Ebyte E90-DTU User manual

Chengdu Ebyte Electronic Technology Co., Ltd. E90-DTU（900SL30）User Manual
Copyright©2012–2019,Chengdu Ebyte Electronic Technology Co., Ltd.
E90-DTU(900SL30)

Chengdu Ebyte Electronic Technology Co., Ltd. E90-DTU（900SL30）User Manual
Copyright©2012–2021,Chengdu Ebyte Electronic Technology Co., Ltd.
1
Contents
2. Introduction.........................................................................................................................................................................1
2.1. Brief introduction.................................................................................................................................................... 1
2.2. Certificate................................................................................................................................................................ 1
2.3. Features................................................................................................................................................................... 2
3. Quick Start.......................................................................................................................................................................... 3
4. Dimensions......................................................................................................................................................................... 5
4.1. Parts description...................................................................................................................................................... 5
4.2. Dimensions..............................................................................................................................................................6
5. Interface definition..............................................................................................................................................................7
5.1. Power interface........................................................................................................................................................7
5.2. RS232...................................................................................................................................................................... 7
5.3. RS485...................................................................................................................................................................... 7
6. Technical specification....................................................................................................................................................... 8
6.1. Model specification................................................................................................................................................. 8
6.2. General specification parameter..............................................................................................................................8
6.3. Frequency and channel numbers............................................................................................................................. 8
6.4. Transmitting power................................................................................................................................................. 9
6.5. Air data rate............................................................................................................................................................. 9
6.6. Current.....................................................................................................................................................................9
6.7. TX and RX FIFO and sub-packing method............................................................................................................ 9
7. Function Description.........................................................................................................................................................10
7.1. Fixed Transmission............................................................................................................................................... 10
6.2 Broadcast Transmission......................................................................................................................................... 10
6.3 Broadcast Address..................................................................................................................................................11
6.4 Monitor Address.....................................................................................................................................................11
8. Operating mode.................................................................................................................................................................11
8.1. Normal mode（Mode 0）.....................................................................................................................................12
8.2. WOR mode（Mode 1）....................................................................................................................................... 12
8.3. Configuration mode（Mode 2）.......................................................................................................................... 12
8.4. Sleep mode（Mode 3）........................................................................................................................................12
9. Register read and write control.........................................................................................................................................13
9.1. Command format...................................................................................................................................................13
9.2. Register description...............................................................................................................................................14
9.3. Factory default parameter......................................................................................................................................16
10. Repeater networking mode............................................................................................................................................. 16
①Primary repeater...................................................................................................................................................... 16
②Secondary repeater............................................................................................................................................... 16
③Two-way repeater....................................................................................................................................................16
11. Configuration instructions on computer......................................................................................................................... 17
12. Programming the modem................................................................................................................................................18
12.1. Connection diagram............................................................................................................................................ 18
12.2. Connection diagram in test and practical application..........................................................................................19
13. E90-DTU Series..............................................................................................................................................................20

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14. Application field............................................................................................................................................................. 21
15. Operation notes...............................................................................................................................................................22
16. About us..........................................................................................................................................................................22

Chengdu Ebyte Electronic Technology Co., Ltd. E90-DTU（900SL30）User Manual
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1. Introduction
1.1. Brief introduction
E90-DTU (900SL30) is a data transceiver with military-grade LoRa modulation technology. With multiple transmission modes, it
works in the (850.125~930.125MHz) frequency band (Default 868.125MHz). The transceiver provides transparent RS232/RS485
interface and supports 8~. 28V voltage input. LoRa direct-sequence spread spectrum technology will bring longer communication
distances, and has the advantages of concentrated power density and strong anti-interference ability. It features a software FEC forward
error correction algorithm, which has high coding efficiency and strong error correction capability. In the case of sudden interference,
it can proactively correct the interfered data packets, greatly improving reliability and transmission distance. In the absence of FEC,
such packets can only be discarded. It has data encryption. The data transmitted by the transceiver over the air is random, and the data
interception is meaningless through strict encryption and decryption algorithms. Packet length setting is available to support different
real-time and data packets.
It works in the ISM 868/915MHz band with a communication distance of up to 10km. 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. Certificate
E90-DTU is certified with CMIIT ID:2017FP5780 by SRRC.
E90-DTU is certified with “Certificate of conformity on explosive application protection”，ID: 201711000975.
E90-DTU is certified with “Electrostatic surge test report” by National Institute of Measurement and Testing Technology，ID ：
CNEx18.1461.
E90-DTU is certified with “Certificate of Design Patent”，Patent Number：ZL 2016 3 0501980.3.
E90-DTU is certified with “Utility model patent certificate”，Patent Number：ZL 2016 2 1410691.3.
E90-DTU is certified with “CE” , ID：CCISE180514601V.
E90-DTU is certified with “FCC”, ID：2ALPH-E90-DTU.
E90-DTU is certified with “RoHS”，ID：DTI201807025245.

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1.3. Features
★All core components are imported, featuring the most advanced functions, the smallest volume and the best price.
★Using military-grade LoRa modulation technology, with data encryption, the packet length is available for configuration.
★Large single package, single package is up to 240 bytes, adapt to Modbus.
★Simple and efficient power supply design, support power adapter or crimping mode, support 8~28V power supply.
★Transmit power is up to 1W, multi-level adjustable, with all technical indicators meeting European industrial standards.
★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.
★Remotely configure or read wireless module parameters by sending command packets wirelessly.
★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.
★Operating temperature range: -40 ° C ~ +85 ° C, to adapt to a variety of harsh working environment.
★All-aluminum alloy casing, compact size, easy installation and good heat dissipation; perfect shielding design, with good
electromagnetic compatibility and strong anti-interference ability.
★Multiple protection functions such as power reverse connection protection, over-current protection, and antenna surge protection
greatly increase the reliability of the device.
★Powerful software functions, all parameters can be programmed: such as power, frequency, air data rate, address ID, etc.
★Ultra-low power consumption, the standby current is only 10mA (lower than power consumption in power-saving mode and sleep
mode), and the transmitting current is ≤0.1A.
★With built-in watchdog and precise time layout, once an exception occurs, the transceiver will automatically restart, and continue
to work according to the previous parameters.

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2. Quick Start
You need to prepare items below,
1. First install the antenna for device, then install the power supply, and ensure that the dial switch is in the
correct state. The user can select the crimping method or the power adapter to supply power according to the
requirements.
2. Connect the DTU to computer via USB to RS-232 or USB to RS-485 converter etc.

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3. Start two serial port debugging assistants, select the baud rate 9600bps, check mode as 8N1 to realize transparent transmission.
4. If customer needs to modify the parameters, please dial the switch in the configuration mode and connect to the computer. Open
the E90-DTU SL configuration software, you can modify the relevant parameters. After completing the configuration, you must
restore the DIP switch status for communication.
Mode 0 Factory default Mode 2 Parameter configuration

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3. Dimensions
3.1. Parts description
No.
Name
Function
Note
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

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3.2. Dimensions
单位：mm

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4. Interface definition
4.1. Power interface
Users can choose ⑥DC power interface,using the power adapter supply with the interface of the 5.5mm outer diameter , 2.5mm
diameter ;
Also users can choose the VCC and GND terminal power supply from ②, both are optional；
8 ~ 28V DC power supply, it is recommended to use 12V or 24V DC power supply for E90-DTU.
4.2. RS232
The E90-DTU can be connected to the device via RS-232 using the standard DB-9 interface.
4.3. RS485
E90-DTU can be connected to the 485_A terminal and 485_B terminal from ②with the RS-485 A terminal and B terminal of
other device respectively.
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
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.

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5. Technical specification
5.1. Model specification
Model No.
Frequency
Power
Distance
Features
Recommended application
Hz
dBm
km
E90-DTU(900SL30)
868.125M
30
10
LoRa，
anti-interference
Suitable for transmission of fast speed in
complex environment with data
interference over a long distance
★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 parameter
No.
Item
Value
Note
1
Size
82 * 62 * 25 mm
See more in 3.2. Dimensions.
2
Weight
130g
±4.5 g
3
Temperature
-40℃～85℃
Meet industrial request
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 1200~115200
8
Address
Default 0
65536 configurable address
5.3. Frequency and channel numbers
Model No.
Default Frequency
Frequency Range
Channel Interval
Channel numbers
Hz
Hz
Hz
E90-DTU(900SL30)
868.125M
850.125~930.125MHz
1M
81，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.

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5.4. Transmitting power
Model No.
30dBm
27dBm
24dBm
21dBm
E90-DTU(900SL30)
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.
5.5. Air data rate
Model
Default
Levels
Air data rate
bps
bps
E90-DTU(900SL30)
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
Model
TX current mA
Standby current mA
12V
24V
12V
24V
E90-DTU(900SL30)
386
196
21
13
★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
Model No.
Buffer
Sub-packing method
E90-DTU(900SL30)
1000 bytes
Can be sub-packed to 32/64/128/240 byte 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 can not receive data which is more than the buffer capacity;

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6. Function Description
6.1. Fixed Transmission
6.2 Broadcast Transmission

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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.
7. Operating mode
There are four operating modes, if low power consumption is not required, for normal communication it is recommended to
configure the data transceiver to the normal mode (mode 0);
The factory default is normal mode (mode 0).
Categories
M1
M0
Notes
Mode 0
Normal Mode
ON
ON
Open UART Comm port and RF，transparent transmission is on,
configuration over air via special command is available.
Mode 1
WOR Mode
ON
OFF
Can be defined as WOR transmitter and WOR receiver，WOR is
available.
Mode 2
Configuration
Mode
OFF
ON
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.
Mode 3
Sleep Mode
OFF
OFF
DTU is in sleep mode.

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7.1. Normal mode（Mode 0）
M0 = ON，M1 = ON，device works in Mode 0
Transmitting
Users send data via UART. The device will start wireless transmission.
Receiving
Wireless receiving is enabled, data received will be output via pin TXD.
7.2. WOR mode（Mode 1）
M0 = OFF，M1 = ON，device works in Mode 1
Transmitting
As a transmitter, a certain preamble code will be added before each transmission.
Receiving
Wireless receiving is enabled, its function is same as Mode 0.
7.3. Configuration mode（Mode 2）
M0 = ON，M1 = OFF，device works in Mode 2
Transmitting
Wireless transmission is off.
Receiving
Wireless receiving is off.
Configuration
Users can visit register to configure the working status.
7.4. Sleep mode（Mode 3）
M0 = OFF，M1 = OFF，device works in Mode 3
Transmitting
Wireless transmission is unavailable.
Receiving
Wireless receiving is unavailable.
Note
When entering other modes from the sleep mode, the parameters will be reconfigured. During the configuration process, AUX
remains low level;
After the configuration, it outputs high level, it is recommended that users detect the rising edge T_BUSY.

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8. Register read and write control
8.1. Command format
In configuration mode（mode 2：M1=OFF，M0=ON），supported commands are as follows（only 9600，8N1 are available）：
NO.
Command format
Description
1
Configure register
command：C0+start address+length+parameter
Reply：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
Reply：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
Configure temporary
register
Command：C2 +start address+length+parameter
Reply：C1 +start address+length+parameter
Example 1：Set channel as 0x09
command start address length parameter
Transmit：C2 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：C2 00 04 12 34 00 61
Return：C1 00 04 12 34 00 61
5
Wireless
configuration
Command：CF CF + general command
Reply：CF CF + general response
Example 1：set channel as 0x09
wireless command head command start address length parameter
Transmit：CF CF C0 05 01 09
Return：CF CF C1 05 01 09
Example 2：set module address（0x1234）, network address(0x00), UART(9600 8N1), air data rate(1.2K)
Transmit：CF CF C0 00 04 12 34 00 61
Return：CF CF C1 00 04 12 34 00 61
6
Format error
Reply: FF FF FF

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8.2. Register description
Address
Read/W
rite
Name
Description
Remark
00H
Read/W
rite
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/W
rite
ADDL
ADDL（Default 0）
02H
Read/W
rite
NETID
NETID（Default 0）
Network address, used to distinguish the
network. When communicating with each
other, they should be set to the same.
03H
Read/W
rite
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/W
rite
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）
-----------------------------------------------
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
Returns: C1 + address address + read length + read
valid value
E.g: send C0 C1 C2 C3 00 01
Return C1 00 01 rssi
-------------------------------------

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4，3，2 remain
-----------------------------------------------
1，0：TX power
00：30dbm（Default）
01：27dbm
10：24dbm
11：21dbm
--------------------------------------
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.
05H
Read/W
rite
REG2
Channel （CH）
0-80 stands for 81 channel respectively
Actual frequency= 850.125 + CH *1M
06H
Read/W
rite
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（listen 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, (see details about WOR time below)
to save power.
-----------------------------------------------
2，1，0，WOR time
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.
-------------------------------------
Only valid in Mode 1.
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.
--------------------------------------
Only valid in Mode 1.
Time 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.
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

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8.3. Factory default parameter
Default parameter：62 00 00 00 00 00
Model NO.
Frequency
Address
Channel
Air data rate
Baud rate
Parity bit
TX power
E90-DTU(900SL30)
868.125MHz
0x0000
0x17
2.4kbps
9600
8N1
30dbm
9. Repeater networking mode
No.
Description
1
After setting the repeater mode by configuration, switch to the normal 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 repeater mode, the repeater module cannot transmit and receive data, and cannot perform low-power operation.
4
The user enters the other mode from mode 3 (sleep mode) or during the reset process, the module resets the user
parameters during which the AUX outputs low level.
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, and it is used as a NETID forwarding pairing flag.
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.

Chengdu Ebyte Electronic Technology Co., Ltd. E90-DTU（900SL30）User Manual
Copyright©2012–2021,Chengdu Ebyte Electronic Technology Co., Ltd.
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10. Configuration instructions on computer
The following figure shows the E90-DTU SL configuration interface on computer, users can switch to the command mode
through M0M1, 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 ; Frequency channel: 0-83
Network ID: 0-255 ; Key: 0-65535
When the user configures 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.