Ebyte E32-DTU User manual

E32-DTU (433L20)

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co,;Ltd 1
Content
1.Introduction..................................................................................................................................................................2
1.1.Brief Introduction............................................................................................................................................. 2
1.2.Features.............................................................................................................................................................2
2. Operation.....................................................................................................................................................................3
3. Installation Specifications...........................................................................................................................................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.General specification parameters..................................................................................................................... 9
5.3.Frequency range and channels........................................................................................................................10
5.4.Transmit power level...................................................................................................................................... 10
5.5.Air data rate.................................................................................................................................................... 10
5.6.Current parameters..........................................................................................................................................10
5.7.Transceiver Length and Sub-packing Mode...................................................................................................11
6. Operating mode.........................................................................................................................................................11
7. Connection diagram when programming................................................................................................................. 12
7.1.diagrammatic drawing.................................................................................................................................... 12
7.2.Parameter setting instruction.......................................................................................................................... 13
8. Connection diagram in test and application............................................................................................................. 14
9. E32-DTU series........................................................................................................................................................ 14
10.Practical application.................................................................................................................................................15
11.Note..........................................................................................................................................................................15
12.Important statement................................................................................................................................................. 16

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co,;Ltd 2
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.
1.Introduction
1.1. Brief Introduction
E32-DTU (433L20) is a wireless data transceiver of 433M with standard RS232/RS485 connectors. They are
half-duplex. TX & RX modems with LoRa technology and transparent transmission mode. Voltage supply ranges from
8V to 28V, Working frequency: 425~450.5MHz (Default:433MHz).
The LoRa direct sequence spread spectrum technology enables the longer communication distance and better power
density concentration as well as superior anti-interference ability. The FEC algorism enables higher coding efficiency and
correction ability. The interfered data packets will be corrected proactively upon sudden interference, which significantly
improves reliability and communication distance. Without FEC, the interfered data packet will be dropped. The
transceivers feature data encryption and compression. The data transmitted in air features randomness, the rigorous
algorism makes data interception meaningless. The data compression function has possibility to reduce the data
transmission time, which in turn reduces the possibility of being interfered, thus improves the reliability and
communication efficiency.
1.2. Features
★All core components are originally imported, our transceiver modems have much advanced functions with smaller size
and lower cost.
★The top TX power is 100mW, all technical parameters meet 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.
★Aluminum alloy case, compact size, great heat dispersion; good shielding, prime electromagnetic compatibility and
strong anti-interference.
★Power reverse & overload protection and antenna surge protection functions significantly improve the reliability.
★Parameters can be configured by programming, such as TX power, frequency point, air data rate, address and so on.
★Ultra-low power consumption, standby current is only 28mA (even lower under power-saving and sleep modes), TX
current ≤0.2A .
★Embedded watch-dog and precise time layout, modem will restart automatically upon abnormal situation and work
with previous parameters.
★The transceivers adopt original SEMTECH SX1278 chip, customers highly comment the products because of the
super reliability.

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co,;Ltd 3
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.
2、Using USB-(RS232) converter or USB-RS(485) converter or other way to link computer and DTU.

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co,;Ltd 4
3、Firing up two XCOMs, choosing Baud rate 9600bps, 8N1, the setting which serial port transmission can be
achieved.
4、User needs to open the mode switch first before link DTU with computer if the user want to modify parameters.
Firing up E32-DTU 数 传 电 台 配 置 软 件 (E32-DTU parameter configuration application) to modify related
parameters. The mode switch must be reopened to achieve transmission after the configuration.
Mode 0 Default Mode 3 Parameter setting

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co,;Ltd 5
3.Installation Specifications
3.1. Structure

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
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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, power interface
Standard RS-485 interface and pressure line
power interface
3
PWR-LED
Power LED
Red, lit when the power is on
4
TXD-LED
Transmit LED
Yellow, blinks when sending data
5
RXD-LED
Receive LED
Yellow, blinks when receiving data
6
DC power interface
Power interface
In-line round hole, outer diameter 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

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co,;Ltd 7
3.2. Dimension
Unit：mm

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co,;Ltd 8
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 the VCC and GND terminal power supply, only choose any one of the power supply is OK;
E32-DTU can use 8~ 28V DC power supply, but it is recommended to use 12V or 24V DC power supply.
4.2. RS232 Interface definition
The E32-DTU can be connected to the device via RS-232 using the standard DB-9 interface.
4.3. RS485 Interface definition
E32-DTU can connect the 485_A terminal and 485_B terminal with the device RS-485 A terminal and B terminal.
★
Pin NO.
Definition
Function
Description
1
VCC
Crimping power interface, positive
8 ~ 28V DC, recommended 12V or 24V
2
GND
Crimping power interface, negative
The power supply negative pole 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

Chengdu Ebyte Electronic Technology Co.,Ltd. E32-DTU (433L20) user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co,;Ltd 9
4
485_A
RS-485 interface, interface A
The RS-485 interface A is connected to the device
interface A
★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
E32-DTU
(433L20)
433
0.1
3
Strong penetration，
anti - interference
To the environment with small data,
long distance, many obstacles
★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.
5.2. General specification parameters
NO.
Model
Specification
Description
1
Size（H*W*D）
82 * 62 * 25 mm
See more at 3.2 Dimension
2
Weight
131g
Tolerance: 4.5g
3
Temperature
-40℃～+70℃
Meet industrial level
4
Antenna impedance
50 Ω
Standard 50 Ω characteristic impedance
5
Supply voltage
+8 ~ +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