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:

：