Ebyte 230SL37 User manual

E90-DTU(230SL37)
New LoRa, long Distance, High Power

Chengdu Ebyte Electronic Technology Co., Ltd. E90-DTU SL User Manual
Copyright2012–20231ChengduEbyteElectronicTechnologyCo,;Ltd
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Contents
1. Introduction ................................................................................................................................................................ 3
1.1 Brief introduction ............................................................................................................................................. 3
1.2 Certificate ......................................................................................................................................................... 3
1.3 Features .............................................................................................................................................................3
2. Quick Start ..................................................................................................................................................................4
3. Dimensions ................................................................................................................................................................. 6
3.1 Parts description ............................................................................................................................................... 6
3.2 Dimensions ....................................................................................................................................................... 7
4. Interface definition ..................................................................................................................................................... 9
4.1 Power interface .................................................................................................................................................9
4.2 RS232 ............................................................................................................................................................... 9
4.3 RS485 ............................................................................................................................................................... 9
5. Technical specification ............................................................................................................................................. 10
5.1 Model specification ........................................................................................................................................ 10
5.2 General specification parameter .....................................................................................................................10
5.3 Frequency and channel numbers ....................................................................................................................10
5.4 Air data rate .................................................................................................................................................... 11
5.5 Current ............................................................................................................................................................ 11
5.6 TX and RX FIFO and sub-packing method ................................................................................................... 11
6. Function Description ................................................................................................................................................ 12
6.1 Fixed Transmission .........................................................................................................................................12
6.3 Broadcast Address .......................................................................................................................................... 12
6.4 Monitor Address ............................................................................................................................................. 13
7. Operating mode ........................................................................................................................................................ 13
7.1 Normal mode（mode 0）..............................................................................................................................13
7.2 Configuration mode (mode 2) ........................................................................................................................14
8. Register read and write control ................................................................................................................................ 14
8.1 Command format ............................................................................................................................................14
8.2 Register description ........................................................................................................................................15
8.3 Factory default parameter ...............................................................................................................................18
9. Repeater networking mode .......................................................................................................................................18
10. Configuration instructions on computer .................................................................................................................19
11. Programming the modem ....................................................................................................................................... 21
11.1 Connection diagram ......................................................................................................................................21
12. Connection diagram in test and practical application ............................................................................................ 22
13. E90-DTU ................................................................................................................................................................ 22
14. Application field ..................................................................................................................................................... 23
15. Operation notes .......................................................................................................................................................24
Important statement ...................................................................................................................................................... 24
Revision history ............................................................................................................................................................25
About us ........................................................................................................................................................................25

Chengdu Ebyte Electronic Technology Co., Ltd. E90-DTU SL User Manual
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1. Introduction
1.1 Brief introduction
E90-DTU (230SL30) is a data transceiver with military-grade LoRa modulation technology. With multiple
transmission modes, it works in the (220.125MHz~236.125MHz) frequency band (default 230.125MHz). 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.
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-DTUis 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.
1.3 Features
Using the latest LoRa technology, it is farther away from traditional LoRa digital radio stations and has more powerful
performance.
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.
Support data transfer rates from 0.3k to 15.6kbps.

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Support the 230MHz power band, the penetration diffraction capability is stronger than 433MHz.
Simple and efficient power supply design, support power adapter or crimping mode, support 8～28V power supply.
The transmission power can be up to 5W.
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 wireless send command packets, remotely configure or read wireless module parameters.
Support communication key function to effectively prevent data from being intercepted.
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.
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.
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.

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Mode 0 Factory default Mode 2 Parameter configuration
3. Dimensions
3.1 Parts description

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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
3.2 Dimensions

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unit：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

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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.
5. Technical specification
5.1 Model specification
Model No.
Frequency
TX
power
Distance
Features
Recommended application
Hz
W
km
E90-DTU(230SL3
7)
230.125M
5
20
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
124 * 105 * 25 mm
See more in 3.2. Dimensions
2
Weight
239.7g
± 9g
3
Temperature
-40℃～85℃
Meet industrial request
4
Antenna impedance
50Ω
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(230SL37)
230.125M
220.125～236.125M
250K
65，half duplex

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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.
5.4 Air data rate
Model
Default
Levels
Air data rate (bps)
bps
bps
E90-DTU(230SL37)
2.4k
8
2.4、2.4、2.4、2.4、4.8、9.6、15.6k
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.
5.5 Current
Model
TX current mA
Standby current mA
12V
24V
12V
24V
E90-DTU(230SL37)
1200
600
50
27
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.
5.6 TX and RX FIFO and sub-packing method
Model No.
Buffer
Sub-packing method
E90-DTU(230SL37)
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
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.

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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
The E90-DTU (230SL30) has two working modes. In normal communication, the radio is configured in the normal
mode (mode 0); the default setting of the radio is also the 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
Reserved
mode
ON
OFF
Reserved, no special features
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
Reserved
mode
OFF
OFF
Reserved, no special features
7.1 Normal mode（mode 0）
Type
When M0 = ON and M1 = ON, the module 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.

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7.2 Configuration mode (mode 2)
Type
When M0 = ON and M1 = ON, the module works in mode 2.
Transmitting
Wireless transmission is off.
Receiving
Wireless receiving is off.
Configuration
Users can visit register to configure the working status.
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

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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
configuratio
n
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
8.2 Register description
Add
ress
Read/W
rite
Name
Description
Remark
00H
Read/Wri
te
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/Wri
te
ADDL
ADDL（Default 0）
02H
Read/Wri
te
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/Wri
te
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 2.4k
001：air data rate is 2.4k
010 ：air data rate is 2.4k
（Default）
011：air data rate is 2.4k
100：air data rate is 4.8k
101：air data rate is 9.6k
110：air data rate is 15.6k
111：air data rate is 15.6k
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/Wri
te
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 remain
-----------------------------------------------
1，0：TX power
00：37dbm（Default）
01：37dbm
10：37dbm
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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11：37dbm
-------------------------------------
--------------------------------------
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/Wri
te
REG2
Channel （CH）
0-64 stands for 65 channel respectively
Actual frequency= 410.125 + CH
*1M
06H
Read/Wri
te
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
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 ，

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110：3500ms
111：4000ms
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
~
86
H
Read
only
PID
7 bytes of product information
product information: 7 bytes
8.3 Factory default parameter
Default parameter：0x00 0x00 0x00 0x63 0x00 0x28 0x03 0x00 0x00
Model NO.
Frequency
Address
Channel
Air data rate
Baud rate
Parity bit
TX
power
E90-DTU
(230SL37)
230.125MHz
0x0000
0x28
2.4kbps
9600
8N1
37dbm
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.
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.

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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.
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.

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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.