Ebyte E90-DTU User manual

Chengdu Ebyte Electronic Technology Co.,Ltd. E90-DTU(400SL33) User Manual
Copyright©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
E90-DTU(400SL33)

Chengdu Ebyte Electronic Technology Co.,Ltd. E90-DTU(400SL33) User Manual
Copyright©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
Contents
Disclaimer .......................................................................................................................................................................4
1、Product introduction...............................................................................................................................................5
1.1. Product introduction........................................................................................................................................5
1.2. Certifications................................................................................................................................................... 5
1.3. Features............................................................................................................................................................5
2、Quick start ...............................................................................................................................................................6
3、Installation size.......................................................................................................................................................9
3.1 Description of each department....................................................................................................................... 9
4、Interface definition ............................................................................................................................................... 11
4.1 Power Interface Description...........................................................................................................................11
4.2 RS232 interface definition..............................................................................................................................11
4.3 RS485 interface definition..............................................................................................................................11
5、Technical indicators..............................................................................................................................................12
5.1 Model Specifications......................................................................................................................................12
5.2 General Specifications....................................................................................................................................12
5.3 Frequency range and number of channels......................................................................................................12
5.4 transmit power level .......................................................................................................................................13
5.5 Air Speed Class.............................................................................................................................................. 13
5.6 Current parameter .........................................................................................................................................13
5.7 Send and receive length and subpackage method..........................................................................................13
6、Detailed function.................................................................................................................................................. 14
6.1 Fixed-point emission (hexadecimal)..............................................................................................................14
6.2 broadcast transmission (hexadecimal) ........................................................................................................... 15
6.3 broadcast address............................................................................................................................................15
6.4 listening address............................................................................................................................................. 15
7、Operating mode .................................................................................................................................................... 15
7.1 General Mode (Mode 0) .................................................................................................................................16
7.2 WOR mode (mode 1)..................................................................................................................................... 16
7.3 Configuration Mode (Mode 2) .......................................................................................................................16
7.4 Deep Sleep Mode (Mode 3)........................................................................................................................... 17
8、Register read and write control............................................................................................................................ 17
8.1 Command format ............................................................................................................................................17
8.2 Register description ........................................................................................................................................18
8.3 Factory Default Parameters............................................................................................................................20
9、Use of relay networking mode............................................................................................................................. 20
10、PC Configuration Instructions ............................................................................................................................22
11、Program the radio ............................................................................................................................................... 23
1.1. Schematic diagram ........................................................................................................................................ 23
12、Schematic diagram of connection in test and practical application ...................................................................24
13、Related Products.................................................................................................................................................24
14、Practical application field ...................................................................................................................................25
15、Precautions for use ............................................................................................................................................. 26
16、Important statement ............................................................................................................................................27

Chengdu Ebyte Electronic Technology Co.,Ltd. E90-DTU(400SL33) User Manual
Copyright©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
About Us .......................................................................................................................................................................27

Chengdu Ebyte Electronic Technology Co.,Ltd. E90-DTU(400SL33) User Manual
Copyright©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

Chengdu Ebyte Electronic Technology Co.,Ltd. E90-DTU(400SL33) User Manual
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1、Product introduction
1.1. Product introduction
E90-DTU (400SL33) is a wireless data transmission radio using military-grade LoRa modulation technology, with a variety of
transmission methods, working in the (410.125~493.125MHz) frequency band (default 433.125MHz), the radio provides transparent
RS232/RS485 interface, support 8~28V voltage input. LoRa direct sequence spread spectrum technology will bring longer
communication distance, and has the advantages of concentrated power density and strong anti-interference ability. The module has a
software FEC forward error correction algorithm, which has high coding efficiency and strong error correction ability, and can actively
correct the jammed packets in the case of sudden interference, greatly improving the reliability and transmission distance. In the
absence of FEC, such packets can only be dropped. The radio station has a data encryption function, and the data transmitted by the
radio in the air has randomness, and the data interception is meaningless through strict encryption and decryption algorithms; Support
subpacket length setting, support different real-time and data packets.
As a communication medium, wireless data transmission radio has a certain scope of application like optical fiber, microwave and
open wire: it provides real-time and reliable data transmission of monitoring signals in the private network under certain special
conditions, with low cost, convenient installation and maintenance, strong diffraction ability, flexible networking structure, long
coverage characteristics, suitable for many points and scattered, complex geographical environment and other occasions, can be
connected with PLC, RTU, rain gauge, level meter and other data terminals.
1.2. Certifications
E90-DTU has obtained the "Radio Transmitting Equipment Type Approval Certificate" with the following approval code: CMIIT
ID: 2017FP5780.
E90-DTU has obtained the "explosion-proof certificate", its number: test word No. 201711000975.
E90-DTU has obtained the "Electrostatic Surge Test Report" issued by the Chinese Testing Institute, its number: CNEx18.1461.
E90-DTU has obtained the "Design Patent Certificate" with patent number: ZL 2016 3 0501980.3.
E90-DTU has obtained "Utility Model Patent Certificate", its patent number is: ZL 2016 2 1410691.3 .
E90-DTU has obtained "CE Certificate" (EU Compulsory Certification), its verification number is: CCISE180514601V.
The E90-DTU has obtained the "FCC Certificate" (Federal Communications Commission Certification) with the ID:
2ALPH-E90-DTU.
E90-DTU has obtained "RoHS Certificate" (EU Environmental Protection Compulsory Certification), its report number is:
DTI201807025245.
1.3. Features
1. Using the latest generation of LoRa technology, it is farther away and more powerful than traditional LoRa data transmission
stations;
2. It adopts military-grade LoRa modulation technology, with data encryption, and the subcontract length can be set;
3. Super large single packet, single packet support up to 240 bytes, adapt to Modbus protocol;
4. Simple high-efficiency power supply design, support power supply configuration or crimping mode, support 8~28V power
supply;

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5. The transmission power can reach up to 2W, and support multi-level adjustment, and all technical indicators meet European
industrial standards;
6. Support LBT function, the station automatically waits for transmission according to the current ambient noise intensity. Greatly
improve the communication success rate of the module in harsh environments;
7. Support wireless sending command packets, remote configuration or reading of wireless module parameters;
8. Support communication key function to effectively prevent data from being intercepted;
9. It can realize multi-level relay networking, effectively expand the communication distance, and realize ultra-long-distance
communication;
10. The temperature compensation circuit is adopted, and the frequency stability is better than ±1.5PPM;
11. Operating temperature range: -40°C~+85°C, adapt to a variety of harsh working environment, real industrial grade products;
12. All aluminum alloy shell, compact size, easy installation, good heat dissipation; Perfect shielding design, good electromagnetic
compatibility, strong anti-interference ability;
13. Multiple protection functions such as power reverse connection protection, over-connection protection, and antenna surge
protection greatly increase the reliability of the station;
14. Powerful software functions, all parameters can be programmed to set: such as power, frequency, air rate, address ID, etc.;
15. With a built-in watchdog and precise time layout, the module will automatically restart in the event of an exception and continue
to work according to the previous parameter settings
2、Quick start
You need to prepare
Note: When using this equipment, an external 50 ohm impedance antenna must be connected, and the two devices and antennas must
be used more than 6 meters apart, otherwise there is a risk of damage to the equipment!!
1、First install an antenna for the data transmission station, then install the power supply, and ensure that the DIP switch state is
correct, and the user can choose the crimping method or power adapter power supply according to the needs, and choose one of
the two；

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2、Use USB to RS-232, USB to RS-485 or other methods to connect the computer to the data radio station；
3、Start two serial port debugging assistants, select the serial port baud rate of 9600bps and the verification mode of 8N1 to achieve
serial port transparent transmission；

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4、If the customer needs to modify the parameters, please dial the data transmission station in the configuration mode and connect it
to the computer, download the E90-DTU SL data transmission radio configuration software on the official website of Ebaite, you
can modify the relevant parameters, and be sure to restore the DIP switch state after completing the configuration before
communication.
Mode 0 factory default state Mode 2 for parameter configuration

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3、Installation size
3.1 Description of each department
Pin
name
function
illustrate
1
DB-9 female socket
RS-232 interface
Standard RS-232 interface
2
3.81 terminal blocks
RS-485、Power
connector
Standard RS-485 interface and crimp power interface
3
PWR-LED
Power LED
Red, lit when power is turned on
4
TXD-LED
Send LED
Yellow, flashing when sending data
5
RXD-LED
Receive LED
Yellow, flashing when receiving data
6
DC power connector
Power connector
In-line round hole, outer diameter 5.5mm, inner diameter
2.5mm
7
DIP switch
DIP switch
Operating mode control
8
Antenna interface
SMA-K interface
Inner hole of external thread, length 10mm, characteristic
impedance 50Ω

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单位：mm

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4、Interface definition
4.1 Power Interface Description
Users can choose (6) DC power supply interface, using the interface to power the 5.5mm outer diameter and 2.5mm inner
diameter power adapter;
It can also be supplied to the VCC terminal and the GND terminal in (2), just choose any one of the power supply
methods;
E90-DTU can be powered by 8~28V DC power supply, 12V or 24V DC power supply is recommended.
4.2 RS232 interface definition
The E90-DTU can be connected to the device via RS-232 using a standard DB-9 interface.
4.3 RS485 interface definition
The E90-DTU can be connected to the A terminal and B terminal of RS-485 of the device using the 485_A terminal and 485_B
terminal in (2).
number
Standard
definitions
function
illustrate
1
VCC
Crimp power connector, positive
terminal
DC 8~28V, 12V or 24V is recommended
2
GND
Crimp power connector, negative
terminal
The negative terminal of the power supply is connected
to the system ground and housing
3
485_B
RS-485 interface, B interface
RS-485 interface B interface is connected to device B
interface

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4
485_A
RS-485 interface, A interface
RS-485 interface A interface is connected to device A
interface
★Note: If communication is poor when connecting the radio to multiple devices, but not with a single device, try connecting a
120Ω resistor in parallel between the 485_A terminal and the 485_B terminal.
5、Technical indicators
5.1 Model Specifications
Model
specifications
Operating
frequency
Transmit
power
Reference
distance
Specification
characteristics
Recommended application scenarios
Hz
W
km
E90-DTU(400SL33)
433.125M
2
16
LoRa spread
spectrum immunity
Suitable for long distances and easily
disturbed environments
★Note: Sunny weather, open environment unobstructed, 12V/2A power supply, 5dBi suction cup antenna, antenna 2 meters above
the ground, using factory default parameters.
5.2 General Specifications
serial
number
project
specification
illustrate
1
Product size
82*62*25 mm
See installation dimensions for details
2
Product weight
150g
Weight tolerance 4.5g
3
Operating
temperature
-40℃～+85℃
Meet the needs of industrial-grade use
4
Antenna
impedance
50Ω
Standard 50Ω characteristic impedance
5
Voltage range
8～28V DC
12V or 24V is recommended
6
Communication
interface
RS232/RS485
Standard DB9-pin/3.81 terminal blocks
7
baud rate
Factory default 9600
Baud rate range 1200~115200
8
Address code
The factory default is 0
A total of 65536 address codes can be set
5.3 Frequency range and number of channels
Model specifications
Default
Band range
Channel
Number of channels

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frequency
spacing
Hz
Hz
Hz
E90-DTU(400SL33)
433.125M
410.125～493.125M
1M
84，半双工
★Note: In the same area, multiple sets of digital radios are used for one-to-one communication at the same time. It is recommended
that each set of digital radios be set with a channel interval of more than 2MHz.
5.4 transmit power level
Model specifications
2W（33dBm）
1W（30dBm）
500mW（27dBm）
250mW
（24dBm）
E90-DTU(400SL33)
Factory default
√
√
√
★Note: The lower the transmit power, the closer the transmission distance, but the operating current will not decrease in proportion,
it is recommended to use the maximum transmit power.
5.5 Air Speed Class
Model specifications
Default air rate
Number of
levels
Air velocity rating
bps
bps
E90-DTU(400SL33)
2.4k
6
2.4、4.8、9.6、19.2、38.4、62.5k
★Note: The higher the air rate setting, the faster the transmission rate and the closer the transmission distance; therefore, if the rate
meets the requirements of use, it is recommended that the airspeed be as low as possible.
5.6 Current parameter
Model specifications
Transmit current mA
Guard current mA
12V
24V
12V
24V
E90-DTU(400SL33)
560
300
10
6
★Note: It is recommended to retain more than 50% of the current margin when selecting the power supply, which is conducive to
the long-term stable operation of the station.
5.7 Send and receive length and subpackage method
Model specifications
Cache size
Subcontracting method
E90-DTU(400SL33)
1000 字节
Subpacket 32/64/128/240 byte sending can be set via
instructions

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★Note: 1. If the single-time received data of the radio station is greater than the capacity of the single packet, the excess data will
be automatically allocated to the second transmission until the transmission is completed；
2、The data received by the station at a time cannot be greater than the cache capacity.
6、Detailed function
6.1 Fixed-point emission (hexadecimal)

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6.2 broadcast transmission (hexadecimal)
6.3 broadcast address
Example: Set the address of module A to 0xFFFF and the channel to 0x04.
When module A is used as a transmission (the same mode, transparent transmission mode), all receiving modules under the 0x04
channel can receive data to achieve the purpose of broadcasting.
6.4 listening address
Example: Set the address of module A to 0xFFFF and the channel to 0x04.
When module A is used as a reception, it can receive all the data under the 0x04 channel to achieve the purpose of monitoring.
7、Operating mode
E90-DTU has four operating modes, and it is recommended to configure the station to normal mode (mode 0) when there is no
demanding low power consumption requirement, and normal communication is required;
The station is factory set to normal mode by default (mode 0).
category
M1
M0
exegesis
Mode 0
mode
ON
ON
Serial port open, wireless open, transparent transmission (factory
default mode), support special command air configuration.
Mode 1
WOR mode
ON
OFF
It can be defined as a WOR sender and a WOR receiver,
supporting over-the-air wake-up

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Mode 2
Configuration
mode
OFF
ON
The user accesses the registers through the serial port to control
the working status of the radio, and the user can configure the
module through the host computer configuration software.
Mode 3
Deep sleep
mode
OFF
OFF
The station goes into hibernation
★Note: If there is no need for low power consumption, there is no need to care about the WOR mode (mode 1)。
7.1 General Mode (Mode 0)
type
When M0 = ON, M1 = ON, the module operates in mode 0
transmit
The user can enter data through the serial port, and the module will start wireless transmission.
reception
The wireless receiving function of the module is turned on, and after receiving wireless data, it will be output through the
TXD pin of the serial port.
7.2 WOR mode (mode 1)
type
When M0 = OFF and M1 = ON, the module operates in mode 1
transmit
When defined as a transmitter, the wake-up code is automatically incremented for a certain period of time before launching
reception
Data can be received normally, and the receiving function is equivalent to mode 0
7.3 Configuration Mode (Mode 2)
type
When M0 = ON, M1 = OFF, the module operates in mode 2
transmit
Wireless transmission is off

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reception
Wireless reception is off
disposition
The user can access registers to configure the module operating state
7.4 Deep Sleep Mode (Mode 3)
type
When M0 = OFF and M1 = OFF, the module operates in mode 3
transmit
Wireless data cannot be transmitted.
reception
Unable to receive wireless data.
note
When entering another mode from sleep mode, the module will reconfigure the parameters, and the AUX will remain low
during the configuration process；
When finished, the output is high, so it is recommended that the user detect the rising edge of the T_BUSY.
8、Register read and write control
8.1 Command format
In the configuration mode (mode 2: M1=OFF, M0=ON), the list of supported instructions is as follows (when set, only 9600, 8N1
formats are supported).：
serial
numbe
r
Instruction format
Detailed description
1
Set the registers
Instructions: C0 + start address + length + parameter
Response: C1 + start address + length + parameter
Example 1: Configure the channel to 0x09
Directive Start Address Length parameter
Send: C0 05 01 09
Return: C1 05 01 09
Example 2: Simultaneous configuration of module address (0x1234), network address (0x00), serial port
(9600 8N1), airspeed (1.2K)
Send: C0 00 04 12 34 00 61
Return: C1 00 04 12 34 00 61
2
Read registers
Instructions: C1 + start address + length
Response: C1 + start address + length + parameter
Example 1: Read the channel
Directive Start Address Length parameter
Send: C1 05 01
Return: C1 05 01 09
Example 2: Read the module address, network address, serial port, and airspeed at the same time
Send: C1 00 04
Return: C1 00 04 12 34 00 61
3
Set temporary
registers
Instructions: C2 + start address + length + parameters
Response: C1 + start address + length + parameter
Example 1: Configure the channel to 0x09

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Directive Start Address Length parameter
Send: C2 05 01 09
Return: C1 05 01 09
Example 2: Simultaneous configuration of module address (0x1234), network address (0x00), serial port
(9600 8N1), airspeed (1.2K)
Send: C2 00 04 12 34 00 61
Return: C1 00 04 12 34 00 61
5
Wireless
configuration
Instructions: CF CF + general instructions
Response: CF CF + regular response
Example 1: The wireless configuration channel is 0x09
Wireless Instruction Header Instruction Start Address Length parameter
Send: CF CF C0 05 01 09
Return: CF CF C1 05 01 09
Example 2: Wireless simultaneous configuration module address (0x1234), network address (0x00), serial
port (9600 8N1), airspeed (1.2K)
Send: CF CF C0 00 04 12 34 00 61
Return: CF CF C1 00 04 12 34 00 61
6
Format error
Format error response
FF FF FF
8.2 Register description
serial
number
Read and
write
name
description
remark
00H
Read/Write
ADDH
ADDH（default0）
Module address high byte and low byte;
Note: When the module address is equal to FFFF,
it can be used as a broadcast and listening address,
that is, the module will not perform address
filtering
01H
Read/Write
ADDL
ADDL（default0）
02H
Read/Write
NETID
NETID（default0）
network address, which is used to distinguish the
network;
When communicating with each other, it should
be set to the same.
03H
Read/Write
REG0
7
6
5
UART baud rate（bps）
The two modules that communicate with each
other, the serial port baud rate can be different,
and the verification method can also be different;
When transmitting large packets continuously,
users need to consider data blocking caused by the
same baud rate, and may even lose it.
It is generally recommended that the baud rate be
the same on both sides of the communication.
0
0
0
baud rate is 1200
0
0
1
baud rate is 2400
0
1
0
baud rate is 4800
0
1
1
baud rate is 9600（default）
1
0
0
baud rate is 19200
1
0
1
baud rate is 38400
1
1
0
baud rate is 57600
1
1
1
baud rate is 115200
4
3
Serial check bit
The serial port mode of the communication two
sides can be different;
0
0
8N1（default）
0
1
8O1
1
0
8E1
1
1
8N1（equate 00）
2
1
0
Air speed（bps）
The air speed on both sides of the communication

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must be the same;
The higher the air rate, the smaller the delay and
the shorter the transmission distance.
0
1
0
Air speed 2.4k（default）
0
1
1
Air speed 4.8k
1
0
0
Air speed 9.6k
1
0
1
Air speed 19.2k
1
1
0
Air speed 38.4k
1
1
1
Air speed 62.5k
04H
Read/Write
REG1
7
6
subcontract settings
The data sent by the user is less than the length of
the packet, and the output of the serial port at the
receiving end is presented as uninterrupted
continuous output；
If the data sent by the user is larger than the length
of the packet, the serial port at the receiving end
will output the packet.
0
0
240 bytes（default）
0
1
128 bytes
1
0
64 bytes
1
1
32 bytes
5
RSSI Ambient noise enable
After enabling, the command C0 C1 C2 C3 can be
sent in the transmission mode or WOR
transmission mode to read the register;
Register 0x00: current ambient noise RSSI;
Register 0X01: RSSI at Last Data Received
(The current channel noise is: dBm =-RSSI/2);
Instruction format: C0 C1 C2 C3 + start address +
read length;
Return: C1 + address address + read length + read
effective value; such as: send C0 C1 C2 C3 00 01
return C1 00 01 RSSI
0
disabled（default）
1
enabled
4
3
2
reserve
1
0
transmit power
Transmission power Power and current have a
nonlinear relationship, and the power supply
efficiency is the highest at maximum power;
Current does not decrease proportionally with
power reduction.
0
0
2W（33dBm，default）
0
1
1W（30dBm）
1
0
500mW（27dBm）
1
1
250mW（24dBm）
05H
Read/Write
REG2
channel control（CH）
0-83 represent a total of 84 channels
actual frequency = 410.125 + CH * 1M
06H
Read/Write
REG3
7
enable rssi byte
When enabled, the module receives wireless data
and outputs it through the serial port TXD,
followed by an RSSI strength byte.
0
disabled（default）
1
enabled
6
transfer method
During fixed-point transmission, the module will
recognize the first three bytes of serial port data
as: address high + address low + channel, and use
it as the wireless transmission target.
0
transparent transmission (default)
1
Fixed-point transmission
5
relay function
After the relay function is enabled, if the target
address is not the module itself, the module will
start a forwarding;
In order to prevent data return, it is recommended
to use it in conjunction with the fixed-point mode;
that is, the destination address is different from
the source address.
0
Disable relay function (default)
1
Enable relay function
4
LBT enable
After enabled, wireless data will be monitored
before transmission, which can avoid interference
to a certain extent, but may cause data delay;
The maximum stay time of LBT is 2 seconds, and
it will be issued forcibly when it reaches 2
seconds.
0
disabled (default)
1
enable

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3
WOR mode transceiver control
Only valid for mode 1;
After the WOR receiver receives the wireless data
and outputs it through the serial port, it will wait
for 1000ms before entering WOR again. During
this period, the user can input the serial data and
return it through the wireless;
Each serial port byte will be refreshed for
1000ms;
The user must initiate the first byte within
1000ms.
0
WOR receiver (default)
The transceiver of the module is turned on, and
when transmitting data, a wake-up code for a
certain period of time is added.
1
WOR transmitter
The module cannot transmit data and works in
WOR monitoring mode. The monitoring cycle
is shown below (WOR cycle), which can save a
lot of power consumption.
2
1
0
WOR cycle
Only valid for mode 1;
Period T= (1+WOR)*500ms, maximum 4000ms,
minimum 500ms;
The longer the WOR monitoring interval period,
the lower the average power consumption, but the
greater the data delay;
The sending and receiving parties must be
consistent (very important)
0
0
0
500ms
0
0
1
1000ms
0
1
0
1500ms
0
1
1
2000ms（default）
1
0
0
2500ms
1
0
1
3000ms
1
1
0
3500ms
1
1
1
4000ms
07H
Write
CRYPT_H
key high byte (default 0)
Write only, read returns 0;
Used for encryption to avoid interception of air
wireless data by similar modules;
Inside the module, these two bytes will be used as
calculation factors to transform and encrypt the
wireless signal in the air.
08H
Write
CRYPT_L
Key low byte (default 0)
80H～86H
Read
PID
Product information 7 bytes
Product information 7 bytes
8.3 Factory Default Parameters
Module model
frequency
address
Channel
Air speed
Baud rate
Serial
format
transmit power
E90-DTU
(400SL33)
433.125MHz
0x0000
0x23
2.4kbps
9600
8N1
2W（33dBm，
default）
9、Use of relay networking mode
No.
Description of relay mode
1
After setting the relay mode through the configuration mode, switch to the general mode and the relay starts to work.
2
In relay mode, ADDH and ADDL are no longer used as module addresses, but are forwarded and paired corresponding to
NETID respectively. If one of the networks is received, it will be forwarded to another network. The repeater's own
network ID is invalid.