Ebyte E90-DTU User manual

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 2
Contents
1. Product Overview............................................................................................................................................................... 3
1.1 Introduction...............................................................................................................................................................3
2. Parameter............................................................................................................................................................................ 3
2.1 General parameter.....................................................................................................................................................3
2.2 Wireless parameter....................................................................................................................................................4
2.3 Dimension and pin definition................................................................................................................................... 5
2.4 Connection method...................................................................................................................................................6
3 Product function...................................................................................................................................................................7
3.1Basic function............................................................................................................................................................ 7
3.1.1SOCKET.........................................................................................................................................................7
3.1.2TCP Client...................................................................................................................................................... 7
3.1.3TCP Server......................................................................................................................................................7
3.1.4UDP Client......................................................................................................................................................8
3.1.5UDP Server..................................................................................................................................................... 9
3.1.6WOR role........................................................................................................................................................9
3.1.7Fixed point transmission.................................................................................................................................9
3.1.8Broadcasting and Monitoring....................................................................................................................... 10
3.1.9Communication key......................................................................................................................................10
3.1.10Enable repeater........................................................................................................................................... 10
3.1.11Enable LBT.................................................................................................................................................10
3.1.12Enable RSSI byte........................................................................................................................................10
3.1.13Enable RSSI environment noise................................................................................................................. 10
3.2Featured function.....................................................................................................................................................11
3.2.1web page configuration................................................................................................................................ 11
3.2.2Heartbeat function........................................................................................................................................ 11
3.2.3Registration package function...................................................................................................................... 12
3.2.5Short connection function.............................................................................................................................12
3.2.6KeepAlive function.......................................................................................................................................13
3.2.7Timeout restart function............................................................................................................................... 13
3.2.8Clearing the cache function.......................................................................................................................... 13
3.2.9Link/ data transmission indication................................................................................................................13
3.2.10Restore to factory setting............................................................................................................................14
4Quick Start.......................................................................................................................................................................... 14
4.1Default parameter.................................................................................................................................................... 14
4.2SOCKET instruction................................................................................................................................................15
4.3TCP Client guidance................................................................................................................................................15
4.4TCP Server guidance............................................................................................................................................... 17
4.5UDP Client guidance............................................................................................................................................... 18
4.6UDP Server guidance.............................................................................................................................................. 20
4.7WEB introduction....................................................................................................................................................21
Revision history....................................................................................................................................................................24
About us................................................................................................................................................................................24

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 3
1. Product Overview
1.1 Introduction
The E90-DTU (230SL22-ETH) supports adaptive network speed (up to 100M
full-duplex) and provides four working modes: TCP Server, TPC Client, UDP Server, and
UDP Client. It also supports two-way SOCKET work. The wireless communication adopts
LoRa direct sequence spread spectrum technology, which will bring longer communication
distance and has the advantages of concentrated power density and strong anti-interference
ability. It has a software FEC forward error correction algorithm, which has high coding
efficiency and strong error correction capability. In the case of sudden interference, it can actively correct the interfered data packets,
greatly improving reliability and transmission distance, and helping users to efficiently Complete transparent transmission of
long-distance data. Users can configure it through the WEB webpage.
2. Parameter
2.1 General parameter
No
Item
Specification
1
Power supply
8V~28VDC，will burn over 28V，12V or 24V is recommended
2
Ethernet specification
RJ45，support 10/100Mbps
3
Network protocol
IP、TCP/UDP、ARP、ICMP、IPV4
4
Simple transparent
transmission
TCP Server、TCP Client、UDP Server、UDP Client
5
TCP Server connection
Max of 6 channel TCP connection
6
IP acquisition method
Static IP、DHCP
7
DNS
Available
8
Configured by user
Web page configuration
9
Antenna interface
SMA
10
Operating temperature
-40 ~ +85℃
11
Operating humility
10% ~ 90%，Relative humidity, no condensation
12
Size
84mm*82mm*25mm
13
Average weight
130g
15
Storage temperature
-40～+125℃

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 4
2.2 Wireless parameter
Main parameter
Performance
Remark
Min.
Typ.
Max.
Blocking power（dBm）
-
-
10
Chances of burn is slim
when modules are used in
short distance
Frequency（MHz）
410.125
493.125
ISM band
Power
consum
ption
TX current
（mA）
109.7mA@12V
Instant power consumption
RX current
（mA）
70.1mA@12V
Max tx power（dBm）
21.5
22.0
22.5
Receiving sensitivity
（dBm）
-147
-148
-149
Air data rate 0.3 kbps
Air data rate（bps）
0.3k
2.4k
62.5k
Configured by user
Distance
5000m
In open and clear air，
antenna gain 5dBi，at height
of 2.5 m，air data rate 2.4
kbps
Transmission length
240 Byte
Can be set as 32/64/128/240
bytes each packet
Receiving length
1000 Byte
Modulation method
New generation LoRa

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 5
2.3 Dimension and pin definition

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 6
No.
Name
Specification
1
DC-IN
Power supply ，default 8-28V （5V can be customized ） ， recommend
12V/24V
2
ETHERNET
RJ45 , to connect to PC or other device
3
PWR
Power indicator
4
LINK
Connection indicator
5
DATA
Serial port TX and RX indicator
6
Reload
Restore to factory setting
7
ANT
SMA
2.4 Connection method

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 7
3 Product function
3.1Basic function
→Ethernet
3.1.1SOCKET
E90-DTU-(230SL22-ETH) can establish two Sockets, namely Socket A1 and Socket B1. Among them, Socket A1 supports TCP
Client, TCP Server, UDP Client, and UDP Server. Socket B1 only supports TCP Client, UDP Client, and UDP Server.
Two Sockets run simultaneously. It can be connected to different networks at the same time for data transmission.
3.1.2TCP Client
(1) The TCP Client provides a client connection for the TCP network service. Proactively initiate a connection request to the server
and establish a connection for interaction between the wireless data and the server data. According to the relevant provisions of the
TCP protocol, the TCP Client has the difference of connection and disconnection, thereby ensuring reliable exchange of data. It is
commonly used for data interaction between devices and servers and is the most commonly used method of networked
communication.
(2) E90-DTU-(230SL22-ETH) When attempting to connect to the server in TCP Client mode and the local port is 0, the connection
is initiated with a random port each time.
(3) E90-DTU-(230SL22-ETH) supports short connection function.
(4) Under the same LAN, if E90-DTU-(230SL22-ETH) is set to static IP, please keep the IP and gateway of
E90-DTU-(230SL22-ETH) on the same network segment, and set the gateway IP correctly, otherwise Will not communicate properly.
3.1.3TCP Server
(1) TCP Server is a TCP server. In TCP Server mode, E90-DTU-(230SL22-ETH) listens to the local port, accepts and establishes
connection for data communication when the connection request is sent. When E90-DTU-(230SL22-ETH) receives the data, it will be
Send data to all client devices that are connected to the E90-DTU-(230SL22-ETH).
(2) Usually used for communication with TCP clients in the LAN. It is suitable for scenarios where there is no server in the LAN
and there are multiple computers or mobile phones requesting data from the server. As with TCP Client, there is a difference between

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 8
connection and disconnection to ensure reliable exchange of data.
(3) When E90-DTU-(230SL22-ETH) is used as TCP Server, it can accept up to 6 Client connections (the number of connections
can be customized). The local port number is a fixed value and cannot be set to 0.
(4) TCP Server can set the maximum number of connections. When the maximum number of connections is reached, you can
choose to kick off the old connection or disable the new connection function according to the command configuration.
3.1.4UDP Client
(1) UDP Client A connectionless transmission protocol that provides a transaction-oriented simple and unreliable information
transmission service. Without the establishment and disconnection of a connection, only the IP and port need to be established to send
data to the other party. It is usually used for data transmission scenarios where the packet loss rate is not required, the data packet is
small and the transmission frequency is fast, and the data is transmitted to the specified IP.
(2) In UDP Client mode, E90-DTU-(230SL22-ETH) 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 E90-DTU-(230SL22-ETH).
(3) In the UDP client mode, the destination address is set to 255.255.255.255, which can achieve the effect of UDP full network
segment broadcast, and can also receive broadcast data. The E90-DTU-(230SL22-ETH) module supports the support network segment.
Broadcast, such as xxx.xxx.xxx.255 broadcast mode.

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 9
3.1.5UDP Server
(1) UDP Server means that the source IP address is not verified on the basis of ordinary UDP. After receiving a UDP packet, the
target IP is changed to the data source IP and port number. When the data is sent, the latest communication is sent. That IP and port
number.
(2) This mode is usually used for data transmission scenarios where multiple network devices need to communicate with the
module and do not want to use TCP due to faster speed.
Note: UDP Server cannot send data actively, and can only send data to the IP and port that has recently performed data interaction
after receiving the data.
→Wireless
3.1.6WOR role
(1) WOR is closed. The DTU works in the transmission mode, and the data input by the user through the Ethernet, the DTU will
initiate wireless transmission. The wireless receiving function is turned on, and the wireless data is received and output through the
Ethernet.
(2) WOR transmitter. The DTU is sent and received, and when the data is transmitted, a wake-up code is added for a certain period
of time.
(3) WOR receiver. The DTU cannot transmit data, works in the WOR listening mode, and the listening period is selected on the
web side. The longer the WOR listening interval period,
The lower the average power consumption, but the greater the data delay, the two sides must be consistent (very important).
3.1.7Fixed point transmission
It supports address function, the master can transmit data to any address, any channel module, to achieve networking, relay and
other application methods: for example: module A needs to send data to module B (address is 0x00 01, channel is 0x80) AA BB CC
The communication format is: 00 01 80 AA BB CC, where 00 01 is the module B address and 80 is the module B channel, then
module B can receive the AA BB CC (other modules do not receive data).

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 10
3.1.8Broadcasting and Monitoring
Set the DTU radio address to 0xFFFF: It can monitor the data transmission of the module on the same channel; the transmitted
data can be received by the module at any address on the same channel, thus playing the role of broadcasting and monitoring.
3.1.9Communication key
Only write is allowed, the web end always displays 0x0000, and the communication key is used for user encryption to avoid
intercepting airborne wireless data by similar modules. The DTU internally uses these two bytes as a calculation factor to transform
and encrypt the over-the-air wireless signal.
3.1.10Enable repeater
After the repeater is enabled, if the target address is not the module itself, the module will initiate a forward. In order to prevent
data backhaul, it is recommended to use it in conjunction with the fixed point mode. That is: the destination address is different from
the source address.
3.1.11Enable LBT
The DTU has a Listen before talk (LBT) function. When this function is enabled, the channel environment noise will be actively
monitored before the wireless data is transmitted. If the noise exceeds the threshold, the transmission will be delayed. This function
can greatly improve the communication success rate of the DTU in harsh environments. It can be used for network transmission,
anti-collision processing, but may bring data delay, LBT maximum dwell time 2 seconds
3.1.12Enable RSSI byte
It is the signal strength indication function. When enabled, the STU wirelessly receives the data and will follow an RSSI strength
byte. It can be used to evaluate signal quality, improve communication networks, and range, and can be used to manually implement
LBT functions.
3.1.13Enable RSSI environment noise
When enabled, the C0 C1 C2 C3 instruction can be used to read the register in transfer mode or WOR transmit mode.
⚫Register 0x00 ：current rssi of environment noise
⚫Register 0x01 ：rssi for receiving data last time（current channel noise is：dBm =-RSSI/2）
⚫Command format：C0 C1 C2 C3 + starting address + read length
⚫Return：C1 + address address+read length+read valid value；for example：send C0 C1 C2 C3 00 01
⚫Return C1 00 01 rssi

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 11
3.2Featured function
3.2.1web page configuration
The DTU can be accessed through a browser to configure the web page. The access terminal and the module are in the same local
area network when users visit the web. After entering 192.168.4.101, the user name and password, the web configuration page is
entered.
3.2.2Heartbeat function
In the network transparent transmission mode, heartbeat packet can be sent by E90-DTU-(230SL22-ETH). The heartbeat packet
can be sent to the web server. The main purpose is to maintain a connection with the server, which only takes effect in the TCP Client
and UDP Client modes. The E90-DTU-(230SL22-ETH) module supports up to 40 bytes of custom heartbeat packets.

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 12
3.2.3Registration package function
In network transparent transmission mode, the user can use the DTU to send a registration packet to the server. The registration
package is for the server to recognize the data source device or to obtain a password for the server function authorization. The
registration packet can be sent when the DTU establishes a connection with the server, or it can be spliced into the registration packet
data at the forefront of each packet as a data packet. The data of the registration package can be a MAC address or a custom
registration data, wherein the custom registration package setting content is up to 40 bytes.
Establishing a connection by sending a registration package is mainly used to connect servers that need to be registered.
Data carrying registration package: The sending data accesses the registration package at the front end of the data, and is mainly
used for protocol transmission.
The registration package mechanism is only available for TCP Client and UDP Client, not valid under TCP Server and UDP
Server.
3.2.5Short connection function
The use of TCP short connections is mainly to save server resources, and is generally applied to a multi-point scenario. With short
connections, you can ensure that the existing connections are useful connections and do not require additional controls for filtering.
The TCP short connection function is applied to the TCP Client mode. After the short connection function is enabled, the message
is sent. If there is no data reception in 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, and the disconnection time can be set after the function is turned
on. The setting range is 2~255S.

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 13
3.2.6KeepAlive function
Keep-Alive is the mechanism for detecting dead connections in a TCP connection. When the user does not send any data, the
"Keep-Alive" information is periodically sent on the TCP link to maintain the idle link, avoiding dead connections and consuming
unnecessary system resources. This setting is valid under TCP. Users can customize the Keep-Alive switch and other parameters.
keepalive parameter introduction：
time：How many seconds after the TCP link does not receive data packet transmission to start the probe packet；
intv：Time interval between the previous probe packet and the next probe packet；
probes ：The maximum number of probe failures. When the sniffing fails to this number, the TCP connection will be
disconnected.。
3.2.7Timeout restart function
The timeout restart (no data restart) function is mainly used to ensure that the E90-DTU-(230SL22-ETH) works stably for a long
time. When the network port does not receive data for a long time, or the network does not receive data for a long time,
E90-DTU-( The 230SL22-ETH) will restart after the set time has elapsed to avoid anomalies affecting communication. The timeout
timeout can be set through the webpage. The normal working time of this function is set to 60~65535S, and the default value is 3600S.
0 is off, when the setting is out of range, it returns to the default value.
3.2.8Clearing the cache function
When the TCP connection is not established, the data received by the DTU will be placed in the buffer area. The
E90-DTU-(230SL22-ETH) receive buffer is 2Kbyte. When the TCP connection is established, the network cache data can be set or not
according to customer requirements.
The device has two buffer areas, which are the serial data buffer and the network data buffer. When the SOCKET clear cache
function is enabled, only the cache data of the relevant SOCKET link will be cleared, and the serial cache data will not be cleared.
3.2.9Link/ data transmission indication
Link indicates the status of the network connection. In TCP mode, when the network is not connected, the Link is off, and when
the connection is established, the Link is always on. The Link indicator is always on in UDP mode.
The other one is the data transmission indication, showing the transmission status of the DTU. When there is no data transmission
on the DTU, the data transmission indicator is off. When there is data transmission on the DTU, the flashing indicates that the period is

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 14
60ms and the indicator is on for 10ms.
3.2.10Restore to factory setting
The DTU is restored to the factory settings either by software or by button.
4Quick Start
4.1Default parameter
IP acquisition type
STATIC
IP address
192.168.4.101
Subnet mask
255.255.255.0
Gateway
192.168.4.1
DNS
61.139.2.69
Spared NDS
192.168.4.1
Socket A1 basic parameter
TCPS,192.168.4.101,8886
Socket A1 heartbeat package mode
NET
Socket A1 heartbeat package content
0（s），turn off heartbeat
Socket A1 register package mode
heartbeat msg
Socket A1 register package time
Turn off
Socket A1 register package content
regist msg
Socket A1 short connection time
0（s），turn off short connection
Socket A1 keepalive parameter
time/inteval/probes = 10（s）/5（s）/30（times）
Socket A1 clear the cache
OFF
Socket B1 basic parameter
TCPC,192.168.4.100,8887
Socket B1 heartbeat mode
NET
Socket B1 heartbeat package time
0（s），turn off heartbeat
Socket B1 heartbeat package content
heartbeat msg
Socket B1 register package mode
Turn off
Socket B1 register package content
regist msg
Socket B1 short connection time
0（s），turn off short connection

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 15
Socket B1 keepalive parameter
time/inteval/probes = 10（s）/5（s）/30（times）
Socket B1 clear the cache
OFF
Tcp server max connection number
6（number）
Intranet discovery port
1901
Intranet discovery command
www.cdebyte.comwww.cdebyte.com
Web page port
80
Web login user name/password
admin/admin
Overtime resetting time
3600（s）
4.2SOCKET instruction
Preparation：
1. Set the IP address of the PC to the same network segment as E90-DTU (SL), and the subnet mask is the same. For example,
the IP of the PC is 192.168.4.100, and the IP of the module is 192.168.4.101.；
Configured on PC：
Configured on DTU：
4.3TCP Client guidance
1、Open “Network Debugging Assistant”on Computer A and Computer B, set the protocol type to TCP Server, and set the local IP

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 16
and port to 192.168.4.100 and 8886 respectively.
2. Set the SOCKET A1 network type of device A and device B to TCP Client, the destination IP address is 192.168.4.100, the
local port 0 (random port), and the destination port 8886. Click Save to restart the module.
3、The DTU is connected via Network Debugging Assistant for communication test as shown below.

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 17
4.4TCP Server guidance
1. Set the” network debugging assistants “ on computer A and computer B as TCP Client, the remote host IP is set to
192.168.4.101, and the remote host port number is set to 8886.
2、Set the SOCKET A1 network type of Device A and Device B to TCP Server and local port 8886. Click Save to restart the
module.。

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 18
3、The DTU is connected via Network Debugging Assistant for communication test as shown below.
4.5UDP Client guidance
1、Set “Network Debugging Assistant”as UDP（no need to tell UDP Client and UDP Server），set IP of master as 192.168.4.100，
local port number as 8887，remote master as 192.168.4.101:8886.

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 19
2. Set the SOCKET A1 network type of device A and device B to UDP Client, the target IP address is 192.168.4.100, and the
destination port is 8887. Click Save to restart the module.
3、The DTU is connected via Network Debugging Assistant for communication test as shown below.

Chengdu Ebyte Electronic Technology Co., Ltd E90-DTU(400SL22-ETH) User Manual
Copyright ©2012–2019, Chengdu Ebyte Electronic Technology Co., Ltd 20
4.6UDP Server guidance
1、Set “Network Debugging Assistant”: as UDP ( no need to tell UDP Client and UDP Server），set local host IP as 192.168.4.101，
local port as 8886，remote host as 192.168.4.101:8887.
2、Set the SOCKET A1 network type of device A and device B to UDPS (UDP Server) and local port 8887. Click Save to restart
the module.