Ebyte E92-DTU User manual

E92-DTU(2G4HD12)

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 1
Contents
Disclaimer............................................................................................................................................................. 2
1 Overview............................................................................................................................................................3
1.1 Brief Introduction........................................................................................................................................3
1.2 Features....................................................................................................................................................... 3
2 Quick Start......................................................................................................................................................... 4
User needs to prepare below parts:................................................................................................................... 4
3 Size.....................................................................................................................................................................6
4 Parameters..........................................................................................................................................................7
4.1 Model details...............................................................................................................................................7
4.2 Regular parameters......................................................................................................................................7
4.3 Frequency range and Channels................................................................................................................... 7
4.4 Electronic parameters..................................................................................................................................8
4.5 Default parameters...................................................................................................................................... 8
5 Detailed function................................................................................................................................................8
5.1 Point-to-point communication mechanism................................................................................................. 8
5.2 Full duplex/high-speed continuous transmission........................................................................................8
6 Similar products................................................................................................................................................. 9
7 User Notes and Safety Notice............................................................................................................................ 9
Copyrights Notice............................................................................................................................................... 10
Revision history.................................................................................................................................................. 10
About us..............................................................................................................................................................10

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 2
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. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 3
1 Overview
1.1 Brief Introduction
E92-DTU (2G4HD12) is a high-quality wireless bridge for RS485 with IP67 protection capability, which can be
applied to industrial occasions with complex electromagnetic environment and a variety of outdoor environments. This
bridge has the characteristics of low delay, full duplex, automatic frequency hopping, high-speed continuous transmission,
etc. Its strong anti-interference ability makes wireless communication more stable and reliable.
E92-DTU (2G4HD12) is a point-to-point, frequency hopping, continuous transmission, duplex wireless RS485
bridge, working in the free 2.4G frequency band around the world. The transmission power of the bridge is 12dBm,
supports transparent transmission, provides RS485 interface, and supports 8~28 V voltage input. Wireless transceiver has
CRC check, FEC (forward error correction), packet loss retransmission and other technologies, plus automatic frequency
hopping technology, so even in the case of sudden interference, it is almost unaffected, greatly improving the reliability
of wireless transmission And transmission distance. The radio has a two-way continuous transmission function, without
paying too much attention to the sub-packet length, and can send data through the interface at any time.
1.2 Features
Using automatic frequency hopping technology, it has strong anti-interference ability and stable communication;
Support two-way continuous data transmission function;
4-level port protection capability; IP67 protection;
Simple and high-efficiency power supply design, support power supply configuration or crimping mode, support 8
~ 28V power supply;
The transmit power can reach up to 12dbm, and all technical indicators meet European industrial standards;
Working temperature range: -40℃～+85℃, can adapt to various harsh working environments, real industrial grade
products;
Compact size, easy installation, good heat dissipation; perfect shielding design, good electromagnetic compatibility,
strong anti-interference ability;
Multiple protection functions such as power reverse connection protection, over-connection protection, antenna
surge protection, etc., greatly increase the reliability of the radio;
Simple and easy to use, wireless communication can be carried out after factory power-on and connection is
successful;
Built-in hardware watchdog and precise time layout. Once an exception occurs, the module will automatically
restart and continue to work according to the previous parameter settings.

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 4
2 Quick Start
User needs to prepare below parts:
1. First install the power supply for the two RS485 bridges, the red wire is connected to the positive pole of the DC
power supply, and the black wire is connected to the negative pole of the DC power supply.
2. Use USB to RS-485 to connect the computer to the RS485 bridge (brown wire is 485A+, blue wire is 485B-); then
power on the radio, the radio will automatically establish a connection with another radio.
8～28V DC
regulated power
supply

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 5
3. Start two serial port debugging assistants, connect two RS485 network bridges respectively, select the default serial
port baud rate of 9600bps, and the check method is 8N1, open the serial port, and the serial port transparent transmission
can be realized.
4. If the customer needs to modify the parameters, please disassemble the RS485 bridge, switch the module inside to the
configuration mode and connect to the computer, open the E92-DTU(HD) RS485 bridge configuration software, you can
modify the relevant parameters and complete the configuration. The DIP switch status must be restored before
communication can be carried out.
Transceiving Mode
Configuration Mode

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 6
3 Size

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
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4 Parameters
4.1 Model details
Model
Freq.
TX Power
Test range
feature
Application features
Hz
dBm
m
E92-DTU(2G4HD12)
2.4G
12
1200
Point-to-point frequency hopping
Bidirectional continuous transmission
Suitable for environments
with long communication
distances and susceptible to
interference
★Test range conditions: sunny and clear sky, test environment is open without obstruction, 12V/1A power supply, the
device is 2 meters above the ground, and the default parameters are used.
4.2 Regular parameters
No.
Name
Value
Description
1
Product Size
228*228*68 mm
See installation dimensions for details
2
Product Weight
1700g
3
Operating
temperature
-40℃～+85℃
Meet the need of industrial use
4
Voltage range
8～28V DC
Recommend to use 12V or 24V
5
Communication
Interface
RS485
3.81 Terminal block
6
Baud rate
Default 9600
Baud rate range 1200～3M
4.3 Frequency range and Channels
Mode
Main Freq.
Range
Channel Width
Channels
Hz
Hz
Hz
E92-DTU(2G4HD12)
2.4G
2.4～2.48G
1M
80（full duplex）

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 8
4.4 Electronic parameters
Mode
Ave. Tx Current mA
Ave. Standby Current mA
12V
24V
12V
24V
E92-DTU(2G4HD12)
35
18
35
18
★Note: 12V transient transmission MAX current: 66mA, 24V transient transmission MAX current: 33mA, it is
recommended to keep ≥50% MAX current margin when selecting the power supply, which is conducive to the long-term
stable operation of the radio.
4.5 Default parameters
Port rate
9600 bps
Proofread
0
Flow Control
0（closed）
Communication link
1
5 Detailed function
5.1 Point-to-point communication mechanism
The valid range of communication link value is 1 to 9999, which can be set by AT command or upper computer. The
factory default setting of the communication link value is "1";
If the connection is disconnected due to power failure, excessive distance, or strong interference, it is recommended
to adjust the distance appropriately or avoid obstacles, and the radio enters the search state again until it searches for
the device with the same link and establishes a connection.
If there are two or more E92-DTU (2G4HD12) bridges with the same communication link, and they are powered on
at the same time, a random connection will be established in pairs. If it involves multiple bridge applications, it is
recommended to configure the link value of each pair of bridges in advance to distinguish them.
5.2 Full duplex/high-speed continuous transmission
During two-way communication, especially when transferring files, the channel resources occupied by the two ends
are different, which will cause the transmission rate of one end to be slower than the other end, which is normal;
During continuous data transmission, such as sending large files, to make full use of the transmission rate, please
ensure that the data stream is continuous. Frequent small data frame breaks may reduce wireless transmission
efficiency.

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 9
6 Similar products
Mode
Interface
Freq.(Hz)
Tx Power
Test
Range
Main Features
E34-DTU(2G4H27)
RS232/RS485
2.4G
27dBm
5km
Automatic frequency hopping,
retransmission of lost packets
E34-DTU(2G4H20)
RS232/RS485
2.4G
20dBm
2.5km
Automatic frequency hopping,
retransmission of lost packets
E90-DTU(2G4HD12)
RS232/RS485
2.4G
12dBm
800m
Point-to-point frequency modulation,
two-way continuous transmission
E90-DTU(2G4L27)
RS232/RS485
2.4G
27dBm
8km
LoRa anti-interference, support LBT
7 User Notes and Safety Notice
1. Please take good care of the warranty card of the device. The warranty card has the factory number (and important
technical parameters) of the device, which has important reference value for the user's future maintenance and new
equipment.
2. During the warranty period of the radio station, if the product is damaged due to the quality of the product itself rather
than man-made damage or natural disasters such as lightning strikes, it enjoys a free warranty; please do not repair it by
yourself, and contact our company if there is a problem, which is provided by Ebyte First-class after-sales service.
3. Do not operate this radio in the vicinity of some flammable places (such as coal mines) or explosive dangerous objects
(such as detonators for detonation).
4. A suitable DC stabilized power supply should be selected, which requires strong anti-high frequency interference,
small ripple, and sufficient load capacity; preferably, it should also have over-current, over-voltage protection and
lightning protection functions to ensure RS485 network The bridge works normally.
5. Do not use it in a working environment that exceeds the environmental characteristics of the RS485 bridge, such as
high temperature, humidity, low temperature, strong electromagnetic field or dusty environment.
6. Don't let the RS485 bridge continuously be in the full-load transmission state, otherwise the transmitter may be burned
out.
7. Wireless RS485 bridges often have different communication distances in different environments. The communication
distance is often affected by temperature, humidity, obstacle density, obstacle volume, and electromagnetic environment;
in order to ensure stable communication, it is recommended to reserve 50 % Or more of the communication distance
margin.
8. If the measured communication distance is not ideal, it is recommended to analyze and improve the communication
distance from the antenna quality and antenna installation method. You can also contact suppo[email protected] for help.
9. When selecting the power supply, in addition to retaining 50% of the current margin as recommended, it should be
noted that its ripple should not exceed 100mV.

Chengdu Ebyte Electronic Technology Co.,Ltd. E92-DTU(2G4HD12) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 10
Copyrights Notice.
1. Ebyte reserves the right of final interpretation and modification of all contents in this manual.
2. Due to the continuous improvement of the hardware and software of the product, this manual may be changed without
prior notice, and the latest version of the manual shall prevail.
3. It is everyone's responsibility to protect the environment: In order to reduce the use of paper, this manual only prints
the Chinese part, and the English manual only provides electronic documents. If necessary, please download it from our
official website; in addition, if not specifically requested by the user, the user may order in bulk At the time, we only
provide the product manual according to a certain proportion of the order quantity, not every RS485 bridge is matched
with it, please understand.
Revision history
Version
Date
Description
Issued by
1.0
2021-06-02
Initial version
LM
About us
Technical support: supp[email protected]m
Documents and RF Setting download link: www.ebyte.com
Thank you for using Ebyte products! Please contact us with any questions or suggestions: [e-mail]
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