Ebyte E78-DTU(470LN22) User manual

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
E78-DTU(470LN22)

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
1
Table of contents
Disclaimer and Copyright Notice ...........................................................................................................................................1
1. Overview ............................................................................................................................................................................ 2
1.1. Introduction .............................................................................................................................................................2
1.2. Features ...................................................................................................................................................................2
2. Quick Start ......................................................................................................................................................................... 3
3. Installation Dimensions ......................................................................................................................................................8
3.1. Size(Unit: mm) ....................................................................................................................................................... 8
3.2. Interfaces .................................................................................................................................................................9
4. Interface Definition .......................................................................................................................................................... 10
4.1. Power interface description .................................................................................................................................. 10
4.2. RS485 interface definition .................................................................................................................................... 11
5. Technical Specifications .................................................................................................................................................. 12
5.1. Model Specifications ............................................................................................................................................ 12
5.2. General Specifications .......................................................................................................................................... 12
6. Working Mode ................................................................................................................................................................. 13
6.1. Transparent transmission mode (mode 0) .............................................................................................................13
6.2. Configuration Mode (Mode 2) ..............................................................................................................................13
7. Detailed function .............................................................................................................................................................. 14
7.1. Transparent transmission mode ............................................................................................................................ 14
7.2. Active Polling ....................................................................................................................................................... 14
7.3. Remote configuration ........................................................................................................................................... 14
7.4. Serial port upgrade ................................................................................................................................................14
8. Host Computer Configuration Instructions ...................................................................................................................... 16
9. AT Command Configuration Instructions ....................................................................................................................... 19
10. Revision History .............................................................................................................................................................47
11. Contact Us ...................................................................................................................................................................... 48

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
1
Disclaimer and Copyright Notice
Information in this document, including URL addresses for reference, is subject to change without not
ice. Documentation is provided "as is" without warranty of any kind, including any warranties of merchan
tability, fitness for a particular purpose, or non-infringement, and any warranties referred to elsewhere in a
ny proposal, specification or sample. No responsibility is assumed in this document, including any liability
for infringement of any patent rights arising out of the use of the information in this document. This do
cument does not hereby grant, by estoppel or otherwise, any license, express or implied, to use any intell
ectual property rights.
The test data obtained in this article are all obtained by the Ebyte laboratory test, and the actual res
ults may be slightly different.All trade names, trademarks and registered trademarks mentioned herein are t
he property of their respective owners and are hereby acknowledged.
Final interpretation right belongs to Chengdu Ebyte Electronic Technology Co., Ltd.
Note :
Due to product version upgrade or other reasons, the contents of this manual may be changed. Ebyte
Electronic Technology Co., Ltd. reserves the right to modify the contents of this manual without any not
ice or prompt. This manual is only used as a guide. Chengdu Ebyte Electronic Technology Co., Ltd. does
its best to provide accurate information in this manual. However, Chengdu Ebyte Electronic Technology
Co., Ltd. does not ensure that the contents of the manual are completely error-free. All statements in this
manual , information and advice do not create any express or implied warranties.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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1. Overview
1.1. Introduction
E78-DTU(470LN22) product is a standard LoraWan node radio designed
and produced by Chengdu Ebyte Electronic Technology Co. , Ltd. It is devel
oped based on our company's E78-470LN22 S module. The working frequenc
y band is CN470~510MHZ and supports CLASS –A/CLASS- C node type, s
upports ABP/OTAA two network access methods ; the external communicatio
n interface of the radio adopts RS485 communication , the user can access t
he standard LoraWan network through AT commands or simple configuration
of the host computer , and the radio has transparent transmission and active
polling. It supports serial port upgrade and remote configuration, and is an e
xcellent choice for current IoT applications.
1.2. Features
Serial port upgrade;
Support transparent transmission;
Support active polling;
Support hardware reset;
Adopt Lo R a Wan communication technology ;
Support automatic modbus CRC check;
AT command/host computer/remote configuration;
Working temperature range: -40℃～+85℃, suitable for all kinds of harsh working environment, real i
ndustrial grade products.
All aluminum alloy shell, compact size, easy installation, good heat dissipation; perfect shielding desi
gn, good electromagnetic compatibility, strong anti-interference ability.
Power reverse connection protection, over-connection protection, antenna surge protection and other m
ultiple protection functions greatly increase the reliability of the radio.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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2. Quick Start
you need to prepare: Radio antenna power adapter 485 communication line。
1.First install the antenna for the radio, then install the power supply, and make sure that the DIP switch
is in the correct state. The user can choose either the crimping methodor the power adapter to supply p
ower according to their needs;
2.Use USB to RS-485 to connect the computer to the radio;
3.Start a serial port debugging assistant, select the serial port baud rate as 9600bps, and check the mode
as 8N1.After the network access parameters are configured by THE AT instruction or the upper computer,
the device will automatically send the network access request, and the device can access the network aft
er the nearby gateway accepts the request
Access demo:

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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In this demonstration kit, the device is used as a node, and E890-470LG11 is used as a gateway to
access the free ChirpStack Application Server test server for communication testing; the corresponding setti
ngs of the OTAA access method on the node side are as follows:
On ChirpStack Application Server, the gateway data record looks like this:

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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ChirpStack Application Server node data record is as follows:
An example of access in transparent transmission mode is as follows:

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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APP in transparent transmission mode Server receives data:
Note: Please refer to "LORAWAN Node + Gateway TTN Server Configuration Tutorial" for the TTN crea
tion device and corresponding configuration proces

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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3. Installation Dimensions
3.1. Size(Unit: mm)

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
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3.2. Interfaces
No.
Name
Function
Description
1
DB-9 female sock
et
RS-232 interface
Standard RS-232 interface
2
3.81 Terminals
RS-485, power inte
rface
Standard RS-485 interface and crimped power
interface
3
PWR-LED
Power Indicator
Red, lights up when the power is on
4
LINK -LED
send indicator
Yellow, flashes when sending data
5
DATA -LED
Receive indicator
Yellow, blinks when receiving data
6
DC power interfac
e
Power interface
In-line round hole, outer diameter 5.5mm, inn
er diameter 2.5mm
7
DIP switch
DIP switch
Reload and RST DIP switch
8
Antenna interface
SMA-K interface
External thread inner hole, length 10mm, cha
racteristic impedance 50Ω

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
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4. Interface Definition
4.1. Power interface description
Users can choose ⑥DC power interface for power supply, and use the interface to supply power to the
power adapter with an outer diameter of 5.5mm and an inner diameter of 2.5mm;
You can also supply power to the VCC terminal and GND terminal in ②, just choose any one of the po
wer supply methods;
E78-DTU can be powered by 8 ~ 28 V DC power supply, 12V or 24V DC power supply is recommende
d.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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4.2. RS485 interface definition
E78-DTU can use the 485_A terminal and 485_B terminal in ②to connect with the A terminal and B te
rminal of the RS-485 of the device respectively.
Foot nu
mber
standard defin
ition
Function
illustrate
1
VCC
Crimp power interface, pos
itive
DC 8~ 28V, 12V or 24V is recommended
2
GND
Crimp power interface, neg
ative pole
The negative pole of the power supply is co
nnected to the system ground and the shell
3
485_B
RS-485 interface, B interfa
ce
RS-485 interface B interface is connected wi
th device B interface
4
485_A
RS-485 interface, A interfa
ce
The RS-485 interface A interface is connecte
d to the device A interface

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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5. Technical Specifications
5.1. Model Specifications
Model
working freque
ncy
TX
power
Ideal
Ranbge
Specifications
Hz
W
km
E78-DTU(470LN22)
470-510Mhz
22dbm
3KM
LoRa Wan syste
m
Note: Reference distance test environment: sunny weather, open environment without obstruction, 12 V2A
power supply, 5dBi gain suction cup antenna, the antenna height is 5 metes from the ground, and the fac
tory default parameters are used.
5.2. General Specifications
No.
Name
Specification
remark
1
Product Size
100*84*25mm
See chapter 3.1 for details
2
product weight
120g
Weight tolerance 5 g
3
Operating temperature
-40℃～85 ℃
Meet the needs of industrial use
4
Antenna impedance
50Ω
Standard 50Ω impedance
5
voltage range
8～28v DC
12V or 24 V recommended
6
Current parameters
TX current: 15mA@12
V
Standby current: 10mA@12V
7
Interface
RS232/RS485
Standard DB9 hole,3.81 terminal block
8
baud rate
Factory default 9600
9
Address capacity
Factory default 0
Max 65536 address available

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
Copyright © 2012–2022 , Chengdu Ebyte Electronic Technology Co., Ltd.
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6. Working Mode
E78-DTU has two working modes, the radio is configured as transparent transmission mode for norm
al communication; the default setting of the radio is also transparent transmission mode when it leaves th
e factory.
Mode
Notes
Communication mode
In this mode, the device can communicate with the
server
configuration mode
AT command configuration mode
6.1. Transparent transmission mode (mode 0)
type
Notes
TX
Users can input data through the serial port, and the module will start wireless
transmission.
RX
The wireless receiving function of the module is turned on, and after receiving
wireless data, it will be output through the serial port TXD pin.
6.2. Configuration Mode (Mode 2)
type
Notes
TX
off
RX
off
configure
User can access registers to configure module operating status

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
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7. Detailed function
7.1. Transparent transmission mode
In this mode, the radio can configure the network access parameters through AT commands or the ho
st computer. After the radio successfully accesses the network, the data communication between the radio
and the lorawan server can be realized.
7.2. Active Polling
Active polling mode can be configured through the host computer or AT command, this mode suppor
ts HEX mode, supports automatic modbus CRC check, and can configure 64 polling commands.
7.3. Remote configuration
When the radio is successfully connected to the network, the parameters of the radio can be configur
ed by sending commands from the lorawan server.
7.4. Serial port upgrade
The firmware can be upgraded through the RS485 serial port. The specific demonstration is as follow
s:
Connect the device to the computer and open the upgrade tool.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
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Select the corresponding port and open it, select the firmware package to be upgraded, and click to s
tart the upgrade after importing.
At this time, power on the device that needs to be upgraded, and then it can be upgraded by itself.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
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8. Host Computer Configuration Instructions
Parameters can be configured through the host computer, as shown in the following figure:
Arrow 1: Select the port corresponding to the device and the baud rate data bit, parity bit, stop bit in thi
s area
Arrow 2: Click to enter the configuration state after selecting the appropriate port information
Arrow 3: After entering the configuration, click to read the device parameters
Arrow 4: After modifying the parameters, click to save the modified configuration
Arrow 5: Click to exit configuration state
Arrow 6: After entering the configuration, click to restart the device
Arrow 7: After entering the configuration, read the parameters to read the model and version information
of the device
Arrow 8: After entering the configuration, modify the serial port parameter information of the device in th
is area, and restart the device after saving the configuration.

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
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Arrow 9: Select the working mode in the drop-down box: TRANS is the transparent transmission mode,
POLL is the polling mode
Arrow 10: drop-down box to select whether to confirm the data
Arrow 11: drop-down box to select the number of times to send a single packet of data (1-8)
Arrow 12: Select the CLASS class of the device (CLASSA/CLASSC)
Arrow 13: Select the network access method of the device (OTAA/ABP)
Arrow 14: Enter the network access parameters in OTAA mode in this area
Arrow 15: Enter the network access parameters in ABP mode in this area
Arrow 16: Select DR level or previous ADR (Auto Adjustment Level)
Arrow 17: Select the frequency band (CH0-CH7) under CN470

Chengdu Ebyte Electronic Technology Co., Ltd. E78-DTU(470LN22) User Manual
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Arrow 18: Set the polling command number
Arrow 19: Turn on or off a command enable
Arrow 20: Set the command's response timeout ( 10-3000ms )
Arrow 21: Set the waiting time from executing a complete polling cycle to the next polling cycle (3000-5
0000ms)
Arrow 22: Input the specific command to be polled in the input box
Arrow 23: Click to add instructions to the buffer
Arrow 24: Select the buffer area command and click the modify command to synchronize the parameters
to the setting area
Arrow 25: Set the command sending times
Arrow 26: Select the selected cache area command and click the delete command to delete it
Arrow 27: Click to read the existing instruction of the device to the buffer area
Arrow 28: Click to write the buffer command to the device
Arrow 30: Click to delete device instruction