Ebyte E90-DTU Operator's manual

EBYTE Wireless Data Transceiver
E90-DTU
User Instruction Manual
This manual may change with the continuous improvement of the product. Please refer to the latest version of the instruction.
Chengdu Ebyte Electronic Technology Co., Ltd. reserves all rights of final interpretation and modification of this manual.

1.Introduction
1.1 Brief introduction
E90-DTU is a wireless data transceiver with the function of digital data processing, digital modulation and
demodulation, FEC, balanced soft decision, etc.. Wireless data transceiver provides transparent RS232 / RS485 interface,
different with the analog FM transceiver plus MODEM analog digital transceiver.
Wireless data transceiver working as a communication medium,as well as the fiber, microwave, the same line, has a
certain scope of application: it provides some special conditions in the private network monitoring signal real-time, reliable
data transmission,with the features of low cost, convenient installation and maintenance , diffraction ability, flexible
network structure, range of coverage,suitable for the occasion of dot and scatter ，complex geographical environment ,
connecting with PLC, RTU, rain gauge, level gauge and other data terminals.
1.2 Certificate
E90-DTU has been issued the "Wireless Transmission Equipment Model Approval Certificate"by the Ministry of
Information Industry of China , the approval code: CMIIT ID: 2017FP5780.
E90-DTU has been issued the "Design Patent Certificate" by the State Intellectual Property Office of China, the patent
number: ZL 2016 3 0501980.3.
E90-DTU has been issued the"Utility Model Patent Certificate"by the State Intellectual Property Office of China, the
patent number: ZL 2016 2 1410691.3.

1.3 Features
All the core components are imported originally , compared with the current imports of digital transceiver , we are
the most advanced, most cost effective and the smallest one.
Transmission power is optional：0.5 ~ 5W, all technical indicators have met the European industry standards.
Use temperature compensation circuit, the frequency stability is better than ±1.5PPM.
With operating temperature range: -40 ℃~ +70 ℃, adapting to a variety of harsh working environment.
All with aluminum alloy shell, compact, easy installation, good heat dissipation; perfect shielding design, good
electromagnetic compatibility and strong anti-interference ability.
Power reverse protection, over-protection, antenna surge protection and other multiple protection functions,
greatly increase the reliability of the transceiver.
Powerful software features, all parameters can be programmed to set: such as power, frequency, air data rate,
address ID, etc.
Ultra-low power consumption, standby current is 50mA (the power consumption of power saving mode and sleep
mode is lower), the transmitting current ≤1.2A (5W).
With watchdog and accurate time layout, in the event of an exception, the module will automatically restart and
continue to follow the previous parameters to operate.

2.Dimension
2.1 Pin description
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 sending 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, 50Ω
characteristic impedance

2.2 Type A dimension（L433-37, N230-37, C433-37）
★Note: Type A is the 5W power specification model, including the following models:L433-37, N230-37, C433-37

2.3 Type B dimension（L433-30, L170-30, N230-27, N230-33, C433-30）
★Note: Type B is below 2W power specifications models, including the following models: L433-30, L170-30, N230-27,
N230-33, C433-30

3.Interface definition
3.1 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;
E90-DTU can use 10 ~ 28V DC power supply, but it is recommended to use 12V or 24V DC power supply.
3.2.RS232 interface definition
The E90-DTU can be connected to the device via RS-232 using the standard DB-9 interface.
3.3.RS485 interface definition
E90-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
Pressure line power interface, positive
10 ~ 28V DC, recommended 12V or 24V
2
GND
Pressure line 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
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 poor communication when connecting multiple devices , while connecting a single device
is not, please try to parallel connect 120Ωresistor between 485_A terminal and 485_B.

4.Technical indicators
4.1 Model specifications
Series
Model
Frequency
（HZ）
Transmit
power(W)
Distance
（Km）
Specifications
Application
L
L433-30
433M
1
8
LoRa spread spectrum,
anti - interference
To the environment with
small data, far distance
L433-37
433M
5
20
LoRa spread spectrum,
anti - interference
To the environment with
small data, far distance
L170-30
170M
1
8
LoRa spread spectrum,
anti - interference
To the environment with
small data, many obstacles
N
N230-27
230M
0.5
5
Super diffraction
capability
To the complex environment
with many obstacles
N230-33
230M
2
8
Super diffraction
capability
To the complex environment
with many obstacles
N230-37
230M
5
15
Super diffraction
capability
To the complex environment
with many obstacles
C
C433-30
433M
1
3
High speed continuous
transmission
To the environment large
data supporting Modbus
C433-37
433M
5
10
High speed continuous
transmission
To the environment large
data supporting 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.
4.2 General specification parameters
NO.
Model
Specification
Description
1
Size（H*W*D）
82 * 62 * 25 mm
L433-30/L170-30/N230-27/N230-33/C433-30
124 * 105 * 25 mm
L433-37/N230-37/C433-37
2
Weight
130g
L433-30/L170-30/N230-27/N230-33/C433-30
240g
L433-37/N230-37/C433-37
3
Temperature
-40℃～+70℃
-
4
Antenna impedance
50 Ω
Standard 50 Ωcharacteristic 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

4.3 Frequency range and channels
Series
Model
Default frequency
（HZ）
Frequency range（HZ）
Channel spacing（HZ）
Channels
L
L433-30
433M
410~441M
1M
32,half duplex
L433-37
433M
410~441M
1M
32,half duplex
L170-30
170M
160~173.5M
250K
55,half duplex
N
N230-27
230M
225~237.6M
200K
64,half duplex
N230-33
230M
225~237.6M
200K
64,half duplex
N230-37
230M
225~237.6M
200K
64,half duplex
C
C433-30
433M
425~450.5M
100K
256,half duplex
C433-37
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 the channel spacing between each group of data transceivers at 2MHz or more.
4.4 Transmit power level
Series
Model
5W
2W
1W
500mW
250mW
125mW
64mW
L
L433-30
√
Default
√
√
√
L433-37
√
Default
L170-30
√
Default
√
√
√
N
N230-27
√
Default
√
√
√
N230-33
√
Default
√
√
√
N230-37
√
Default
C
C433-30
√
Default
√
√
√
C433-37
√
Default
★Note: The lower the transmit power, the closer the transmission distance, but the working current won’t be declined in
exact proportion , it is recommended to use the maximum transmit power.

4.5 Air data rate
Series
Model
Default air data rate
(bps)
Levels
Air data rate(bps)
L
L433-30
2.4k
6
0.3，1.2，2.4，4.8，9.6，19.2k
L433-37
2.4k
6
0.3，1.2，2.4，4.8，9.6，19.2k
L170-30
2.4k
6
0.3，0.6，1.2，2.4，4.8，9.6k
N
N230-27
1.2k
8
1.2，2.4，4.8，9.6，19.2，38.4，50，70k
N230-33
1.2k
8
1.2，2.4，4.8，9.6，19.2，38.4，50，70k
N230-37
1.2k
8
1.2，2.4，4.8，9.6，19.2，38.4，50，70k
C
C433-30
N/A
N/A
Not adjustable, automatically adapt to the baud
rate
C433-37
N/A
N/A
Not adjustable, automatically adapt 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 , the lower air data rate, the better quality .
4.6 Current parameters
Series
Model
Transmitting current（mA）
Standby current（mA）
12V
24V
12V
24V
L
L433-30
367
182
21
12
L433-37
1138
558
50
27
L170-30
293
146
22
13
N
N230-27
163
84
17
10
N230-33
806
396
19
11
N230-37
1037
506
41
22
C
C433-30
308
154
23
13
C433-37
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.