Ebyte E90-DTU User manual

Chengdu Ebyte Electronic Technology Co.,Ltd E90-DTU(400SL44) User Manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co.,Ltd
E90-DTU(400SL44)

Chengdu Ebyte Electronic Technology Co.,Ltd E90-DTU(400SL44) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd
1
CONTENTS
1. Introduction.................................................................................................................................................................2
1.1 Brief introduction..............................................................................................................................................2
1.2 Features.............................................................................................................................................................2
2. Quick start...................................................................................................................................................................3
3. Size..............................................................................................................................................................................4
3.1 Interface and instructions..................................................................................................................................4
4. Interface definition......................................................................................................................................................6
4.1 Power interface................................................................................................................................................. 6
4.2 RS232................................................................................................................................................................6
4.3 RS485................................................................................................................................................................6
5. Technical specification............................................................................................................................................... 6
5.1 Model specification.......................................................................................................................................... 6
5.2 General specification parameter....................................................................................................................... 6
5.3 Frequency and channel numbers...................................................................................................................... 7
5.4 Transmit power................................................................................................................................................. 7
6. Function description................................................................................................................................................... 8
6.1 Fixed Transmission (HEX)...............................................................................................................................8
6.2 Broadcast Transmission (HEX)........................................................................................................................9
6.3 Broadcast Address............................................................................................................................................ 9
6.4 Monitor Address............................................................................................................................................... 9
7. Operating mode.........................................................................................................................................................10
7.1 General mode..................................................................................................................................................10
7.2 Configuration mode........................................................................................................................................10
8. Register read and write control.................................................................................................................................11
8.1 Command format............................................................................................................................................ 11
8.2 Register description........................................................................................................................................ 11
8.3 Factory default parameter...............................................................................................................................14
9. Repeater networking mode.......................................................................................................................................15
10. Configuration instructions on computer.................................................................................................................16
11. E90-DTU.................................................................................................................................................................17
12. Application field..................................................................................................................................................... 18
13. Notes for use........................................................................................................................................................... 20
Important statement...................................................................................................................................................... 21
Revision history............................................................................................................................................................ 21
About us........................................................................................................................................................................ 21

Chengdu Ebyte Electronic Technology Co.,Ltd E90-DTU(400SL44) User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd
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1. Introduction
1.1 Brief introduction
E90-DTU (400SL44) is a true high-quality industrial wireless data transceiver. The transceiver uses LORA spread
spectrum technology. Its strong anti-interference ability makes wireless communication more stable and reliable in
industrial sites.
It has multiple transmission modes, working in the (410.125 ～493.125MHz) frequency band (the default is
433.125MHz), and the radio provides a transparent RS232 / RS485 interface. LoRa Direct Sequence Spread Spectrum
technology will bring longer communication distance and has the advantage of strong anti-interference ability. The
module has software FEC forward error correction algorithm, which has high coding efficiency and strong error
correction capability. In the case of sudden interference, it can actively correct the interfered data packets, which greatly
improves reliability and transmission distance. Without FEC, such packets can only be discarded. The transceiver has a
data encryption function. The data transmitted by the transceiver over the air is random. Through strict encryption and
decryption algorithms, the data interception is meaningless. Packet length setting is available to support different
real-time and data packets.
As a communication medium, wireless data transceiver has the same scope as optical fiber, microwave and bright
line: it provides real-time and reliable data transmission of monitoring signals in private networks under certain special
conditions, with low cost, installation and maintenance. It is convenient, has strong diffraction ability, flexible
networking structure and long coverage. It is suitable for occasions with many points and scattered, complex
geographical environment, etc. It can be connected with PLC, RTU, rain gauge, liquid level meter and other data
terminals.
1.2 Features
Environmental field strength dynamic indication, data packet RSSI dynamic indication;
Dual watchdog of software and hardware;
Dust-proof and moisture-proof;
easy to use and configured by the host computer;
Warranty for 6 years;
Use the latest LoRa technology, longer distance and more powerful performance than traditional LoRa digital radio
stations;
Use military-grade LoRa modulation technology, with data encryption function, the packet length is available for
configuration.
Large single packet, single packet is up to 240 bytes;
Simple and efficient power supply design, using crimping mode, support 12V power supply;
Transmit power can reach up to 25W;
Support LBT function, the transceiver automatically waits to send data according to the current ambient noise
intensity. The communication success rate of the module in harsh environments is greatly improved;
Support communication key function to effectively prevent data from being intercepted;

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Multi-level relay networking can be realized, which effectively extends communication distance for
ultra-long-distance communication;
With temperature compensation circuit, the frequency stability is better than ±1.5PPM;
All-aluminum alloy casing, compact size, easy to install and good heat dissipation; perfect shielding design, with
good electromagnetic compatibility and strong anti-interference ability;
Powerful software functions, all parameters can be programmed: such as power, frequency, air data rate, address ID,
etc;
Temperature monitoring, antenna abnormality monitoring.
2. Quick start
You need to prepare E90-DTU(400SL44) transceiver，Antenna，12V/10A power supply，Serial cable.
Note: The distance between two high-power DTU antennas should be more than 1 meter, otherwise it may cause
damage!
1. First install the antenna for the transceiver, and then install the power supply. Only the crimping mode is supported. At
this time, the power light is on and the abnormal light has no indication;
2. Connect the DTU to computer via USB to RS-232 or USB to RS-485 converter;
3. Start two serial port debugging assistants, select the serial port baud rate 9600bps, and the verification mode 8N1, and
realize transparent transmission.
4. If customer needs to modify the parameters, please short the MOD pin to GND and enter the configuration mode.
Open the E90-DTU SL configuration software to modify the relevant parameters. After completing the configuration,
please leave the MOD pin in floating status.

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3. Size
3.1 Interface and instructions

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No.
Name
Function
Description
1
PE
Connect to ground
Connect to ground
2
GND
Crimped power input negative
Power reference ground
3
VCC
Crimped power input positive
power input(12V/10A)
4
MOD
Mode control
Floating, general mode; ground,
configuration mode
5
RS485 G
RS485 interface G
RS485 interface G is connected to
the device GND interface
(recommended)
6
RS485 B
RS485 interface B
RS485 interface B is connected to
device B interface
7
RS485 A
RS485 interface A
RS485 interface A is connected to
device A interface
8
RS232
RS232 interface
Standard RS232 interface
9
ANT
SMA-K interface
External thread inner hole, 10mm,
characteristic impedance 50O
ohm
10
PWR
Power indicator
Red, lit when the power is on
11
TXD
Serial data sending indicator
Yellow, blinks when sending data
12
RXD
Serial data receiving indicator
Yellow, blinks when receiving
data
13
ERR
Warning indicator
Red, the temperature exceeds
100 ℃or the antenna is not
connected or the antenna is not in
good connection. After resolving,
you need to power on again
before working

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4. Interface definition
4.1 Power interface
Users uses the crimping method to supply power, 12V / 10A DC power supply.
4.2 RS232
E90-DTU can be connected to the device via RS232 using the standard DB-9 interface.
4.3 RS485
E90-DTU can use A, B, G of RS485 interface and A, B, G of equipment's RS485 respectively.
Note: When the radio is connected to multiple devices, communication is not smooth, but it is not the case with a
single device. Please try to connect a 120 ohm matching resistor in parallel between the 485_A and 485_B terminals.
5. Technical specification
5.1 Model specification
Model No.
Frequency
TX power
Distance
Features
Recommended application
Hz
W
km
E90-DTU(400SL44)
433.125M
25
40
LoRa,
anti-interference
Suitable for long distance and
susceptible environments
Note: Test condition: in clear and open air without shelters, 12V /10A power supply, 5dBi gain sucker antenna over 2
meters height from the ground, with the factory default parameters.
5.2 General specification parameter
No.
Item
Value
Note
1
Size
160*137*44mm
See chapter 3.Size for details
2
Weight
846.2g
Weight tolerance 4.5g
3
Temperature
-40℃～+85℃
Meet the needs of industrial grade use

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4
Antenna
impedance
50Ω
Standard 50 Ω characteristic impedance
5
Supply voltage
12V DC
Recommended to support instantaneous current 10A
6
Communication
interface
RS232/RS485
Standard DB9 hole / 5.08 terminal block
7
Baud rate
Factory default 9600
Baud rate range 1200～115200
8
Address code
Factory default 0
65536 configurable address codes
5.3 Frequency and channel numbers
Model No.
Default
Frequency
Frequency Range
Channel
Interval
Channel numbers
Hz
Hz
Hz
E90-DTU(400SL44)
433.125M
410.125～493.125M
1M
84，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 interval between each group of data transceivers at 2MHz or more.
5.4 Transmit power
Model No.
25W
E90-DTU(400SL44)
Factory default, not adjustable
5.5 Air data rate
Model No.
Default
Levels
Air data rate (bps)
bps
bps
E90-DTU(400SL44)
2.4k
8
0.3、1.2、2.4、4.8、9.6、19.2、38.4、62.5k
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.
5.6 Current parameter
Model No.
Supply voltage V
TX current mA
Standby current
mA
E90-DTU(400SL44)
12
5500
84
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.
5.7 TX and RX FIFO and sub-packing method

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Model No.
Buffer
Sub-packing method
E90-DTU(400SL44)
1000 bytes
Can be sub-packed to 32/64/128/240 byte transmission each
time via command
Note:1. When the receiving data is more than a single packet capacity, the beyond part will be automatically assigned to
the second transmission until it is completed;
2. The data transceiver cannot receive data which is more than the buffer capacity.
6. Function description
6.1 Fixed Transmission (HEX)
During fixed-point transmission, the module recognizes the first three bytes of the serial data received as:
Address high + address low + channel, and use it as a wireless transmission target.

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6.2 Broadcast Transmission (HEX)
6.3 Broadcast Address
For example: Set the address of module A as 0xFFFF and channel as 0x04.
When module A is the transmitter (same mode, transparent transmission), all modules under channel 0x04 will
receive the data, the purpose of broadcast is realized.
6.4 Monitor Address
For example: Set the address of module A as 0xFFFF and channel as 0x04;
When module A is the receiver, it can receive the data sent from all modules under channel 0x04. The purpose of
monitor is realized.

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7. Operating mode
E90-DTU has two operating modes. The MOD pin is left floating, is the general mode, that is, the transceiver
communicates normally; the MOD pin is grounded, and that is the configuration mode.
Categories
Notes
General mode
Open UART port and RF，transparent transmission(Factory default mode)
Configuration
mode
Users access the register through the serial port to control the working state of the
device. The DTU can be configured through the configuration software on computer.
7.1 General mode
Type
Module works in general mode (MOD pin is floating)
Transmitting
Users can input data via UART. The device will start wireless transmission.
Receiving
Wireless receiving is enabled, data received will be output via pin TXD.
7.2 Configuration mode
Type
Module works in configuration mode (MOD pin grounded)
Transmitting
Wireless transmission is off.
Receiving
Wireless receiving is off.
Configuration
Users can visit register to configure the module working parameters.

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8. Register read and write control
8.1 Command format
In configuration mode, supported commands are as follows（only 9600，8N1 are available）：
No.
Command
format
Description
1
Configure register
command：C0+start address+length+parameter
Response：C1+start address+length+parameter
Example 1：set channel as 0x09
command start address length parameter
Transmit：C0 05 01 09
Return：C1 05 01 09
Example 2 ：set module address （0x1234),network address (0x00),UART(9600 8N1),air data
rate(1.2K)
Transmit：C0 00 04 12 34 00 61
Return：C1 00 04 12 34 00 61
2
Read register
Command：C1+start address+length
Response：C1+start address+length+parameter
Example 1: read channel
command start address length parameter
Transmit：C1 05 01
Return：C1 05 01 09
Example 2: read module address, network address, UART and air data rate
Transmit：C1 00 04
Return：C1 00 04 12 34 00 61
3
Format error
Response:
FF FF FF
8.2 Register description
Addres
s
Read/
Write
Name
Description
Remark
00H
Read/
Write
ADDH
ADDH（Default 0）
High and low byte of the module
address. Note ：When the module
address is FFFF, it can be used as
the broadcast and monitor address,
that is the module will not perform
address filtering.
01H
Read/
Write
ADDL
ADDL（Default 0）
02H
Read/
Write
NETID
NETID（Default 0）
Network address, used to distinguish
the network. When communicating
with each other, they should be set to
the same.

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03H
Read/
Write
REG0
7，6，5 UART baud rate（bps）
000：baud rate is 1200
001：baud rate is 2400
010：baud rate is 4800
011：baud rate is 9600（Default）
100：baud rate is 19200
101：baud rate is 38400
110：baud rate is 57600
111：baud rate is 115200
-----------------------------------------------
4，3：UART parity bit
00：8N1（Default）
01：8O1
10：8E1
11：8N1（same as 00）
---------------------------------------------------
2，1，0，air data rate
000：air data rate is 0.3k
001：air data rate is 1.2k
010：air data rate is 2.4k（Default）
011：air data rate is 4.8k
100：air data rate is 9.6k
101：air data rate is 19.2k
110：air data rate is 38.4k
111：air data rate is 62.5k
For the two modules that
communicate with each other, the
serial port baud rate can be different,
and the verification method can also
be different.
When transmitting large packets
continuously, users need to consider
the data blocking caused by the
same baud rate, and data may even
be lost. It is generally recommended
that both parties have the same baud
rate.
--------------------------------
It should be the same for both
communication parities.
The higher the rate, the shorter the
distance.
04H
Read/
Write
REG1
7，6：sub-packing setting
00：240byte （Default）
01：128byte
10：64byte
11：32byte
-----------------------------------------------
5：enable RSSI environmental noise
1：on
0：off（Default）
-----------------------------------------------
4，3，2 reserve
-----------------------------------------------
1，0：TX power
00：44dbm（Default）
01：44dbm
10：44dbm
11：44dbm
When the data is smaller than the
sub packet length, the serial output
of the receiving end is an
uninterrupted continuous output.
When the data is larger than the sub
packet length, the receiving end
serial port will output the
sub-packet.
--------------------------------
When enabled, the C0 C1 C2 C3
command can be sent in the
transmitting mode or WOR
transmitting mode to read the
register.
Register 0x00: Current ambient noise
rssi
Register 0X01: rssi when the data
was received last time.
（Current channel noise is: dBm
=-RSSI/2）
Command format: C0 C1 C2 C3 +
starting address + read length
Return: C1 + address address + read
length + read valid value
E.g: send C0 C1 C2 C3 00 01
Return C1 00 01 rssi
--------------------------------
Power and current are nonlinear, and
power efficiency is highest at
maximum power.
The current does not decrease in
proportion to the decrease in power.

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05H
Read/
Write
REG2
Channel control（CH）
0-83 stands for 84 channels respectively
Actual frequency= 410.125 + CH
*1.0M
06H
Read/
Write
REG3
7 enable RSSI byte
1：on
0：off（Default）
-----------------------------------------------
6，fixed transmission
1：fixed transmission
0: transparent transmission（Default）
-----------------------------------------------
5 enable repeater
1：on
0：off
-----------------------------------------------
4 enable LBT（monitor before transmit）
1：on
0：off（Default）
-----------------------------------------------
3 WOR TX and RX control
1：WOR transmitter
TX and RX are enabled, certain
preamble code is added when transmitting date.
Data receiving is on.
0：WOR receiver（Default）
Transmission is unavailable. Module
works in WOR monitoring mode, (see details
about WOR time below) to save power.
-----------------------------------------------
2，1，0，WOR period
000：500ms
001：1000ms
010：1500ms
011：2000ms（Default）
100：2500ms
101：3000ms
110：3500ms
111：4000ms
When enabled, the module receives
wireless data and it will follow an
RSSI strength byte after output via
the serial port TXD
--------------------------------
The module recognizes the first
three bytes of the serial data as:
address high + address low +
channel and takes it as the wireless
transmitting target.
--------------------------------
After the reply function is enabled,
if the target address is not the
module itself, the module will
forward it once.
In order to prevent data return-back,
it is recommended to use it in
conjunction with the fixed point
mode. That is: the target address is
different from the source address.
--------------------------------
When enabled, wireless data will be
monitored before it is transmitted,
which can avoid interference to a
certain extent, but may cause data
delay.
The maximum lingering time of
LBT is 2 seconds, and it will be be
forced to sent out when it reaches 2
seconds.
--------------------------------
Invalid
After the WOR receiver receives the
wireless data and outputs it through
the serial port, it will wait for
1000ms before entering the WOR
again. Users can input the serial port
data and return it via the wireless
during this period. Each serial byte
will be refreshed for 1000ms. Users
must transmit the first byte within
1000ms.
-------------------------------
Invalid
Period T= （1+WOR ）*500ms ，
Max 4000ms，Min 500ms
The longer the WOR monitoring
interval period, the lower the
average power consumption, but the
greater the data delay
Both the transmitter and the receiver
must be the same (very important).
07H
Write
CRYPT_H
key high byte（Default 0）
Write only, read and return 0.

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Used for user encryption to avoid
intercepting airborne wireless data
by similar modules.
The module will internally use these
two bytes as a calculation factor to
transform and encrypt the
over-the-air wireless signal.
08H
Write
CRYPT_L
key low byte（Default 0）
80H~
86H
Read
only
PID
7 bytes of product information
product information: 7 bytes
8.3 Factory default parameter
No.
Default parameter：62 00 17 03 00 00
Model No.
Frequency
Address
Channel
Air data rate
Baud rate
Parity bit
TX
power
E90-DTU
(400SL44)
433.125MHz
0x0000
0x17
2.4kbps
9600
8N1
44dbm

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9. Repeater networking mode
No.
Description
1
After setting the repeater mode by configuration, switch to the general mode and the repeater starts working.
2
In the repeater mode, ADDH, ADDL are no longer used as the module address, but is correspondingly paired with
the NETID. If the data of one of the networks is received, it is forwarded to another network. The network ID of the
repeater itself is invalid.
3
In the repeater mode, the repeater module UART cannot transmit and receive data, and cannot perform low-power
operation.
Repeater networking rules:
1. Forwarding rules, the repeater can forward data in both directions between two NETIDs.
2. In repeater mode, ADDH\ADDL is no longer used as the module address, but as a NETID forwarding pairing.
3. In the repeater mode, please do not send more than the set single packet sub-byte.
As shown in the Figure:
1Primary repeater
“Node 1” NETID is 08.
“Node 2” NETID is 33.
Primary repeater 1‘s ’ADDH\ADDL are 08，33.
So the signal sent by node 1 (08) can be forwarded to node 2 (33)
At the same time, node 1 and node 2 have the same address, so the data transmitted by node 1 can be received by node 2.
②Secondary repeater
Secondary repeater’s ADDH\ADDL are 33，05.
Therefore, Repeater 2 can forward the data of Repeater 1 to the network NETID: 05.
Thus node 3 and node 4 can receive node 1 data. Node 4 outputs data normally, and node 3 has a different address than
node 1, so no data is output.
3Two-way repeater
As shown in the figure: the data sent by node 1, the nodes 2, 4 can receive the data sent by node 2, 4, and node 1 can also
receive it.

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10. Configuration instructions on computer
The following picture shows the E90-DTU SL configuration interface on computer, users can switch to the
configuration mode through M0D pin ground, and quickly configure and read the parameters on computer.
In the configuration on computer, the module address, frequency channel, network ID, and key are all in decimal
mode. The range of values of each parameter is:
Network address: 0-65535

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Frequency channel: 0-83
Network ID: 0-255
Key: 0-65535
When users configure the repeater mode using the host computer, special attention must be paid. Since the
parameters are in decimal mode in the host computer, the module address and network ID need to be converted into
hexadecimal. For example, if the network ID input by the transmitting end A is 02, and the network ID input by the
receiving end B is 10, when the repeater end R sets the module address, the hexadecimal value 0X020A is converted
into the decimal value 522 as the repeater end R. Module address. That is, the module address value of the repeater
terminal R is 522 at this time.
11. E90-DTU
Model No.
Interface
Frequency
Hz
TX
Power
dBm
Distance
km
Features
E90-DTU(230SL22
)
RS232 RS485
230M
0.16
5
Low frequency LoRa, wireless configuration,
networking transmission, ultra strong diffraction ability
for complex environment
E90-DTU(230SL30
)
RS232 RS485
230M
1
10
Low frequency LoRa, wireless configuration,
networking transmission, ultra strong diffraction ability
for complex environment
E90-DTU(400SL22
)
RS232 RS485
433\470M
0.16
5
LoRa,wireless configuration，networking transmission,
long distance, anti-inference
E90-DTU(400SL30
)
RS232 RS485
433\470M
1
10
LoRa,wireless configuration，networking transmission,
long distance, anti-inference
E90-DTU(900SL22
)
RS232 RS485
868\915M
0.16
5
LoRa,wireless configuration，networking transmission,
long distance, anti-inference
E90-DTU(900SL30
)
RS232 RS485
868\915M
1
10
LoRa,wireless configuration，networking transmission,
long distance, anti-inference
E90-DTU(170L30)
RS232 RS485
170M
1
8
LoRa，strong diffraction ability
E90-DTU(433L30)
RS232 RS485
433M
1
8
LoRa，long distance, anti-inference
E90-DTU(433L37)
RS232 RS485
433M
5
20
LoRa，20km ultra long distance, anti-inference
E90-DTU(433C30)
RS232 RS485
433M
1
3
High-speed continuous transmission，ModBus protocol
E90-DTU(433C33)
RS232 RS485
433M
2
4
High-speed continuous transmission，ModBus protocol
E90-DTU(433C37)
RS232 RS485
433M
5
10
High-speed continuous transmission，ModBus protocol，
long distance
E90-DTU(230N27)
RS232 RS485
230M
0.5
5
Low frequency narrow band，for complex environment
E90-DTU(230N33)
RS232 RS485
230M
2
8
Low frequency narrow band，for complex environment
E90-DTU(230N37)
RS232 RS485
230M
5
15
Low frequency narrow band， for complex environment，
strong diffraction ability

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12. Application field
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 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:

Chengdu Ebyte Electronic Technology Co.,Ltd E90-DTU(400SL44) User Manual
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