Ebyte E90-DTU User manual

E90-DTU (433C37)

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433C37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 1
Content
1. Introduction .......................................................................................................................................2
1.1. Brief Introduction.................................................................................................................2
1.2. Certificate............................................................................................................................2
1.3. Features...............................................................................................................................3
2. Operation...........................................................................................................................................3
3. Installation Specification......................................................................................................................5
3.1. Structure..............................................................................................................................5
3.2. Dimension ...........................................................................................................................7
4. Interface Defination ............................................................................................................................8
4.1. Power interface definition ......................................................................................................8
4.2. RS232 Interface definition .....................................................................................................8
4.3. RS485 Interface definition .....................................................................................................8
5. Technical indicators ............................................................................................................................9
5.1. Model specifications .............................................................................................................9
5.2. Frequency range and channels ................................................................................................9
5.3. Air data rate....................................................................................................................... 10
5.4. Current parameters.............................................................................................................. 10
5.5. Transceiver Length and Sub-packing Mode............................................................................ 10
6. Operating Mode................................................................................................................................ 10
7. Connection diagram when programming...............................................................................................11
7.1. Diagrammatic drawing.........................................................................................................11
7.2. Parameter setting instruction ................................................................................................ 12
8. Connection diagram in test and application .......................................................................................... 14
9. E90 Series........................................................................................................................................ 14
10. Practical application................................................................................................................... 15
11.Note................................................................................................................................................... 15
12.Important statement............................................................................................................................. 16
Revision history....................................................................................................................................... 17
About us................................................................................................................................................ 17

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433C37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 2
1. Introduction
1.1. Brief Introduction
E90-DTU (433C37) is a data transmission station that adopts extremely advanced ultra-narrow band modulation technology. On
the original basis, power amplifier (PA) and low noise amplifier (LNA) are built in, so that the maximum transmitting power reaches
5w and the receiving sensitivity is also improved to a certain extent. Compared with the products without power amplifier and low
noise amplifier, the overall communication stability isgreatly improved.
Different from the traditional data transmission station, E90-DTU (433C37) is specially developed for Modbus application
scenarios. The feature of unlimited packet length can replace the communication cable, making it the most convenient choice for
Modbus wireless upgrade. The station works in 433MHz frequency band, with communication distance up to 10km. Wireless digital
radio as a medium of communication, as well as optical fiber, microwave, open wire, there is a certain scope of application: it provides
some special conditions, private network monitoring signals in real-time and reliable data transmission, low cost, easy installation and
maintenance, diffraction capability is strong, flexible network structure, the coverage is far characteristic, suitable for some more and
occasions, such as dispersion and complex geographical environment with PLC, RTU, rain gauge, level gauge and other data terminal
is connected.
1.2. Certificate
E90-dtu has obtained the "radio transmission equipment model approval certificate", whose approval code is：
CMIIT ID:2017FP5780。
E90-DTU has obtained the "explosion-proof certificate", whose number is: test no.201711000975
E90-dtu has obtained the "electrostatic surge detection report" issued by China testing institute, whose number is
CNEx18.1461.
E90-dtu has obtained the "appearance design patent certificate", and its patent number is ZL 2016 3 0501980.3.
E90-DTU has obtained the "utility model patent certificate", and its patent number is ZL 2016 2 1410691.3.
E90-dtu has obtained the "CE certificate" (mandatory eu certification), whose verification number is
CCISE180514601V.
E90-DTU has obtained an "FCC certificate" with the ID of 2ALPH-E90-DTU.
E90-DTU has obtained the "RoHS certificate" (mandatory EU environmental protection certification), and its report
number is DTI201807025245.

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1.3. Features
★All the core components of the original import, compared with the current similar imported digital radio, the most
advanced function, the smallest size, the best price.
★Infinite packet length, support uninterrupted transmission, Modbus adaptation.
★Tailored for Modbus,all direct replacement of RS-485 cable.
★Simple and efficient power supply design, support power supply device or line pressure mode, support 10~28V
power supply.
★Transmission power up to 5w, and multi-level adjustable, all technical indicators up to the European industrial
standards.
★Temperature compensators are adopted to make the frequency stability better than ±1.5PPM.
★Operation temperature range: -40℃～+85℃, applicable for various harsh environment, it is real industrial grade
products
★All aluminum alloy shell, compact size, easy installation, good heat dissipation; Perfect shielding design, good
electromagnetic compatibility, strong anti - interference ability.
★Power reverse connection protection, over-connection protection, antenna surge protection and other multiple
protection functions, greatly increasing the reliability of the station.
★Powerful software functions, all parameters can be set through programming: such as power, frequency, air speed,
address ID, etc
★Ultra-low power consumption, the standby current is only 47mA (power saving mode and sleep mode power
consumption is lower), the emission current 1.0A.
★Built-in watchdog, and accurate time layout, once an exception, the module will automatically restart, and can
continue to work in accordance with theprevious parameter Settings.
2. Operation
Main parts
1、First step is to mount antenna, then battery, making sure the dial switch is on its right status. User gets on the power
by choosing either VCC/GND or power adapter.

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2、Using USB-(RS232) converter or USB-RS(485) converter or other way to link computer and DTU.
3、Firing up two XCOMs, choosing Baud rate 9600bps, 8N1, the setting which serial port transmission can be
achieved.

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4、User needs to open the mode switch first before link DTU with computer if the user wants to modify parameters.
Firing up E90-DTU 数 传电 台 配置 软件 (E90-DTU parameter configuration application) to modify related
parameters. The mode switch must be reopened to achieve transmission after the configuration.
模式 0 出厂默认状态 模式 2 进行参数配置
3. Installation Specification
3.1. Structure

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Pin NO.
Name
Function
Description
1
DB-9 female socket
RS-232 interface
Standard RS-232 interface
2
3.81 terminal block
RS-485, powerinterface
Standard RS-485 interface and pressureline
powerinterface
3
PWR-LED
Power LED
Red, lit when the poweris on
4
TXD-LED
Transmit LED
Yellow, blinks when sending data
5
RXD-LED
Receive LED
Yellow, blinks when receiving data
6
DC powerinterface
Power interface
In-line round hole, outerdiameter 5.5mm,
diameter 2.5mm
7
DIP switch
DIP switch
Controlled by working mode
8
Antenna interface
SMA-K interface
external thread, 10mm, 50Ωcharacteristic
impedance

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3.2. Dimension
单位：mm

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4. Interface Defination
4.1. Power interface definition
Users can choose ⑥DC power interface, using the power adapter supply with the interface of the 5.5mm outer
diameter , 2.5mm diameter ;
Also choose theVCC and GND terminal power supply, only choose any oneof the power supply is OK;
E90-DTU can use10~ 28V DC power supply, but it is recommended to use 12V or 24V DC power supply.
4.2. RS232 Interface definition
The E90-DTU can be connected to the device via RS-232 using the standard DB-9 interface.
4.3. RS485 Interface definition
E90-DTU can connectthe485_A terminal and 485_B terminal with the device RS-485 A terminal and B terminal.
Pin NO.
Definition
Function
Description
1
VCC
Crimping powerinterface, positive
10 ~ 28V DC, recommended 12V or 24V
2
GND
Crimping powerinterface, negative
The powersupply negativepole is connected to the system
ground and the housing
3
485_B
RS-485 interface, interface B
The RS-485 interface B is connected to the device interface B
4
485_A
RS-485 interface, interface A
The RS-485 interface A is connected to thedevice interface A

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★Note: The transceiver will be in poor communication when connected to multiple devices , it is recommended to be
connected to a single device, please try to use parallel 120Ω resistor between 485_A terminal and 485_B.
5. Technical indicators
5.1. Model specifications
Model
Frequency
Transmit
power
Distance
Specifications
Application
Hz
W
km
E90-DTU (433C37)
433M
5
10
Continuous
transmission,
support Modbus
Suitable for large data volume
applications, support Modbus
★Note: Test condition: in clear and open air without shelters, 12V /2A power supply, 5dBi gain sucker antenna over 2
meters height from the ground, with the factory default parameters.
NO.
Model
Specification
Description
1
Size（H*W*D）
124 * 105 * 25 mm
See more at 3.2 Dimension
2
Weight
240g
Tolerance: 9g
3
Temperature
-40℃～85℃
Meet industrial level
4
Antenna impedance
50 Ω
Standard 50 Ω characteristic impedance
5
Supply voltage
+10 ~ +28V DC
It is recommended to use 12V or 24V
6
Communication interface
RS232/RS485
Standard DB9 hole / 3.81 terminal block
7
Baud rate
Default 9600
from 1200 to 115200 bps
8
Address
Default 0
65536 configurable addresses
5.2. Frequency range and channels
Model
Default frequency
Frequency range
Channel
spacing
Channels
Hz
Hz
Hz
E90-DTU (433C37)
433M
425~450.5M
100K
256，half duplex
★Note: In the same area when multiple data transceivers are communicating one to one at the same time, it is
recommended to set thechannel spacing between each group of datatransceivers at 2MHz or more.

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5.3. Air data rate
Model
Default air data
rate
Levels
Air data rate(bps)
bps
bps
E90-DTU(433C37)
N/A
N/A
Unadjustable, the air speedwill automatically
adjust to the baud rate
★Note: The higher the air data rate, the faster the transmission rate, the transmission distance is also closer; when the
rate meets the requirements, thelower air data rate, thebetter quality.
5.4. Current parameters
Model
Transmitting current mA
Standby current mA
12V
24V
12V
24V
E90-DTU (433C37)
1027
507
47
25
★Note: It is recommended to retain more than 50% of the current margin when selecting the power supply, which will
help the data transceiver to work steadily for a long time.
5.5. Transceiver Length and Sub-packing Mode
Model
Buffer
Sub-package
E90-DTU (433C37)
Single input unlimited (baud
rate ≤57600)
Continuous transmission, no subcontracting
★Note:
1. If the data received by the station in a single time is larger than the capacity of a single packet, the excess data
will be automatically allocated to the second transmission until the completion of transmission.
2. The data transceiver cannot receive datawhich is more than the buffer capacity;
6. Operating Mode
E90-DTU(230C27) has four operating modes, if low power consumption is not required, normal communication is recommended to
configure the data transceiver for the normal mode (mode 0);
The factory default is normal mode (mode 0).
Categories
M1
M0
Description
Mode0
Normal Mode
ON
ON
Serial port open,wireless open,transparent transmission(factory
default mode)

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Mode1
Retained mode
ON
OFF
Nonsense, both serial and wireless are disabled
Mode2
Command mode
OFF
ON
The radio can be programmed using configuration software
Mode3
Sleep Mode
OFF
OFF
The module entershibernation, and the serial port and module are
closed
★Note: no need to care about the wake-up mode (mode 1) and power saving mode (mode 2) if it doesn’t request low
power consumption.
7. Connection diagram when programming
7.1. Diagrammatic drawing

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Mode
M1
M0
Description
Mode3
Command mode
Off
Off
Only be programmed using the
configuration softwarein the current mode
★Note:
1.programming can only be carried on in a specific mode (see above), if fails, please confirm the work mode.
2.If there’s no complicated programming, opening the E90-DTU数传电台配置软件 (E90-DTU parameter configuration
application) to modify parameters.
7.2. Parameter setting instruction

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Parameter
Description
Baud rate
The serial port baudrate of a wireless data stationat work，1200bps～115200bps。
Odd-even check
Support 8N1:nocheck ；8E1:even-check；8O1:odd-check；Both are 8-bit data bits and 1-bit stop
bits.
Air data rate（bps）
Wireless communication rate, also known as air baud rate air rate high, data transmissionspeed,
transmission of thesame data time delay is small, but thetransmission distance will become shorter.
Transmittingpower
In order to ensure the working efficiency, it is recommended to use themaximum power.If the
transmittedpoweris reduced, the communication distance will become shorterand the required
current will be reduced
FEC
The lost or interfered data can be partially corrected by complex encoding, which can improve the
equivalent receiving sensitivity by about 3dBm. Turning off this function can reduce the
communication delay.
Transmission mode
Fixed length transmission: automatic subcontractingin traditional wireless transmission mode, with
a maximum of 77 bytesperpacket.
Continuous transmission: unlimited packet length, supportingwireless continuous transmission.
Wake Up Time
There is no direct relationship withthe communication delay. If thecustomer needs low-power
applications,this optionshall be adjusted as required. In the power-savingmode, thelonger the
wake-up time, thelower thepowerconsumptionof the receiving end, and the greater the
communication delay.
Station Address
Internal address of wireless data station,stationswiththesame address as thoseindependent of
Modbus address can communicate with each other. This feature can be used to realize software
filtering grouping input range :0~65535, decimal number.
Frequency Channel
It is equivalent to theworking frequency of the wireless data transmission station.Each channel
corresponds to its different working frequency. Theoretically, different frequency channels cannot
communicate with each other，If there are multiple groups of wireless data stations in the same area,
the communication frequency interval is suggested to be 2~5MHz.
Cipher
function
Only stationswiththe same ciphertext can communicate, and the secondary ciphertext can only be
writtenbut cannot be read.
Cipher text set
Radio ciphertext, input range :0 ~ 65535, decimal number.

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8. Connection diagram in testand application
9. E90 Series
Mode No.
Interface
Frequency
Hz
Tx power
dBm
Distance
km
Function feature
E90-DTU(170L30)
RS232 RS485
170M
30
8
LoRa spread spectrum,ultra-strong through
diffraction
E90-DTU(433L30)
RS232 RS485
433M
30
8
LoRa spread spectrum,long distance, anti -
interference
E90-DTU(433L37)
RS232 RS485
433M
37
20
LoRa spread spectrum,20km long distance,
anti - interference
E90-DTU(433C30)
RS232 RS485
433M
30
3
High-speed continuous transmission, support
ModBus protocol
E90-DTU(433C33)
RS232 RS485
433M
33
4
High-speed continuous transmission, support
ModBus protocol
E90-DTU(433C37)
RS232 RS485
433M
37
10
High-speed continuous transmission, support
ModBus protocol, long distance
E90-DTU(230N27)
RS232 RS485
230M
27
5
Low frequency narrow band, suitable for
complex environment
E90-DTU(230N33)
RS232 RS485
230M
33
8
Low frequency narrow band, suitable for
complex environment
E90-DTU(230N37)
RS232 RS485
230M
37
15
Low frequency narrow band, suitable for
complex environment, superdiffraction

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10. Practicalapplication
The data transceiver of CDEBYTE is applied for all kinds of point to point, one point to multiple points wireless
data transmission system, such as smart home, Internet of things transformation, power load monitoring, distribution
network automation, hydrological and hydrological forecasting, water pipe network monitoring, urban street lamps
Monitoring, air defense alarm control, railway signal monitoring, centralized control of railway water supply, oil supply
pipe network monitoring, GPS system, remote meter reading, electronic crane, automatic reporting, seismic forecasting,
fire prevention, environmental monitoring and other industrial automation system, as shown below:
11.Note
1. Please keep the warranty card of the equipment which includes the factory number (and important technical
parameters) and is important for user's future maintenance and new equipment.
2. Transceiver during the warranty period, if the quality of the product itself rather than man-made damage or
lightning and other natural disasters caused by damage, enjoys free warranty; please do not repair by yourself, the
problem and please contactwith our company when problem occurring, we offer the first-class after-sales service.
3. Please do not operate the transceiver in some flammable places such as coal mines or near explosive atmospheres
(such as detonators).
4. Please use the appropriate DC power supply, high frequency interference ability, small ripple, and enough load
capacity are required; it’s better to have over current, over vo ltage protection and lightning protection and other funct ions
to ensure that transceiver working properly.

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5. Please do not use it in the working environment beyond the transceiver environmental characteristics , such as
high temperature, humidity, low temperature, strong electromagnetic fields or dust larger environment.
6. Please do not continuously keep transceiver to transmit in full capacity, or the transmitter might be damaged.
7. Please connect the ground with the external ground of the power supply (such as PC, PLC, etc.) , otherwise it is
easy to burn out the communication interface; do not plug the interface with power supplying.
8. When testing, please connect the antenna or 50 Ω load, otherwise transceiver will be damaged easily ;the distance
from the antenna is better than 2 meters, so as to avoid harm, please do not touch the antenna when transmitting.
9. Wireless data transceiver has different communication distance in different environments , communication
distance is influenced by temperature, humidity, obstacle density, obstacle volume and electromagnetic environment; in
order to ensurestable communication, it is recommended to reserve at least 50 % of the communication distance.
10. When communication distance is not perfect, it is recommended to improve the antenna quality and the
installation mode of the antenna. You can send mail to [e-mail] support.
11. When choosing power supply, it is recommended to keep at least 50% current left and the ripple must not exceed
100mV.
12.Important statement
1. CDEBYTE reserves the right of final interpretation and modification of all the contents ofthis manual.
2. As the hardware and software products continuously improving, this manual may subject to change without notice,
please refer to the latest version.

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Revision history
version
Date
Description
Issued by
1.20
2019-04-12
initial version
Molly
About us
Technical support:[e-mail]
Documents and RF Setting download link: www.ebyte.com
Thank you for using Ebyteproducts! Please contact us with any questionsor suggestions: [e-mail]
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