Ebyte E830-DTU(2R2-433L)-V8 User manual

Digital/Switching Wireless data radio
E830-DTU（2R2-433L）-V8

Chengdu Ebyte Electronic Technology Co.,Ltd E830-DTU(2R2-433L)-V8 User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
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including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
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Contents
Disclaimer .......................................................................................................................................................................2
Chapter 1 Product Introduction ......................................................................................................................................2
1.1. Product Introduction .............................................................................................................................. 2
1.2. Functional features .................................................................................................................................2
Chapter 2 Quick Start .....................................................................................................................................................3
2.1 Wiring method of each port ................................................................................................................... 3
2.1.1 Input terminal wiring method ........................................................................................................ 3
2.1.2 Output connection method .............................................................................................................3
2.1.3 RS485 connection method ............................................................................................................. 4
2.2 Follow the features to get started ........................................................................................................... 4
2.3 Get started with the control acquisition function ...................................................................................5
Chapter II Performance Parameters ............................................................................................................................... 6
Chapter III Installation Dimensions ...............................................................................................................................8
Chapter IV Explanations of Ministries .......................................................................................................................... 9
4.1 Reset button description .......................................................................................................................10
4.2 Description of the LEDs ...................................................................................................................... 10
4.3 DIP switch description ......................................................................................................................... 10
Chapter 5 Parameter Configuration ..............................................................................................................................11
Chapter 6: Following the Pattern ................................................................................................................................. 12
6.1 Wireless response speed .......................................................................................................................12
6.2 Wireless channel .................................................................................................................................. 12
6.3 Number of retransmissions .................................................................................................................. 13
Chapter VII: Collection Modes .................................................................................................................................... 14
7.1 The relay is kept all the time ................................................................................................................14
7.2 The relay holds the set time ................................................................................................................. 14
Chapter VIII: ModBus ................................................................................................................................................. 15
8.1 Default factory settings ........................................................................................................................ 15
8.2 Modbus address table ...........................................................................................................................15
8.2.1 Coil read and write instructions ...................................................................................................15
8.2.2 Discrete address table .................................................................................................................. 16
8.2.3 Register address table .................................................................................................................. 17
Chapter IX Precautions for Use ................................................................................................................................... 19
Chapter X Important Statements ..................................................................................................................................19
About us ........................................................................................................................................................................20

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Chapter 1 Product Introduction
1.1. Product Introduction
E830-DTU(2R2-433L)-V8 is a remote control product with switch tracking, control acquisition function, support 2 disconnector
switch inputs and 2 relay outputs, communication interface using RS-485 interface (only for configuration mode); wireless acquisition
function supports standard MODBUS RTU protocol, the product has a high degree of ease of use, can be widely used in industrial
field equipment signal acquisition, monitoring and control.
1.2. Functional features
Support 2-way dry contact switch input;
Support 2 relay outputs;
433MHz frequency wireless data remote transmission;
Digital tracking, control and acquisition functions;
Support 4 working modes: wireless control acquisition, wireless following transmission mode, wireless following receiving
mode, configuration mode, selected by DIP switch;
Data processing using Modbus RTU protocol;
Reset Tap the reset button, press and hold 5s in wireless control acquisition mode, and the Modbus address restores the default
address 01;
Built-in efficient watchdog with high reliability and stability;
3 two-color indicators show working status;
The power supply has good overcurrent, overvoltage, anti-reverse connection and other functions.

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Chapter 2 Quick Start
This chapter is a quick introduction to E830-DTU (2R2-433L)-V8 products, it is recommended that users read this chapter
systematically and follow the instructions to operate again, you will have a systematic understanding of module products, users can
also choose the chapter you are interested in reading according to their needs. For specific details and instructions, please refer to the
subsequent sections.
2.1 Wiring method of each port
2.1.1 Input terminal wiring method
2.1.2 Output connection method

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2.1.3 RS485 connection method
In RS485 communication, attention should be paid to A, B line matching, if the communication is found to be abnormal, add 120R
matching resistor between A and B lines.
2.2 Follow the features to get started
Prepare the two E830-DTUs (2R2-433L)-V8 labeled Device A and Device B respectively, ensure that their parameters are the
same (factory default parameters are enough), configure Device A as the transmitter and Device B as the receiver, and need to power
back on to take effect after changing the mode.
(Note: E830-DTU(2R2-433L) and E830-DTU(2R2-433L)-V8 cannot establish communication and follow function between
the two.) The following function can only be implemented between E830-DTU(2R2-433L)-V8. )
Device A transmitter: M1M0=10
Device B receiver: M1M0=01

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The input channel 1 of device A changes, while the blue light of D1 is on, the corresponding action of relay 1 of device B, and the
green light of D1 is on;
The input channel 2 of device A changes, while the blue light of D2 is on, the relay 2 of device B acts accordingly, and the green
light of D2 is on;
In follow mode, only the relay at the receiving end has an input at the transmitter end, and the relay at the transmitter does not
operate.
2.3 Get started with the control acquisition function
Prepare an E830-DTU (2R2-433L)-V8 device and an E90-DTU radio, the device wireless communication using the Modbus RTU
protocol, see the register table below to set E90-DTU (433L30)-V8 / E90-DTU (433L20)-V8The wireless parameters of the radio
are configured to be consistent with those of the E830-DTU(2R2-433L)-V8 device; the working mode of the
E830-DTU(2R2-433L)-V8 device is configured through the DIP switch.
E90-DTU mode: M1M0=00

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E830-DTU acquisition control mode: M1M0=11, after changing the mode, it needs to be powered back on to take effect.
In the acquisition mode, for example, the E90-DTU radio can read the input of the E830-DTU (2R2-433L)-V8 device through the
command 01 02 00 00 00 00 02 F9 CB, when the 2 channels have input and 1 channel has no input, the data value 01 02 01 02 20 49
will be returned, and the blue light of D2 will be on.
In control mode, for example, the E90-DTU radio can control the output of relay 2 of the E830-DTU (2R2-433L)-V8 device by
command 01 05 00 00 00 FF 00 8C 3A, and the output of relay 1 is disconnected, and the data value will be returned as 01 05 00 00
FF 00 8C 3A, and the green light of D2 will be on.
Chapter II Performance Parameters
type
project
index

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Wireless parameters
Factory default frequency
426MHz
Transmit power
1W
Hardware parameters
Product size(H*W*D)
124*105*25
Product weight
130g±5g
Operating temperature
-40℃～+70℃
Storage temperature
-40℃～+85℃
Operating humidity
5%～95%
Storage humidity
1%～95%
Operating voltage
8~28V
The relay outputs electrical
parameters
Supports 5A 30VDC or 5A 250VAC
Data interface (3.81 terminal block)
RS485:9600bps
Software parameters
Working mode
Follow the launch pattern
Follow the receive pattern
Control acquisition
Configuration mode
Configure the command
Modbus RTU

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Chapter III Installation Dimensions

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Chapter IV Explanations of Ministries
serial
numb
er
Standard
definitions
function
illustrate
1
DI1
Switching input
channel 1
Switching acquisition 1 channel, optocoupler isolation
2
COM1
Switching input
channel 1
The common end of input channel 1 is internally connected to the module
ground
3
DI2
Switching input
channel 2
Switching acquisition 2 channels, optocoupler isolation
4
COM2
Switching input
channel 2
The common side of input channel 2 is internally connected to the module
ground
5
RESET
Reset button
In acquisition mode, you can press and hold the button 5s to reset the Modbus
address to the default address 01
6
485_A
RS-485 interface A
RS-485 interface A is connected to device A interface and is used only for
configuration parameters
7
485_B
RS-485 interface B
RS-485 interface B is connected to device B interface and is used only for
configuration parameters
8
GND
Crimp power supply
input negative terminal
Power supply reference ground
9
VCC
Crimp power input
positive
Power input, range: DC8~28V, recommended 12V, 24V

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10
PWR/ACK
Power/ACK LED
Two-color light, blue light for power indicator, power on solid on, green light
for ACK indicator
11
D1
Input/output indicators
Two-color light, blue light when DI1 has input signal, green light when relay 1
has action
12
D2
Input/output indicators
Two-color light, blue light when DI2 has input signal, green light when relay 2
has action
13
ON
Wireless module
antenna interface
433M antenna interface
14
M1
DIP switch 1
M0/M1 dialing codes determine the operating mode
15
M0
DIP switch 0
M0/M1 dialing codes determine the operating mode
16
COM2
Relay output channel 2
Relay 2 outputs the common terminal
17
NO2
Relay output channel 2
Relay 2 output normally open
18
COM1
Relay output channel 1
Relay 1 outputs the common terminal
19
NO1
Relay output channel 1
Relay 1 output normally open
4.1 Reset button description
Long press 5S is effective, and after successful reset, three green indicators will flash at the same time.
Note: Only in the acquisition control mode can take effect, and only reset the address of Modbus is 0x01H, other parameters will not
reset, to restore the default factory settings, please use the host computer to configure.
4.2 Description of the LEDs
PWR/ACK: Power/ACK indicator
When the DTU is powered on, the power light is always on, which is blue; only when the transmitter receives the ACK returned by the
receiver, this two-color indicator light will change from blue to purple and then back to blue, and when the color of the indicator
changes, it means that the transmitter receives the ACK of the receiver
D1: Input/output indicator
Two-color light, blue light when DI1 has input signal, green light when relay 1 has action
D2: Input/output indicator
Two-color light, blue light when DI2 has input signal, green light when relay 2 has action
4.3 DIP switch description
The working mode is established by means of a DIP switch (the state of M1M0, down to "ON");

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Note: The mode switch must be powered back on to take effect.
mode
Pattern category
M1
M0
exegesis
Mode 0
Control the acquisition
mode
1
1
Wireless control of the acquisition function
Mode 1
Follow the launch
pattern
1
0
When following the function, the transmitter
Mode 2
Follow the receive
pattern
0
1
When following the function, the receiving
end
Mode 3
Configuration mode
0
0
Used to configure wireless parameters and
Modbus related parameters
Chapter 5 Parameter Configuration
Configuration mode (M1M0=00), parameters can be configured through the host computer:
Device address: is the current Modbus address of DTU, the range is 0-248, the smaller the value, the faster the computer search
speed, the larger the value, the slower the search speed;When the address is changed by the host computer, the address must be
searched again for other parameters to take effect.

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Chapter 6: Following the Pattern
6.1 Wireless response speed
It is the time when the data is input from the input port and then transmitted through the wireless module to the relay action of the
DTU output at the other end;
There are 5 levels in total, the smaller the time, the faster the speed, the smaller the delay, and the closer the distance.
E830-DTU wireless response time code value table
The E90-DTU corresponds to the air rate
1
320ms
1200bps
2
200ms
2400bps (factory default)
3
120ms (factory default).
4800bps
4
100ms
9600bps
5
80ms
19200bps
6.2 Wireless channel
The frequency of DTU wireless communication, a total of 0~31 channels, the corresponding frequency point is as follows:

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E830-DTU wireless channel code value table
E90-DTU corresponds to frequency channel and module address
Corresponding frequency
Corresponds to the
channel
Corresponds to the channel
Corresponding address
410MHz
0
0
0
411MHz
1
1
1
412MHz
2
2
2
439MHz
29
29
29
440MHz
30
30
30
441MHz
31
31
31
E90-DTU address translation method：Populate the channel in the E830 with the address and channel in the E90。For example:
The E830 channel is 31, then the E90 parameter sets the channel to 31, and the address is set to 31, as shown below:
6.3 Number of retransmissions
When the DTU receiver does not receive data in the following mode, the transmitter will resend the number of times the data is sent,
which avoids data packet loss, but the more times it is retransmitted, the longer the transmission time will be; the actual number of
transmissions = the number of retransmissions + 1; the range is from 0~10 times, and the default is 2 times.

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Chapter VII: Collection Modes
7.1 The relay is kept all the time
In the acquisition mode, the control state of the relay is always maintained, and the default is that the relay is always maintained.
7.2 The relay holds the set time
It is in the acquisition mode that the control state of the relay is maintained for a certain time, and the holding time can be defined by
itself;
Note: Relay hold time (S) valid values are integers, decimals are invalid;
When the relay control state is 0, its relay is always held, and the relay hold time cannot be set;The relay hold time can only be set
when the relay control state is 1.

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Chapter VIII: ModBus
8.1 Default factory settings
Wireless channel
Modbus address
Response time
Number of
retransmissions
Relay control status
16
01
0.12s
2
0
Note: When the wireless channel is 16, the DTU operating frequency is 426MHz.
8.2 Modbus address table
8.2.1 Coil read and write instructions
Coil address table (function codes: 0x01H, 0x05H, 0x0FH)
address
parameter
Read/Write
minimum
maximum
illustrate
00001
NO1
Read/Write
0x0000
0xFF00
Status of read/write relay 1
00002
NO2
Read/Write
0x0000
0xFF00
Status of read/write relay 2
Note: When sending the modbus command, the address in the table needs to be subtracted by one.
Example 1: Use the 01 function code to read the output status of the coil, for example, read the output port NO1, NO2 command as
follows:
01
01
00 00
00 02
bd cb
Device ModBus
address
Function code
Start address
Number of coils
CRC checksum
Return data value:
01
01
01
02
D0 49
Device ModBus
address
Function code
Data length
Coil value
CRC checksum
Send command: 01 01 00 00 00 02 bd cb
Return data: 01 01 01 02 D0 49
In the return value, the coil value is 02, corresponding to the binary bit 0000 0010, 1 represents the relay output closed, 0 represents
the relay output disconnected. bit0 is 0, which means that the relay output NO1 is disconnected; bit1 is 1, which means that the relay
output NO2 is closed.
Example 2: Use the 05 function code to write an output coil, for example, let the N01 relay output close, and send the following

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command:
01
05
00 00
FF 00
8C 3A
Device ModBus
address
Function code
address
Write the value
CRC checksum
Return data value:
01
05
00 00
FF 00
8C 3A
Device ModBus
address
Function code
address
Write the value
CRC checksum
Send instructions: 01 05 00 00 FF 00 8C 3A
Return data: 01 05 00 00 FF 00 8C 3A
In the send instruction, the write value FF 00 represents ON, i.e. the relay is closed, and the write value of 00 00 represents OFF, i.e.
the relay is off.
Example 3: Use the 0F function code to write two output coils, for example, let the N02 relay output close, N01 relay output
disconnect, send the command as follows:
01
0F
00 00
00 02
01
02
5F 56
Device ModBus
address
Function code
Start address
Number of coils
Data length
Write the value
CRC checksum
Return data value:
01
0F
00 00
00 02
D4 0A
Device ModBus
address
Function code
Start address
Number of coils
CRC checksum
Send command: 01 0F 00 00 00 02 01 02 5F 56
Return data: 01 0F 00 00 00 02 D4 0A
In the sending instruction, write the value 02, corresponding to binary 0000 0010, bit0 is 0, representing OFF, that is, relay N01 is
disconnected; bit1 is 1, representing ON, that is, relay N02 is closed.
8.2.2 Discrete address table
Discrete address table (function code: 0x02H)
address
parameter
Read/Write
minimum
maximum
illustrate
10001
D AND 1
read only
0
1
Read the status of digital input channel 1
10002
D and 2
read only
0
1
Read the status of digital input channel 2

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Note: When sending the modbus command, the address in the table needs to be subtracted by one;
Example 1: Use the 02 function code to read discrete inputs, such as reading DI2 and DI1 switching inputs, and send the following
command:
01
02
00 00
00 02
F9 CB
Device ModBus
address
Function code
Start address
Number of coils
CRC checksum
Return data value:
01
02
01
02
20 49
Device ModBus
address
Function code
Data length
Enter the status
CRC checksum
Send instructions: 01 02 00 00 00 02 F9 CB
Return data: 01 02 01 02 20 49
In the returned data, the input state is 02, corresponding to binary 0000 0010, bit0 is 0, representing disconnected, that is, the switch
input DI1 is the open state; bit1 is 1, representing closed, that is, the switching input DI2 is closed.
8.2.3 Register address table
Register address table (function codes: 0x03H, 0x06H, 0x10H)
40033
ModBus address
2
Read/Wr
ite
0
248
address
40034
Relay control status
settings
2
Read/Wr
ite
0
1
0 (default), the relay is always maintained;
1. The relay keeps the set duration.
40035
Relay hold time setting
2
Read/Wr
ite
1
1000
Valid when the relay status is 1, default 5S
40036
Number of retransmissions
2
Read/Wr
ite
0
10
Default 2 times
40037
Wireless channel
2
Read/Wr
ite
0
31
Wireless communication channel
40038
Wireless response time
2
Read/Wr
ite
0
4
Default 2, see Wireless Response Time for
details
40039
Device version
information
2
read
0
65535
Device version information
Note:
1. When sending the modbus command, the address in the table needs to be subtracted by one;
2. The 40034, 40035 register setting values are only valid in the control acquisition mode, and the 40036 register setting values are
only valid in the follow mode;
3.40039 register read-only, so only 03H function code is supported, 06H, 10H function code is not supported.

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Example 1.Use the 03 function code to read the register value, such as reading the Modbus address register, the command is as
follows:
01
03
00 20
00 01
85 C0
Device ModBus
address
Function code
Read register start address
Read register length
CRC checksum
Return data value:
01
03
02
00 01
79 84
Device ModBus
address
Function code
Read returns the number of
bytes
Register value
CRC checksum
Send instructions: 01 03 00 20 00 01 85 c0
Return data: 01 03 02 00 01 79 84
The return register value is 00 01, which means that the device address is 1.
Example 2.Use the 06 function code to write a register, for example, the value of the write and resend times register is 5 times, the
command is as follows:
01
06
00 23
00 05
B8 03
Device ModBus
address
Function code
Write the register address
Write register values
CRC checksum
Return data value:
01
06
00 23
00 05
B8 03
Device ModBus
address
Function code
Write the register address
Write register values
CRC checksum
Send instructions: 01 06 00 23 00 05 B8 03
Return data: 01 06 00 23 00 05 B8 03
In the send instruction, the write register value is 00 05, and the write value of the register representing the number of retransmissions
is 5.
Example 3.Use the 10 function code to write multiple registers, for example, set the resend number register value to 8 and the wireless
channel register set to 16:
01
10
00 23
00 02
04
00 08 00 10
31 AM
Device ModBus
address
Write
commands
Start address
Number of write
registers
Number of bytes
written
Write register
values
CRC
checksum
Return data value: