.1. IDENTIFICATION（SIZE）............................................................................................................................................................ 4
2.2. IDENTIFICATION（INTERFACE AND INDICATOR）....................................................................................................................... 4
2.3. CONNECTION METHOD................................................................................................................................................................. 7
3. INTRODUCTION TO BASIC NETWORK FUNCTIONS......................................................................................................... 8
3.1 IP ADDRESS/SUBNET MASK/GATEWAY......................................................................................................................................... 8
3.2 DNS SERVER ADDRESS................................................................................................................................................................. 9
4. SOCKET FUNCTIONAL CHARACTERISTICS....................................................................................................................... 9
4.1. TCP SERVER MODE CHARACTERISTIC....................................................................................................................................... 10
4.2. TCP CLIENT MODE CHARACTERISTIC........................................................................................................................................10
4.3. UDP SERVER MODE CHARACTERISTIC.......................................................................................................................................11
4.4. UDP CLIENT MODE CHARACTERISTIC....................................................................................................................................... 11
5. SPECIAL FUNCTIONS............................................................................................................................................................... 12
5.1. SHORT CONNECTION.................................................................................................................................................................. 12
5.2. REGISTRATION PACKET MECHANISM......................................................................................................................................... 12
5.3. HEARTBEAT PACKET MECHANISM............................................................................................................................................. 12
5.4. TIMEOUT RESTART..................................................................................................................................................................... 13
5.5. TCP MULTI-CONNECTION FUNCTION......................................................................................................................................... 13
5.6. CLEAR CACHE DATA.................................................................................................................................................................. 13
5.7. LINK AND DATA TRANSMISSION COMMAND...............................................................................................................................13
5.8. KEEPALIVE FUNCTION............................................................................................................................................................... 13
5.9. MODBUS TCP TO TU FUNCTION................................................................................................................................................ 14
5.10. RESTORE FACTORY SETTING.....................................................................................................................................................14
6. QUICK INSTRUCTIONS............................................................................................................................................................ 14
6.1. PARAMETER SETTING INSTRUCTION........................................................................................................................................... 14
6.2. SOCKET INSTRUCTION................................................................................................................................................................14
6.3. SPECIAL FUNCTION INSTRUCTIONS.............................................................................................................................................21
7.IMPORTANT STATEMENT........................................................................................................................................................ 21
8.REVISION VERSION................................................................................................................................................................... 22
ABOUT US.........................................................................................................................................................................................22

Chengdu Ebyte Electronic Technology Co., Ltd. E810-DTU(4RS1E) User Manuel
Copyright ©2012–2017，Chengdu Ebyte Electronic Technology Co., Ltd. 2
1. Product introduction
1.1. Introduction
E810 (4RS1E) is a four serial port server of RS422 & RS485 & RS232 to Ethernet, which realizes transparent data
transmission between RJ45 network port and RS422, RS485, RS232. The device is equipped with M3 series 32-bit processor,
which runs fast and has high efficiency, with adaptive network rate. TCP Server, TCP Client, UDP Server, UDP Client four
communication mechanisms. E810 (4RS1E) is easy to operate, and users can configure the parameters of the device through the
web page to easily achieve data transmission.
1.2. Features
1. Four channels of 485/232/422 and RJ45 Ethernet data transparent transmission;
2. Modbus-RTU to Modbus-TCP available;
3. AT command is configurable;
4. Web page configuration available;
5. The hardware watchdog is with high reliability;
6. The power supply has good functions such as over-current, over-voltage, and anti-reverse connection;
7. Wide voltage input 8V-28V, 12V or 24V is recommended.
1.3. Specification
No.
Specification and
characteristic
Description
1
Supply voltage
8 ~ 28V DC, note: higher than 28V will cause permanent damage to the device, 12V or 24V power supply is
recommended
2
Working current
180.7mA@12V(RS232) ，176.8mA@12V(RS485) ，173.8mA@12V(RS422)
3
Operating mode
Asynchronous half-duplex or asynchronous full-duplex
4
Interface mode
RS232:Network port type connector,The line sequence is introduced as follows
RS485/RS422:1*5*3.81,Crimping method
RJ45:Network port
5
Transmission medium
Network cable / twisted pair or shielded wire
6
Serial port standard
RS232:1200~115200bps
RS485/RS422:1200~460800 bps
7
Network port
specification
RJ45，10/100Mbps
8
Network protocol
IP、TCP/UDP、ARP、ICMP、IPV4

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9
IP access method
Static IP、DHCP
10
DNS
Support
11
User configuration
Web page configuration
12
Simple transparent
transmission method
TCP Server 、TCP Client 、UDP Server 、UDP Client
13
TCP Server connection
Supports up to 4 TCP connections
14
Operating temperature
-40 ~ +85℃，Industrial grade
15
Operating humidity
10% ~ 90%，Relative humidity, non-condensing
16
Storage temperature
-40 ~ +125℃，Industrial grade
17
Average weight
416g
18
Size
150*107*29

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2. Product design
2.1. Identification（Size）
2.2. Identification（Interface and indicator）

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Pin No.
Name
Usage
1
Ethernet
RJ45 network interface
2
Reload
Factory reset button, long press for 5 ~ 10s is effective
3
1R-
The first serial port RS422 data receiving (B-) interface (3.81mm connecting terminal)
4
1R+
The first serial port RS422 data receiving (A +) （3.81mm connecting terminal）
5
GND1
Ground reference for the first and second signal (3.81mm connecting terminal)
6
1T-(1-485-B)
The first serial port RS485 data interface terminal B/ RS422 data transmission (B-) interface (3.81mm
connecting terminal)
7
1T+(1-485-A)
The first serial port RS485 data interface terminal A/ RS422 data transmission (A +) interface (3.81mm
connecting terminal)
8
2R-
The second serial port RS422 data receiving (B-) interface (3.81mm connecting terminal)
9
2R+
The second serial port RS422 data receiving (A +) (3.81mm connecting terminal)
10
GND1
Reference ground for the 1st and 2nd signal（3.81mm connecting terminal）
11
2T-(2-485-B)
The second serial port RS485 data interface terminal B/ RS422 data transmission (B-) interface (3.81mm
connecting terminal)
12
2T+(2-485-A)
The second serial port RS485 data interface terminal A/ RS422 data transmission (A +) interface (3.81mm
connecting terminal)
13
2-RS232
The second RS232 data interface (network port type connector)

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14
1-RS232
The first RS232 data interface (network port type connector)
15
PE
Ground screw post connected to the earth
16
3-RS232
The third RS232 data interface (network port type connector)
17
4-RS232
The fourth RS232 data interface (network port type connector)
18
4T+(4-485-A)
The fourth serial port RS485 data interface terminal A/ RS422 data transmission (A +) interface (3.81mm
connecting terminal
19
4T-(4-485-B)
The fourth serial port RS485 data interface terminal B/ RS422 data transmission (B-) interface (3.81mm
connecting terminal)
20
GND2
The third and fourth signal reference ground (3.81mm connecting terminal)
21
4R+
The fourth serial port RS422 data receiving (A +) (3.81mm connecting terminal)
22
4R-
The fourth serial port RS422 data receiving (B-) interface (3.81mm connecting terminal)
23
3T+(3-485-A)
The third serial port RS485 data interface terminal A/ RS422 data transmission (A +) interface (3.81mm
connecting terminal)
24
3T-(3-485-B)
The third serial port RS485 data interface terminal B/ RS422 data transmission (B-) interface (3.81mm
connecting terminal)
25
GND2
The the third and fourth signal reference ground (3.81mm connecting terminal)
26
3R+
The third serial port RS422 data receiving (A +) (3.81mm connecting terminal)
27
3R-
The third serial port RS422 data receiving (B-) interface (3.81mm connecting terminal)
28
PE
Connect to the earth (3.81mm connecting terminal)
29
PE
Connect to the earth (3.81mm connecting terminal)
30
DC-IN(-)
Power terminal ground (3.81mm connecting terminal)
31
DC-IN(+)
Positive terminal of power connection terminal, can not supply power with power socket at the same time
(3.81mm connecting terminal)
32
DC-IN
Power socket, cannot be powered at the same time as the power terminal
LED Indicator
1
TX1
The First serial port data sending indicator
2
RX1
The first serial port data receiving indicator
3
RX2
The second serial port data receiving indicator
4
TX2
The second serial port data sending indicator
5
UART1
The first serial port data receiving and sending indicator
6
UART2
The second serial port data receiving and sending indicator
7
RL
Factory reset indicator
8
PWR
Power Indicator
9
TX3
The third serial port data sending indicator
10
RX3
The third serial port data receiving indicator
11
RX4
The fourth serial port data receiving indicator
12
TX4
The fourth serial port data sending indicator
13
UART3
The third serial port data receiving and sending indicator
14
UART4
The fourth serial port data receiving and sending indicator
15
DATA
Network data receiving and sending indicator
16
LINK
Network connection indicator

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2.3. Connection method
2.3.1. RS232 connection
Note: Network port 232 interface wiring sequence

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2.3.2. RS485 Connection
2.3.3. RS422 Connection
Note: When using full-duplex (RS422) or half-duplex (RS485) wiring, in order to prevent signal reflection
and interference, a matching resistor (parameter 120 1 / 4W) must be connected to the line terminal!
3. Introduction to basic network functions
3.1 IP Address/Subnet mask/Gateway
1. IP address is the identity of DTU in LAN. It is unique in LAN and thus cannot be duplicated with other devices in the
same LAN.
IP address of E810 (4RS1E) can be obtained by static IP or DHCP.

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（1）Static IP
Static IP needs to be manually set by users. During the setting process, pay attention to write the IP, subnet mask, and
gateway at the same time. It is applicable for scenarios where IP and equipment need to be counted and corresponded.
Advantages: Access to devices that cannot automatically assign IP addresses can be searched through the full network
segment broadcast mode;
Disadvantages: Different IP network segments in different LANs will cause normal TCP / UDP communication not
possible.
（2）DHCP
The main function of DHCP is to dynamically obtain the IP address, Gateway address, DNS server address and other
information from the gateway host, thereby eliminating the tedious steps of setting IP address. It is applicable to scenarios where
there is no requirement on IP and it is not mandatory to have correspondence between IP and DTU.
Advantages: Devices such as access routers that have a DHCP server can communicate directly, reducing the trouble of
setting the IP address gateway and subnet mask;
Disadvantages: E810 (4RS1E) will not work properly when connected to a network without DHCP Serve, such as directly
connected to a computer.
2. Subnet mask is mainly used to determine the network number and host number of the IP address, indicate the number of
subnets, and determine whether the DTU is in the subnet. Subnet mask must be set, the commonly used class C subnet mask:
255.255.255.0, the network number is the first 24 digits, the host number is the last 8 digits, the number of subnets is 255, and
DTUIP is in the range of 255, it is considered to be in this subnet.
3.Gateway refers to the network number of the network where the current IP address of DTU is located. The gateway is the
router's IP address if connected to a device such as a router when connecting to the external network. External network cannot be
accessed correctly if the setting is incorrect. No setting is required(Default) if a device such as a router is not connected.
3.2 DNS Server address
DNS server is mainly used to translate domain names into network-recognizable IP addresses. DNS server address can be set
to enable domain name resolution if the local domain name server is incomplete. Users can also set a specific DNS server address
according to their needs. E810 (4RS1E) will submit a resolution request to the set DNS server when domain name resolution is
required, which is more flexible and reliable to use.
In the static IP mode, the default DNS server address is 61.139.2.69, and the standby DNS server address is 192.168.4.1. In
the DHCP mode, the DNS server address is obtained automatically. DTU supports that domain name server address can be set.
4. Socket Functional characteristics
E810 (4RS1E) has four socket operating modes: TCP Client, TCP Server, UDP Client, UDP Server, which can be configured
through the web interface.

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4.1. TCP Server Mode characteristic
Diagram 4-2 TCP Server
(1) TCP Server is TCP server. In TCP Server mode, E810 (4RS1E) monitors the local port. It accepts and establishes a connection
for data communication when there is a connection request. When E810 (4RS1E) serial port receives data, it will send the data to
all client device that have established the connection with it.
(2) It is usually used for communication with TCP clients in LAN. It is applicable for the scenario where there is no server in
LAN and there are multiple computers or mobile phones requesting data from the server. Like TCP Client, there are differences
between connection and disconnection to ensure reliable exchange of data.
(3) When E810 (4RS1E) is used as TCP Server, it can accept a maximum of 6 Client connections. The local port number is a fixed
value and cannot be set to 0.
4.2. TCP Client Mode characteristic
Diagram 4-3 TCP Client
(1) TCP Client provides client connection for TCP network services, actively initiate a connection request to the server and
establish a connection, which is used to implement serial port data and server data interaction. According to the relevant
provisions of TCP protocol, TCP Client is distinguished from connected and disconnected, thereby ensuring reliable exchange of
data. It is usually used for data interaction between the device and the server and the most commonly used network
communication method.
(2) When E810 (4RS1E) attempts to connect to the server in TCP Client mode and the local port is 0, the connection is initiated
through a random port each time.
(3) This mode supports short connection function.

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(4) Under the same LAN, if E810 (4RS1E) is set to static IP, please keep the IP of E810 (4RS1E) and the gateway on the same
network segment, and set the gateway IP correctly, otherwise communication will not be normal.
4.3. UDP Server Mode characteristic
Diagram 4-4 UDP Server
(1) UDP Server means that the source IP address is not verified on the basis of ordinary UDP. After receiving a UDP data packet
each time, the destination IP is changed to the data source IP and port number. When sending data, send to the IP and port number
of the most recent communication.
(2) This mode is usually used for data transmission scenarios where multiple network devices need to communicate with DTU and
do not want to use TCP due to the fast frequency.
4.4. UDP Client Mode characteristic
Diagram 4-5 UDP Client
(1) UDP Client is a connectionless transmission protocol that provides transaction-oriented simple and unreliable information
transmission services. There is no connection and disconnection establishment. IP and port needed to be specified can send data to
the other party. Usually used for data transmission scenarios where there is no requirement for packet loss rate, data packets are
small and transmission frequency is fast, and data is to be transmitted to the specified IP.
(2) In UDP Client mode, E810 (4RS1E) will only communicate with the target port of the target IP. If the data is not from this
channel, the data will not be received by E810 (4RS1E).
(3) In UDP Client mode, if the destination address is set to 255.255.255.255, the effect of UDP full network segment broadcast
can be achieved, and broadcast data can be received at the same time. E810 (4RS1E) DTU supports broadcast within network
segment, for example, xxx. the broadcast mode of xxx.xxx.255.

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5. Special functions
5.1. Short connection
The use of TCP short connections is mainly to save server resources and is generally applied in multi-point-to-point scenarios.
The use of short connections can ensure that all existing connections are useful connections and do not require additional control
means for filtering.
TCP short connection function is applied in the TCP Client mode. After the short connection function is enabled, the
information is sent. If there is no data received by the serial port or network port within the set time, the connection will be
automatically disconnected. The short connection function is turned off by default. The disconnection time can be set after the
function is turned on. The setting range is 2 ~ 255S.
5.2. Registration packet mechanism
In the network transparent transmission mode, users can choose to let DTU send a registration packet to the server. The
registration packet is to enable the server to identify the data source device or as a password to obtain server function
authorization.
E810 (4RS1E) has 4 registration packet mechanisms:
Send MAC on connection: DTU will send the MAC address of DTU itself to the device once the connection is
established.
Send custom data on connection:DTU will send user-defined data to the device once the connection is established
Send MAC per packet data: dd DTU MAC address before each frame of data sent by DTU
Send custom data for each packet of data:User-defined data is added before each frame of data sent by DTU
Establishing a connection and sending a registration packet are mainly applied to connect to a server that needs to be
registered. The data carrying registration packet refers to the access to the registration packet at the forefront of the data when
sending data, is mainly used for protocol transmission. The user-defined data packet defaults to hexadecimal data (ASCII code is
optional), and the maximum packet length is 40 bytes.
5.3. Heartbeat packet mechanism
In the network transparent transmission mode, users can choose to let E810 (4RS1E) send heartbeat packets. The heartbeat
packet can be sent to the network server side or the serial port device side, and cannot be run simultaneously.
Network heartbeat packet: Send heartbeat packets to the network. DTU sends heartbeat packet data to the network server to
maintain the connection with the network server under the set heartbeat sending period. It only takes effect in TCP Client and
UDP Client modes.
Serial port data packet: DTU sends heartbeat packet data to the serial port in the set heartbeat sending period. After receiving
the heartbeat data from the serial port, users can do the corresponding processing.
In applications where the server sends fixed query commands to the device, in order to reduce communication traffic, users
can choose to send a heartbeat packet (query command) to the serial port device instead of sending the query command from the
server.

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User-defined data packets default to hexadecimal data (ASCII code is optional). E810 (4RS1E) DTU supports user-defined
heartbeat packets with a maximum length of 40 bytes.
5.4. Timeout restart
Timeout restart (no data restart) function is mainly used to ensure the long-term stable operation of E810 (4RS1E). When the
network port cannot receive data or the network has not received data for a long time, E810 (4RS1E) will restart after exceeding
the set time to avoid abnormal conditions affecting communication. The normal working time of this function is set to 60 ~
65535S, and the default value is 300S. When the setting time is less than 60S, it is set to zero by default, that is, the function is
turned off.
5.5. TCP Multi-connection function
TCP multi-connection function is mainly to solve the problem that in TCP Sever mode, users have multiple clients connected
to E810 (4RS1E) and send and receive data at the same time. When E810 (4RS1E) is used as TCP Server, it can establish up to 6
connections at the same time. TCP Server will send data to multiple (no more than 6) TCP Clients on the connection at the same
time. When the number of established connections exceeds 6, the old connection established at the beginning will be actively
disconnected, that is, the old connection is kicked off.
5.6. Clear cache data
When TCP connection is not established, the data received by the serial port will be placed in the cache area. E810 (4RS1E)
serial port receiving cache is 400 bytes. After the TCP connection is established, the serial port cache data can be set to be cleared
according to customer needs.
5.7. Link and data transmission command
Link indicates the network connection status of DTU. In TCP mode, the link is off when network is not connected. When the
connection is established, the link is always on. The Link indicator is always on in UDP mode.
The other one is a data transmission command, which shows the data transmission status of the serial port on DTU. When
there is no data transmission on the serial port, the data transmission indicator turns off. When there is data transmission on the
serial port, the flashing indicates that its period is 60ms and the indicator is on for 10ms. As shown below. (补充图片)
5.8. KeepAlive Function
Keep-Alive is a mechanism for detecting dead connections in TCP connections. When users do not send any data, TCP link
will periodically send "Keep-Alive" information to maintain the idle link and avoid dead connections consuming unnecessary
system resources. This setting is valid under TCP. Users can customize the Keep-Alive switch and other parameters.
Keepalive parameters:
time：Start probe message after how many seconds the TCP link has no data message transmitted ;

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intv：Time interval between the previous probe message and the next probe message;
probes：Maximum number of probe failures. When the number of sniffing failures reaches this number, TCP connection
will be disconnected.
5.9. Modbus TCP to TU function
The device supports conversion between Modbus RTU and Modbus TCP. After the function is enabled, the device receives
the data and checks whether the data meets the requirements of Modbus RTU (Modbus TCP) protocol. After the verification is
successful, Modbus RTU data is converted to Modbus TCP, and Modbus TCP data is converted to Modbus RTU data.
5.10. Restore factory setting
There are two methods for DTU restore factory setting: software restore factory setting and hardware restore factory setting:
1 In hardware restore factory setting mode, press Restore button for 5s ~ 15s; 2 conduct restore factory setting through the web
interface.
6. Quick instructions
6.1. Parameter setting instruction
DTU is configured by using web interface. Enter 192.168.4.101 in the browser to configure the interface.
6.2. Socket Instruction
Preparations：
1. Set the IP address of the PC (computer) to the same network segment as E810 (4RS1E) DTU and the same subnet mask. For
example, the PC IP is 192.168.4.100 and the DTUIP is 192.168.4.101.
PC configuration：

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Figure 6-1
DTU configuration：
Figure 6-2
6.2.1. TCP Server Instruction
(1)We take a single serial port and serial port 1 as TCP server as an example. Connect E810 (4RS1E) to the PC with a
network cable, open the network configuration interface, set the parameters according to the figure below, and save.

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Figure 6-3 Parameter setting
(2) Open the serial debugging assistant and the network debugging assistant, set the parameters of the serial assistant to the
parameters set by DTU just now, open the serial port, set the protocol type of the network debugging assistant to TCP Client, and
set the server IP address of the network debugging assistant to DTU IP address, the server port of the network debugging assistant
is set to the local port of DTU, and click Connect.
(3) Enter a string of data in the sending area of the serial port debugging assistant and click Send. Users can see that the
network assistant received the same data in the sending area of the serial port debugging assistant. Enter a string of data in the
sending area of the network debugging assistant, the serial port assistant also receives the same data in the network transmission
area and realizes two-way transparent transmission.

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Figure 6-4 Data transparent transmission
6.2.2. TCP Client Instruction
(1) Similarly, we take a single serial port and serial port 1 as TCP Client as an example. Connect E810 (4RS1E) to the PC
with a network cable, open the network configuration interface, set the parameters according to the figure below, and save.
Figure 6-5 Parameter setting
(2) Open the serial port debugging assistant and the network debugging assistant, set the parameters of the serial port
assistant to the parameters set by DTU just now, open the serial port, set the protocol type of the network debugging assistant to
TCP Server, and set the local IP address of the network debugging assistant to DTU, the local port of the network debugging
assistant is set to the destination port of the DTU, and click Connect.
(3) Enter a string of data in the sending area of the serial debugging assistant and click Send. Users can see that the network
assistant received the same data in the sending area of the serial port debugging assistant. Enter a string of data in the sending area
of the network debugging assistant, the serial assistant also receives the same data in the network transmission area and realizes
two-way transparent transmission.

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Figure 6-6 Data transparent transmission
6.2.3. UDP Server Instruction
(1) Similarly, we take a single serial port and serial port 1 as UDP server as an example. Connect E810 (4RS1E) to the PC
with a network cable, open the network configuration interface, set the parameters according to the figure below, and save.
Figure 6-7 Parameter setting

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(2) Open the serial port debugging assistant and the network debugging assistant, set the parameters of the serial port
assistant to the parameters set by DTU just now, open the serial port, set the protocol type of the network debugging assistant to
UDP, the local IP address of the network debugging assistant is set to the local IP address of the PC. The local port of the network
debugging assistant is set to 8700. Click Connect.
(3) Enter a string of data in the sending area of the serial debugging assistant and click Send. Users can see that the network
assistant received the same data in the sending area of the serial port debugging assistant. Enter a string of data in the sending area
of the network debugging assistant, the serial assistant also receives the same data in the network transmission area and realizes
two-way transparent transmission.
Diagram 6-10 Data transparent transmission
6.2.4. UDP Client Instruction
(1) Similarly, we take a single serial port and serial port 1 as the UDP server as an example. Connect E810 (4RS1E) to the
PC with a network cable, open the network configuration interface, set the parameters according to the figure below, and save.