Ebyte E810-dtu User manual

Ethernet to RS485/RS232

E810-DTU

User Manual

This manual may change with the continuous improvement of the product. Please refer to the latest version of the instruction.

Chengdu Ebyte Electronic Technology Co., Ltd. reserves all rights of final interpretation and modification of this manual.

Ethernet to 485/232 E810-DTU User Manual

Version

Date

Description

Issued by

1.00

2018/2/06

Initial version

huaa

Introduction

E810-DTU is a RS485/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 is easy to operate. The user can directly configure the parameters of the module through the host

computer to easily implement data transmission.

Ethernet to 485/232 E810-DTU User Manual

INTRODUCTION...............................................................................................................................................................................1

1. PRODUCT SPECIFICATIONS AND FEATURES....................................................................................................................3

2. INTRODUCTION OF HARDWARE PARAMETERS AND DESIGN.................................................................................... 4

2.1. DESIGN INTRODUCTION............................................................................................................................................................... 4

2.2. PIN DEFINITION............................................................................................................................................................................5

2.3. CONNECTION METHOD.................................................................................................................................................................6

3. NETWORK BASIC FUNCTION INTRODUCTION.................................................................................................................7

3.1 IP ADDRESS/SUBNET MASK/GATEWAY..........................................................................................................................................7

3.1. 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................................................................................................................................................10

4.4. UDP CLIENT CHARACTERISTICS................................................................................................................................................ 11

5. SPECIAL FUNCTION................................................................................................................................................................ 11

5.1. SHORT CONNECTION.................................................................................................................................................................. 11

5.2. REGISTRATION PACKET MECHANISM......................................................................................................................................... 11

5.3. HEARTBEAT MECHANISM.......................................................................................................................................................... 13

5.4. OVERTIME RESTART................................................................................................................................................................... 13

5.5. TCP MULTI-CONNECTION FUNCTION......................................................................................................................................... 13

5.6. CLEARING CACHED DATA.......................................................................................................................................................... 13

5.7. LINK AND DATA TRANSFER INSTRUCTIONS................................................................................................................................ 13

6. QUICK INSTRUCTIONS...........................................................................................................................................................14

6.1. PARAMETER SETTING INSTRUCTION...........................................................................................................................................14

6.2. SOCKET INSTRUCTIONS.............................................................................................................................................................. 14

6.3. SPECIAL FUNCTION INSTRUCTIONS............................................................................................................................................ 23

7. AT COMMAND........................................................................................................................................................................... 27

7.1. AT COMMAND SUMMARY.......................................................................................................................................................... 27

7.2 AT COMMAND ERROR CODE........................................................................................................................................................27

7.3 AT COMMAND SET...................................................................................................................................................................... 27

7.2. AT COMMAND DETAILED INSTRUCTIONS................................................................................................................................... 28

8. IMPORTANT NOTES..................................................................................................................................................................33

9. ABOUT US.................................................................................................................................................................................... 33

Ethernet to 485/232 E810-DTU User Manual

1. Product specifications and features

No.

Specification

Description

Size

66 * 66 *21.6mm

Weight

79±1g

PCB process

2 layer，SMT, lead-free

Connector

RS485/RS232：1*5*3.81mm，Screwing

Supply voltage

8~28V DC，Note：Higher than 28V will cause permanent damage

UART standard

1200~256000 bps

UART communication

level

3.3V，communication level need to switch for 5V

Ethernet specification

RJ45，10/100Mbps

Network protocol

IP、TCP/UDP、ARP、ICMP、IPV4

IP Acquisition

Static IP、DHCP

DNS

Available

User configuration

PC software , AT command configuration

Simple transparent

transmission

TCP Server 、TCP Client 、UDP Server 、UDP Client

TCP Server

connection

Max. 6 channel TCP connection

Software

RF Setting

Package mode

200 bytes per package

Operating current

77.0314mA@12V(RS485) ，74.5635mA@12V(RS232)

Operating temperature

-40 ~ +85℃

Operating humidity

10% ~ 90%，relative humidity, no condensation

Storage temperature

-40 ~ +125℃

Ethernet to 485/232 E810-DTU User Manual

2. Introduction of hardware parameters and design

2.1. Design Introduction

No.

Item

Description

VCC

Power supply, default power 8~28V (customizable standard 5V version)

GND

Ground electrode, connect to reference ground of power

GNDA

RS232 common, connecting the GND of other RS232 devices

B/TXD

Connecting the RS/RS232 output of other RS485 devices or connecting the RXD of other RS232 devices

A/RXD

Connecting RS-485 device's A-side/RS232 input, or connecting other RS232 devices' TXD

PWR

Power indicator

LED1

Remote connection indicator

LED2

Serial transmitting and receiving indicator

RJ45

RJ45 interface with network transformer

SWITCH

All configuration parameters of the module are restored to factory settings

VCC

DC power port, it is recommended to use standard 12V or 24V power supply

Ethernet to 485/232 E810-DTU User Manual

2.2. Pin Definition

Ethernet to 485/232 E810-DTU User Manual

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.

Ethernet to 485/232 E810-DTU User Manual

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’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 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.

4. Software setting

Figure 1 Parameter setting software

Ethernet to 485/232 E810-DTU User Manual

Figure 2 Parameter setting interface

3.1. 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 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-0 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:

：

Ethernet to 485/232 E810-DTU User Manual

Figure 3 Setting interface

4.1. TCP Server characteristics

Ethernet to 485/232 E810-DTU User Manual

Figure 5 TCP Server

(1) In TCP Server mode, E810-DTU monitors the local port, receiving and establishing a connection for data communication when a connection request is sent. When

the E810-DTU serial port receives data, it will transmit data to all client devices which established a connection with the E810-DTU.

(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 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 6 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 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 is set to static IP, please keep the E810-DTU IP and gateway in the same network segment and set the gateway IP correctly,

otherwise it cannot communicate normally.

4.3. UDP Server characteristics

Ethernet to 485/232 E810-DTU User Manual

Figure 7 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 8 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, and data is transmitted to a specified IP.

(2) In UDP Client mode, the E810-DTU 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.

(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 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 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 data sent.

Ethernet to 485/232 E810-DTU User Manual

Figure 8 Sending MAC when connecting

Figure 9 Sending user-defined data when connecting

Figure 10 Each packet of data sending MAC

Figure 11 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.

Ethernet to 485/232 E810-DTU User Manual

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 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. 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 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 and send and receive data at the same

time. When E810-DTU 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.

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 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.

Ethernet to 485/232 E810-DTU User Manual

6. Quick instructions

6.1. Parameter setting instruction

Figure 12 Parameter setting instructions

6.2. Socket instructions

6.2.1. TCP Server instructions

(1) Connect two E810-DTU cable to the PC. Open the network configuration software and search for the device. The searched device will be displayed in the

device list. Double-click the device to be configured in the list, enter the setting interface, and set the module to TCP Server mode, Set the module IP address to

192.168.4.101, 192.168.4.102, set the module's local port to 8886, set the RF parameters. After the setting is complete, click the OK button, then restart the device and

search again to see if the parameter modification was successful.

Ethernet to 485/232 E810-DTU User Manual

Figure 13 Searching devices

Figure 14 Network port parameter settings

Click Read Parameters on the RF Parameter Settings interface to obtain the module's current RF parameter settings, then you can configure the RF settings.

Ethernet to 485/232 E810-DTU User Manual

Figure 15 RF Parameter configuration settings

(2) Open two network debugging assistants, set the network debugging assistant protocol type to TCP Client, the network debugging assistant's server IP address is set

to the module's IP address, the network debugging assistant's server port is set to the module's local port, click Connect.

(3) Enter a string of data in the sending area of network debugging assistant A, click Send, you will see that network assistant B has received the same data in the

sending area of the serial port. Input a string of data in the sending area of network debugging assistant A, network assistant B also received the data. It realizes bidirectional

transparent transmission.

Figure 16 Data transparent transmission

Ethernet to 485/232 E810-DTU User Manual

6.2.2. TCP Client instructions

(1) Connect two E810-DTU serial ports and network cables to PC, open the network configuration software and search for the device. The searched device will

display the device list. Double-click the device to be configured in the list and enter the setting interface. Set the module to TCP Client mode, set the target IP address to

192.168.3.100, set the target port of module A to 8887, the target port of module B to 8886, set the RF parameters, click the OK button after the setting is complete, and then

restart the device to search Check once to see if the parameter modification was successful.

Figure 17 Searching devices

Figure 18 Parameter settings

Click Read Parameters on the RF Parameter Settings interface to obtain the module's current RF parameter settings. Then you can configure the RF settings.

Ethernet to 485/232 E810-DTU User Manual

Figure 19 RF Parameter configuration settings

(2) Open two network debugging assistants, set the network debugging assistant protocol type to TCP Client, the network debugging assistant's server IP address is set

to the module's IP address, the network debugging assistant's server port is set to the module's local port, click Connect.

(3) Enter a string of data in the sending area of network debugging assistant A, click Send, you will see that network assistant B has received the same data in the

sending area of the serial port. Input a string of data in the sending area of network debugging assistant A, network assistant B also received the data. It realizes bidirectional

transparent transmission.

Figure 20 Data transparent transmission

Ethernet to 485/232 E810-DTU User Manual

6.2.3. UDP Server instructions

(1) Connect two E810-DTU serial ports and network cables to PC, open the network configuration software and search for the device. The searched device will

display the device list. Double-click the device to be configured in the list and enter the setting interface. Set the module to UDP Server mode, set the target IP address to

192.168.3.100, set the target port of module A to 8887, the target port of module B to 8886, set the RF parameters, click the OK button after the setting is complete, and then