Ebyte E32-DTU User manual

E32-DTU (433NW20)

Chengdu Ebyte Electronic Technology Co,;Ltd E32-DTU (433NW20) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 1
Content
1.Introduction............................................................................................................................................2
1.1. Brief Introduction.................................................................................................................2
1.2. Features...............................................................................................................................2
2. Operation...........................................................................................................................................3
3. Installation Specifications ....................................................................................................................5
3.1. Structure..............................................................................................................................5
3.2. Dimension ...........................................................................................................................7
4. Interface Defination ............................................................................................................................8
4.1. Power interface definition ......................................................................................................8
4.2. RS232 Interface definition .....................................................................................................8
4.3. RS485 Interface definition .....................................................................................................8
5. Technical indicators ............................................................................................................................9
5.1. Model specifications .............................................................................................................9
5.2. General specification parameters.............................................................................................9
5.3. Frequency range and channels .............................................................................................. 10
5.4. Transmit power level........................................................................................................... 10
5.5. Air data rate....................................................................................................................... 10
5.6. Current parameters.............................................................................................................. 10
5.7. Transceiver Length and Sub-packing Mode.............................................................................11
6. Operating mode.................................................................................................................................11
7 Command format................................................................................................................................ 12
7.1 Default parameters....................................................................................................................... 12
7.2 Reading operating parameters ....................................................................................................... 12
7.3 Reading version number............................................................................................................... 13
7.4 Reset command........................................................................................................................... 13
7.5 Parameter setting command.......................................................................................................... 13
8.Connection diagram when programming .................................................................................................. 16
8.1.Diagrammatic drawing................................................................................................................. 16
8.2. Parameter setting instruction ........................................................................................................ 17
7. Connection diagram in test and application .......................................................................................... 18
8. Practical application.......................................................................................................................... 18
11.Note................................................................................................................................................... 19
12.Important statement............................................................................................................................. 20
Revision history....................................................................................................................................... 21
About us................................................................................................................................................ 21

Chengdu Ebyte Electronic Technology Co,;Ltd E32-DTU (433NW20) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 2
1.Introduction
1.1. Brief Introduction
E64-DTU (433NW20) is suitable for low-power, main-multiple slave star networks. Its biggest feature is that it
supports up to 31 slave data to be sent to the host at the same time, and supports WOR working mode of slave, with a
minimum receiving power consumption of about 3mA. Data reliability and correctness are guaranteed by strict data
checking and automatic retransmission mechanism between master and slave.
The E64-DTU ((433NW20) module supports both host and slave modes. In the host mode, the module listens and
receives data from multiple slave machines. In slave mode, the user can set the module to work in WOR mode or send
mode. WOR mode allows the host to initiate data wake-up to the slave, while sending mode only allows the slave to
initiate data to thehost.
The maximum transmission power of E64- (433NW20) module is 100mW, using command transmission mode,
operating at 425~ 451.3mhz. The module USES UART serial port to communicate with user MCU, and its working
voltage range is 8V~28V.
1.2. Features
★All core components are originally imported; our transceiver modems have much advanced functions with smaller size
and lower cost.
★The top TX power is 100mW, all technical parameters meet European industrial standards.
★Temperature compensators are adopted to make the frequency stability better than ±1.5PPM.
★Operation temperature range: -40℃～+85℃, applicable for various harsh environment, it is real industrial grade
products.
★Aluminum alloy case, compact size, great heat dispersion; good shielding, prime electromagnetic compatibility and
strong anti-interference.
★Power reverse & overload protection and antennasurgeprotection functions significantly improve the reliability.
★Parameters can be configured by programming, such as TX power, frequency point, air datarate, address and so on.
★Ultra-low power consumption, standby current is only 14mA (even lower under power-saving and sleep modes), TX
current ≤0.13A.
★Embedded watch-dog and precise time layout, modem will restart automatically upon abnormal situation and work
with previous parameters.
★The transceivers adopt original SEMTECH SX1278 chip, customers highly comment the products because of the
superreliability.

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2. Operation
Main parts
1、First step is to mount antenna, then battery, making sure the dial switch is on its right status. User gets on the power
by choosing either VCC/GND or power adapter.
2、Using USB-(RS232) converter or USB-RS(485) converter or other way to link computer and DTU.

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3、Firing up two XCOMs, choosing Baud rate 9600bps, 8N1, the setting which serial port transmission can be
achieved.
4、User needs to open the mode switch first before link DTU with computer if the user wants to modify parameters.
Firing up E64-DTU 数传电台配置软件 (E64-DTU parameter configuration application) to modify related parameters.
The mode switch must be reopened to achieve transmission after the configuration.
Mode0 Factory Default Mode3 Parameter setting

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3. Installation Specifications
3.1. Structure

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Pin NO.
Name
Function
Description
1
DB-9 female socket
RS-232 interface
Standard RS-232 interface
2
3.81 terminal block
RS-485, powerinterface
Standard RS-485 interface and pressureline
powerinterface
3
PWR-LED
Power LED
Red, lit when the poweris on
4
TXD-LED
Transmit LED
Yellow, blinks when sending data
5
RXD-LED
Receive LED
Yellow, blinks when receiving data
6
DC powerinterface
Power interface
In-line round hole, outerdiameter 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. Dimension
单位：mm

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4. Interface Defination
4.1. Power interface definition
Users can choose ⑥DC power interface, using the power adapter supply with the interface of the 5.5mm outer
diameter , 2.5mm diameter ;
Also choose theVCC and GND terminal power supply, only choose any one of the power supplies is OK;
E32-DTU can use8~ 28V DC power supply, but it is recommended to use 12V or 24V DC power supply.
4.2. RS232 Interface definition
The E64-DTU can be connected to the device via RS-232 using the standard DB-9 interface.
4.3. RS485 Interface definition
E64-DTU can connect the485_A terminal and 485_B terminal with the device RS-485 A terminal and B terminal.
Pin NO.
Definition
Function
Description
1
VCC
Crimping powerinterface, positive
8 ~ 28V DC, recommended 12V or 24V
2
GND
Crimping powerinterface, negative
The powersupply negativepole is connected tothe 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

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4
485_A
RS-485 interface, interface A
The RS-485 interface A is connected to thedevice 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 indicators
5.1. Model specifications
Model
Frequency
Transmit
power
Distance
Specifications
Application
Hz
W
km
E64-DTU
(433NW20)
433
0.1
1.5
One master,
multiple slave, star
networking
Low speedand high reliability wireless
upgrade
★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 parameters
NO.
Model
Specification
Description
1
Size（H*W*D）
82 * 62 * 25 mm
See more at 3.2 Dimension
2
Weight
131g
Tolerance: 4.5g
3
Temperature
-40℃～85℃
Meet industrial level
4
Antenna impedance
50 Ω
Standard 50 Ω characteristic impedance
5
Supply voltage
+10 ~ +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 to 115200 bps
8
Address
Default 0
65536 configurable addresses

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5.3. Frequency range and channels
Model
Default frequency
Frequency range
Channel
spacing
Channels
Hz
Hz
Hz
E64-DTU
(433NW20)
433
425~451.3
100
256，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 thechannel spacing between each group of datatransceivers at 2MHz or more.
5.4. Transmit power level
Mode
10mW
25mW
50mW
100mW
E64-DTU (433NW20)
√
√
√
√
★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 usethe maximum transmit power.
5.5. Air data rate
Model
Default air data
rate
Levels
Air data rate(bps)
bps
bps
E64-DTU (433NW20)
8
4
2、5、8、20
★Note: The higher the air data rate, the faster the transmission rate, the transmission distance is also closer; when the
rate meets therequirements, the lower air data rate, thebetter quality.
5.6. Current parameters
Model
Transmitting current mA
Standby current mA
12V
24V
12V
24V
E64-DTU (433NW20)
109
69
24
19
★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.

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5.7. Transceiver Length and Sub-packing Mode
Model
Buffer
Sub-package
E64-DTU (433NW20)
512Byte
Automatically send 55 bytes perpackage
★Note:
1. If the data received by the station in a single time is larger than the capacity of a single packet, the excess data
will be automatically allocated to the second transmission until the completion of transmission.
2. The data transceiver cannot receive datawhich is more than the buffer capacity;
6. Operating mode
E64-DTU (433NW20) has four operating modes, if low power consumption is not required, normal communication is
recommended to configure the datatransceiver for the normal mode (mode 0);
The factory default is normal mode (mode 0).
Categories
M1
M0
Description
Mode0
MasterMode
ON
ON
Listen for all numbered slave data in the same channel. If theslave
WOR is turned on, theslave can be awakened
Mode1
Slave sending Mode
ON
OFF
The module sends the data to the Master
Mode2
Slave receiving Mode
OFF
ON
OpenWOR to wait for host data
Mode3
Sleep Mode
OFF
OFF
Parameter settingusing theconfiguration software
★Note: no need to care about the wake-up mode (mode 1) and power saving mode (mode 2) if it doesn’t reques t low
power consumption.

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7 Command format
In sleep mode（Mode 3：M1=off, M0=off）, it supports belowinstructions on list.
(Only support9600 and 8N1 format when setting)
No.
Instruction
format
Illustration
1
C0+working
parameters
C0 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in total and
must be sent in succession, ( Save the parameterswhen power-down ).
2
C1+C1+C1
Hexadecimal format sends three C1, the module returns saved parameters, must be sent
continuously.
3
C2+working
parameters
Send C2+5 bytes in hexadecimal format: 6 bytes of working parameters, must be sent
continuously (poweroff without saving)
4
C3+C3+C3
Hexadecimal format sent three C3, the module return version information, must be sent
continuously.
5
C4+C4+C4
Hexadecimal format sent three C4, the module will produce a reset, must be sent
continuously.
7.1 Default parameters
Type
Defaultparametervalues：C000 00 1C 20 64
Model
The
network
number
Slave
address
Air data rate
Baud rate
Parity
Transmitting
Power
FEC
E64-DTU (433NW20)
0x00
0x00
8kbps
9600
8N1
100mW
on
7.2 Reading operating parameters
Instruction format
Description
C1+C1+C1
In sleep mode（M0=1，M1=1），
User gives the module instruction(HEX format): C1 C1 C1,
Modulereturns thepresent configuration parameters.
For example, C0 00 00 1C 20 64.

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7.3 Reading version number
Instruction format
Description
C3+C3+C3
In the sleep mode (M0=1, M1=1),
The user issuesa command tothe module serial port (HEXformat) : C3, C3,
The module returns the current configuration parameters, such as C3 64 xx yy.
Here, 64 refers to the module model (E64 series), xx is the version number, and yy refers to
other features of themodule.
7.4 Reset command
Instruction format
Description
C4+C4+C4
In sleep mode, the user issues a command to the module serial port (HEX format) : C4, C4,
C4, and the module will generate a reset.
Duringthe reset process, the module conducted self-inspection and AUX output low level.
After the reset, AUX output high level and the module began to work normally. At this
point,you can switch modes or issue the next instruction.
7.5 Parameter setting command
Working parameters can be C0 or C2 command, the difference is: the C0 command will write parameters to the module
FLASH, power down save.
C2 command is a temporary modification instruction, and the parameters will not be power-off to save, which is suitable
for the occasion of frequent modification of working parameters. For example: C0 00 00 18 03 44.
No.
Item
Description
Remark
0
HEAD
Fix 0xC0 or 0xC2 to indicate that this frame data is a
control command
It must be 0xC0 or C2
C0: the parameters set will be saved
after powerfailure.
C2: the parameters set will not be
saved after poweroff
1
NC
Reserved
2
NC
Reserved

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3
SPED
Rate parameters, including serial speed and air speed
7,6: serial port check bit
00:8 N1 (default)
01:8 O1
10:8 E1
11:8 N1 (equivalent to00)
---------------------------------------------
5,4,3 TTLserial port rate (BPS)
000: serial port baud rate is 1200
001: serial port baud rate is 2400
010: serial port baud rate is 4800
011: serial port baud rate is 9600 (default)
100: the serial port baud rate is 19200
101: the serial port baud rate is 38,400
110: serial port baud rate is 57600
111:the serial port baud rate is 115200
---------------------------------------------
2,1,0 wireless air rate (BPS)
000: reserved
001: air speed2k
010: air speed5k
011: air speedis 8k (default)
100: Reserved
101: Reserved
110: air speedis 20k
111:Reserved
通信双方串口模式可以不同
The serial port modes of
communication parties can be
different
-------------------------------------
The baud rates of thetwo
communicating parties can be
different
The serial port baudrate has
nothing to do withthe wireless
transmission parametersand
does not affect the wireless
transceiver characteristics.
-------------------------------------
The lower the air speed, thefarther
the distance, the stronger the
anti-interference performance and
the longer the transmission time.
Bothsides of the communication air
wireless transmission rate must be
the same
4
CHAN
Networkgroup no. 00-07h
000: group 0
001: group 1 (default)
010: group 2
011: group 3
100: group 4
Group 5:101
Group 110: group 6
111:group 7
---------------------------------------------
Address of slave machine 00-1eh (default 0)
No network with the same
number can exist in the same
region
Devices on different networks
cannot communicate
Only one host can exist in the
same network
-------------------------------------
Support 31slave Numbers
No slave with duplicate
Numbers in the same network
This parameter is not valid for
the host
5
OPTION
7 Reserved
---------------------------------------------
6 IO driver mode (default 1)
1: TXD,AUX push pulloutput, RXD pull
input 0: TXD,AUX openoutput, RXD openinput
---------------------------------------------
5,4,3 WOR wireless wake up time (for thereceiver, is
the listening interval; For thetransmitter,it'sthe time it
takes to keep firing the wakeup codes.)
000：0ms
001：250ms
010：500ms
011：750ms
100：1000ms （Default）
101：1250ms
110：1500ms
-------------------------------------
This bit is used to enable the
pull-up resistance inside the
module. Thedrain opencircuit
level is more adaptable, but in
some cases external pull-up
resistance may be required
----------------------------------
The wake up time set by the
host module cannot be less
than thelistening interval from
the module, otherwisethe data
may be lost
The longer the wake-up time,
the lower the average
receiving current.
The host module also
recommends settingthe same
WOR time to wake up the
slave.

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111：2000ms
---------------------------------------------
2. FEC switch
0: close the FEC
1: turn on FEC (default)
---------------------------------------------
1, 0 Transmissionpower(approximate)
00：20dBm（Default）
01：17dBm
10：14dBm
11：11dBm
-------------------------------------
AfterFEC is turned off, the
actual data transmissionrate
will be increased, but the
anti-interference ability will be
weakened and the distance
will be slightly closer. Please
select according tothe actual
application.
Bothsides of the
communication must be on or
off.
-------------------------------------
External powersupply must
provide more than 500mA
current output capacity.And
ensure that the powerrippleis
less than 100mV.
It is not recommended touse a
small powertransmission; its
powerutilization efficiency is
not high.
For example: The meaningof No.3 "SPED" byte:
The binary bit of the
byte
7
6
5
4
3
2
1
0
Configures by user
0
0
0
1
1
0
0
1
Meaning
UART parity bit 8N1
UART baud rate is 9600
Air data rate is 2k
Corresponding
hexadecimal
1
9

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8.Connection diagram when programming
8.1.Diagrammatic drawing
Mode
M1
M0
Description
Mode3
Sleep Mode
Off
Off
The module enters hibernation and can
receive parameter settingcommands
★Note:
1.programming can only be carried on in a specific mode (see above), if fails, please confirm the work mode.

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2.If there’s no complicated programming, opening the E64-DTU数传电台配置软件 (E64-DTU parameter configuration
application) to modify parameters.
8.2. Parameter setting instruction
Parameter
Description
Baud rate
The serial port baudrate of a wireless data stationat work，1200bps～115200bps。
Odd-even check
Support 8N1:no check ；8E1:even-check；8O1:odd-check；Both are 8-bit data bits and 1-bit stop bits.
Air data rate（bps）
Wireless communication rate, also known as air baud rate air rate high, data transmissionspeed,
transmission of thesame data time delay is small, but thetransmission distance will become shorter.
Transmittingpower
In order to ensure the working efficiency, it is recommended to use themaximum power.If the
transmittedpoweris reduced, the communication distance will become shorterand the required current
will be reduced
FEC
The lost or interfered data can be partially corrected by complex encoding, which can improve the
equivalent receiving sensitivity by about 3dBm. Turning off this function can reduce the
communication delay.
Transmission mode
Transparent transmission,and send-as-received fixed points:datais sent at fixed points according to
the format
Wake Up Time
There is no direct relationship withthe communication delay. If thecustomer needs low-power
applications, this optionshall be adjusted as required. In the power-savingmode, thelonger the
wake-up time, thelower thepowerconsumptionof the receiving end, and the greater the
communication delay.

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IO driven
By default, select theinternal TTLsignal drive mode。
Communications
group
A totalof 8 groups of networks are supported,witheach group supportingup to31 slave machines.
Communication between different groups is not possible.
The communication
address
Address of slave machine, each group can support up to31 slave machines, and the address of
communication withineach group cannot be repeated.
Slave transparent
transmission
Whether the slave machine needs to follow the communication protocolor not, transparent
transmission can also be supported.
7. Connection diagram in testand application
ModeNo.
Interface
Frequency Hz
Tx power
dBm
Distance
km
Function feature
E64-DTU (433NW20)
RS232 RS485
433M
20
1.5
One master, multiple slave, star
networking
8. Practicalapplication
The data transceiverof 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 and hydrological forecasting, water pipe network monitoring, urban streetlamps

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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:
11.Note
1. Please keep the warranty card of the equipment which includes the factory number (and important technical
parameters) and is important for user's future maintenance and new equipment.
2. Transceiver during the warranty period, if the quality of the product itself rather than man-made damage or
lightning and other natural disasters caused by damage, enjoys free warranty; please do not repair by yourself, the
problem andplease contactwith our company when problem occurring, we offer the first-class after-sales service.
3. Please do not operate the transceiver in some flammable places such as coal mines or near explosive atmospheres
(such as detonators).
4. Please use the appropriate DC power supply, high frequency interference ability, small ripple, and enough load
capacity are required; it’s better to have over current, over vo ltage protection and lightning protection and other functions
to ensure that transceiver working properly.
5. Please do not use it in the working environment beyond the transceiver environmental characteristics , such as
high temperature, humidity, low temperature, strongelectromagnetic fields or dust larger environment.
6. Please do not continuously keep transceiver to transmit in full capacity, or the transmitter might be damaged.
7. Please connect the ground with the external ground of the power supply (such as PC, PLC, etc.) , otherwise it is