Ebyte E831-RTU Series User manual

Wireless Data Transceiver
E831-RTU(4040R-485)
User Manuel
This manual may change as the product continues to improve, please refer to the latest version of the manual
All rights to interpret and modify this Manual belong to Chengdu Ebyte Electronic Technology Co., Ltd

Content
Functional features..............................................................................................................................3
1. Quick start................................................................................................................................... 3
1.1. Port connection............................................................................................................... 4
1.2. Simple use....................................................................................................................... 5
2. Product introduction....................................................................................................................7
2.1. Basic parameters............................................................................................................. 7
2.2. Size, Interface description...............................................................................................8
2.3. Command reset description.......................................................................................... 10
3. Modbus......................................................................................................................................11
3.1. Modbus Address table...................................................................................................11
3.2. Modbus Address table...................................................................................................12
3.3. RS485 Serial port baud rate code value table...............................................................12
3.4. RS485 Serial port parity digit code value table............................................................12
3.5. Configure parameters through host.............................................................................. 13
4. Product features.........................................................................................................................13
4.1. Mode selection.............................................................................................................. 13
4.2. IO Basic function.......................................................................................................... 14
4.3. IO Features....................................................................................................................16
Revision history................................................................................................................................ 18
About us............................................................................................................................................ 19

Functional features
Support 4 digital isolated inputs, default dry contact;
Support 4 rely relay outputs, support 3A 30VDC, 3A 250VAC;
Modbus RTU protocol data processing;
Support command reset. After sending AT + RESTORE \ r \ n commandto 485 serial port within
3s after power-on, Modbus device address, RS485 serial port baud rateand parity bit are restored
to factory settings;
Support pulse counting, can be configured as rising edge counting,falling edge counting, level
counting method;
Hardware watchdog with high reliability;
3 indicators show operating status;
Power supply has good functions such as over-current, over-voltage, and anti-reverse connection;
Wide voltage input 8V-28V, 12V or 24V is recommended.
1. Quick start
This chapter is a quick start introduction to E831-RTU (4040R-485) series products. It is
recommended that users read this chapter and follow the instructions once and they will have a
systematic understanding of the module. Users can also choose chapters they are interested in to read as
needed. For specific details and instructions, please refer to the subsequent sections.

1.1. Port connection
1.1.1. RS485 Connection
Note: When transmitting high-frequency signals on the 485 bus, the signal wavelength is shorter than
the transmission line. The signal will form reflected waves at the end of the transmission line and
interfere with the original signal. Therefore, a termination resistor must be added at the end of the
transmission line so that the signal does not reflect after reaching the end of the transmission line. The
termination resistance should be the same as the impedance of the communication cable, with a typical
value of 120 ohms. Its role is to match the impedance of the bus to improve the anti-interference and
reliability of data communication.
1.1.2. Switch input connection

1.1.3. Relay output connection
1.2. Simple use
Wiring: The computer is connected to E831-RTU (4040R-485) via USB to RS485.
Power supply: E831-RTU (4040R-485) working voltage is DC 8 ~ 28V, 12V or 24V is recommended.
1.2.1. RS485 Bus control
Set the corresponding port parameters and click Search to search for the device.
When the device is found, click Stop

At this point, users can see the device address of the current device. Click on read parameters or write
parameters to read parameters and configure parameters.

Tick Auto Refresh to read and configure the input and output ports.
Note: Do not tick Auto refresh when reading or writing parameters. Instead, tick it after configuration
or reading is completed, otherwise the parameter writing or reading may not be successful.
2. Product introduction
E831-RTU (4040R-485) is an IO product that supports 4 digital inputs (default dry contact) and 4
relay outputs. It supports Modbus RTU protocol. The product is easy to use, allowing users to quickly
and easily integrate into their systems.
2.1. Basic parameters
Project
Index
Hardware parameter
Size(H*W*D)
105*75*30mm
Weight
279g
Interface method
Crimping method，1*12*5.08mm

Operating Voltage
DC8V~28V, 12V or 24V is recommended, over 28V
may damage the device
Operating current
12V@ 56mA stand-by current
Communication Interface
RS485：1200~115200bps
4 digital inputs
Dry contact, DI acquisition frequency 1KHz
4 relay outputs
Support 3A 30VDC、3A 250VAC
Baud rate
Baud rate range 1200~115200bps，factory default
9600
Operating temperature
-20℃~+70℃
storage temperature
-40℃~+85℃
Operating humidity
5%~95%
Storage humidity
1%~95%
2.2. Size, Interface description

No.
Ports and
other
definitions
Function
Description
1
PE
Connect with the earth
Connect with the earth
2
GND
Crimped power input
negative
Power supply reference ground
3
VCC
Crimped power input positive
Power input, DC 8V ~ 28V, 12V / 24V
recommended
4
RS485-G
RS485 signal reference
ground
RS485 signal reference ground, it is
recommended to connect
5
RS485-A
RS485 interface A
RS485 interface A is connected to device A
interface
6
RS485-B
RS485 interface B
RS485 interface B is connected to device B
interface
7
DI4
Digital input channel 4
Form dry contact with DIG
8
DI3
Digital input channel 3
Form dry contact with DIG

9
DIG
Digital input signal reference
ground
Digital input signal reference ground, used
with DI terminal
10
DI2
Digital input channel 2
Form dry contact with DIG
11
DI1
Digital input channel 1
Form dry contact with DIG
12
DIG
Digital input signal reference
ground
Digital input signal reference ground, used
with DI terminal
13
NO1
Relay 1 normally open pin
Used with relay 1 common terminal
14
COM1
Relay 1 common terminal
Used with relay 1 normally open pin /
normally closed pin
15
NC1
Relay 1 normally closed pin
Used with relay 1 common terminal
16
NO2
Relay 2 normally open pin
Used with relay 2 common terminal
17
COM2
Relay 2 common terminal
Used with relay 2 normally open pin /
normally closed pin
18
NC2
Relay 2 normally closed pin
Used with relay 2 common terminal
19
NO3
Relay 3 normally open pin
Used with relay 3 common terminal
20
COM3
Relay 3 common terminal
Used with relay 3 normally open pin /
normally closed pin
21
NC3
Relay 3 normally closed pin
Used with relay 3 common terminal
22
NO4
Relay 4 normally open pin
Used with relay 4 common terminal
23
COM4
Relay 4 common terminal
Used with relay 4 normally open pin /
normally closed pin
24
NC4
Relay 4 normally closed pin
Used with relay 4 common terminal
LED light
DATA
Serial data indication
Two-color light, green indicates data reception, blue indicates
data transmission
I/O
I / O status indicator
Two-color light, any one input has a signal, green indicator
is on, any one output has a signal, blue indicator is on, when
there is both output and input, both lights are on at the same
time, the indicator is cyan.
PWR
Power indicator
Red LED，Always on
Note：
Grounding: It is recommended to connect the case to the earth
2.3. Command reset description
Within 3 seconds after power-on, send a command to 485 serial port: AT + RESTORE \ r \ n can reset
the local MODBU address, serial port baud rate, and parity parameters are the default parameters
(1,9600, no parity).

3. Modbus
3.1. Modbus Address table
Register address table（function code：0x01H、0x05H、0x0FH、0x03H、0x06H、0x10H）
Address
Number
Attribute
Type
Value range
Support
function
code
00017
(0x0010)
1
DO1 Switch value output
Read/write
0x0000 or
0xFF00
（0x05function
code）
0-1（0x01、
0x0Ffunction
code）
0x01
0x05
0x0F
00018
(0x0011)
1
DO2 Switch value output
Read/write
00019
(0x0012)
1
DO3 Switch value output
Read/write
00020
(0x0013)
1
DO4 Switch value output
Read/write
Reserve
10017
(0x0010)
1
DI1 Switch value input
Read only
0-1
0x02
10018
(0x0011)
1
DI2 Switch value input
Read only
10019
(0x0012)
1
DI3 Switch value input
Read only
10020
(0x0013)
1
DI4 Switch value input
Read only
Reserve
40049
(0x0030)
1
DI1 Pulse count value
Read only
0-65535
0x03
40050
(0x0031)
1
DI2 Pulse count value
Read only
0-65535
40051
(0x0032)
1
DI3 Pulse count value
Read only
0-65535
40052
(0x0033)
1
DI4 Pulse count value
Read only
0-65535
Reserve
40065
(0x0040)
1
DI1-DI4 Pulse count clear
Write only
0x00 - 0x0F
0x06
Reserve
40078
(0x004D)
1
Device address
Read/write
1 - 247
0x03
0x06
0x10
40079
(0x004E)
1
Baud rate
Read/write
0 - 7
40080
(0x004F)
1
Parity bit
Read/write
0 - 2
40081
(0x0050)
1
Automatic report of switch value
Read/write
0 - 1
40082
(0x0051)
1
Switch value output time setting
(ms)
Read/write
100-65535
40083
(0x0052)
1
Switch value restart output status
setting
Read/write
0x00 - 0x10
40084
(0x0053)
1
Counting mode selection
Read/write
0-2
40085
(0x0054)
1
Filtering time setting
Read/write
1-20
40086
1
Manual / automatic clear count
Read/write
0-1

(0x0055)
Reserve
40300
(0x012B)
1
Version No.
Read only
--
0x03
3.2. Modbus Address table
Modbus Address table
1（Default）
1
2
2
3
3
…
…
245
245
246
246
247
247
3.3. RS485 Serial port baud rate code value table
Baud rate code value table
0
1200
1
2400
2
4800
3（Default）
9600
4
19200
5
38400
6
57600
7
115200
3.4. RS485 Serial port parity digit code value table
Parity digit code value
table
0（Default）
No parity
1
Even parity
2
Odd parity

3.5. Configure parameters through host
Select the “Parameter Setting” column to read and write parameters. For specific functions, refer to
product function introduction below.
Note: To set the parameters, please clear the “Auto Refresh” in the acquisition control page in order to
avoid sometimes the parameter writing is not successful.
4. Product features
4.1. Mode selection
The device supports 3 types of pulse counting methods, rising edge counting, falling edge counting and
level counting methods, see the pulse counting and clearing section below.

4.2. IO Basic function
4.2.1. Switch value DO output
4.2.1.1.Reading switch value DO output
Function code：01，Read coil status
Address range：00017(0x0010)~00020(0x0013)
Example：
Read 4 digital output status. Assuming the return value is 03, the corresponding binary bit is 0000
0011, which means that DO1 and DO2 are on. The 4 bits represent digital output status, which are DO4,
DO3, DO2, DO1 in order.
Modbus RTU protocol read digital output：
Transmis
sion
01
01
00 10
00 04
3C 0C
Device ModBus
Address
Function
code
Switch value
initial address
Read switch value
numbers
CRC parity code
Receivin
g
01
01
01
03
11 89
Device ModBus
Address
Function
code
Return bytes
numbers
Digital output value
CRC parity
code
4.2.1.2.Control switch value DO output
Function code：05，Write single coil status; 0F, write multiple coil status
Address range：00017(0x0010)~00020(0x0013)
Example：
Function code 0x05 writes DO2 digital output, the write value is FF 00; close D02 port, write the
value 00 00.
（At this time, NC2 and COM2 of DO2 are disconnected, and NO2 and COM2 are closed.）
Modbus RTU protocol write digital output：

Transmis
sion
01
05
00 11
FF 00
DC 3F
Device ModBus
Address
Function
code
Switch value
address
Write value
CRC parity code
Receivin
g
01
05
00 11
FF 00
DC 3F
Device ModBus
Address
Function
code
Switch value
address
Write value
CRC parity
code
Function code 0x0F writes DO2 and DO3 digital output. The write value should be 0x03,
corresponding to the binary bit 0000 0011. (Note that the initial address here starts from DO2.)
Modbus RTU protocol write digital output：
Transmis
sion
01
0F
00 11
00 02
01
03
62 95
Device ModBus
Address
Function
code
Switch
value
address
Write
switch value
numbers
Bytes
numbe
rs
Write
value
CRC
parity code
Receivin
g
01
0F
00 11
00 02
84 0F
Device ModBus
Address
Function
code
Switch
value
address
Write value
CRC parity code
4.2.2. Read switch value DI input
Function code: 02，Read（switch value）input status
Address range: 10017(0x0010)~10020(0x0013)
Description: The device defaults to dry contact input. When DI and DIG are short-circuited, the read
value should be 1. When DI and DIG are not short-circuited, the read value should be 0.
Example:
Read 4 digital input values. DI input terminal DI1 and DIG are short-circuited, DI2 and DIG are
not short-circuited, DI3 and DIG are short-circuited, DI4 and DIG are not short-circuited. The read
digital input value is 0x05, corresponding to the binary bit 0000 0101. The 4 bits represent the digital
input value, which are DI4, DI3, DI2, and DI1 in order.
Modbus RTU protocol read digital input：
Transmis
sion
01
02
00 10
00 04
78 0C
Device ModBus
Address
Function
code
Switch value
initial address
Read switch value
numbers
CRC parity code

Receivin
g
01
02
01
05
61 8B
Device ModBus
Address
Function
code
Return bytes
numbers
Digital input value
CRC parity
code
4.3. IO Features
4.3.1. Pulse counting and counting clear
The device supports 3 kinds of pulse counting methods, rising edge counting, falling edge counting,
and level counting. This value can be set by writing the corresponding value to the (0x0053) register.
Writing 0 represents rising edge counting, writing 1 represents falling edge counting, writing 2
represents level counting. If users choose rising edge counting, it will only count when DI detects that
level is on the rising edge. Other functions are similar.
In addition, the device also supports the input count filtering function, and the signal must be held for
several cycles can be confirmed. The default value is 6, 6 sampling cycles can be confirmed. The range
is 1-20. This value can be set by writing the corresponding value to the (0x0054) register, the sampling
cycle is 1ms. Note that this function only supports the level counting mode. The pulse count will not be
not saved after power off.
Counting clear also supports manual clear and automatic clear functions: input count is automatically
cleared or manually cleared after reading, which can be set. If it is automatically cleared, the register
value will be cleared after each reading. If it is manually cleared, then either the maximum count of
65536 is cleared or the register is written to clear. Writing 0 to the (0x0055) register means manual
clearing, and writing 1 means automatic clearing. Note that when automatic clearing is set, manual
clearing has no effect.
4.3.1.1.Reading pulse count value
Function code: 03，Read holding register
Address range: 40049 (0x0030)~40051 (0x0033)
Description: Maximum pulse count is 65535
Example:
DI1 has detected 16 pulses currently, DI2 has detected 3 pulses currently. Read the digital input
count value of DI1 and DI2.
Modbus RTU protocol read pulse count value:
Transmis
sion
01
03
00 30
00 02
C4 04
Device ModBus
Address
Function
code
Initial address
Read numbers
CRC parity code

Receivi
ng
01
03
04
00 10
00 03
BB F7
Device ModBus
Address
Function
code
Return
bytes
numbers
DI1 count
value
DI2 count
value
CRC parity
code
4.3.1.2.Manual clear pulse count value
Function code: 06, Write holding register
Address range: 40065 (0x0040)
Description: The lower four bits of the register value represent the counts of DI4, DI3, DI2, and DI1
respectively. Writing "1" means clearing the count and restarting the pulse count.
Example:
Clear the pulse count value of DI2 and DI4, and keep the pulse count value of DI1 and DI3. The
write value should be 0x0a, and the corresponding binary value is 0000 1010.
Modbus RTU protocol clear pulse count value:
Transmis
sion
01
06
00 40
00 0a
08 19
Device ModBus
Address
Function
code
Address
Write value
CRC parity code
Receivi
ng
01
06
00 40
00 0a
08 19
Device ModBus
Address
Function
code
Address
Write value
CRC parity
code
4.3.2. Automatic report of digital input DI
The digital input automatic report function is to transmit the changed value when the switch value
changes. Users can choose to transmit via RS485 or GPRS, or turn off the automatic report function.
The switch value automatically reports and sets the corresponding Modbus register to 40081
(0x0050). The value corresponds to the function:
0, Turn off switch value automatic report function
1, Switch value automatic report function transmit via RS485
The uploading protocol of switch value change is entered in the following table, where the frame
headers 0xAA and 0xBB are fixed. When the counting mode is set to level counting, the value range of
DI1, DI2, DI3, DI4, is 0x00, 0x01, 0xFF, of which
0x00 represents digital input is disconnected,
0x01 represents digital input is closed,
0xff represents digital input has not changed.

The values of DI1, DI2, DI3, and DI4 in the table represent that the status of DI1, DI2 is updated
to open, the status of DI3 is updated to closed, and the status of DI4 has not changed. The last two
bytes are calculation value of modbus CRC16.
Note: When set to rising edge counting mode, trigger once, the value of DI is 00, when set to
falling edge counting mode, trigger once, the value of DI is 01. Also 0xff means no change.
Frame
header
DI1
DI2
DI3
DI4
Modbus
CRC
0xAA 0xBB
0x00
0x00
0x01
0xff
0xBD 0xDA
4.3.3. Digital output DO time setting
The setting of digital pulse output time is to set the digital output time, the corresponding Modbus
register is 40083 (0x0052), and its value range is 100-65535ms. If the value is less than 100ms, the
default digital output is closed to hold status, that is, the digital value remains on after the output is
closed. If it is set to 100ms and above, such as 500ms, after the digital output close command is sent,
the switch value close will be maintained for 500ms, and then automatically open 500ms later.
4.3.4. Switch value DO restart output status setting
Whether the device is powered off and restarted to maintain the status before power off or restart
to maintain a specific output status setting. This function is only valid when the device digital output
time setting register value is less than 100ms.
The corresponding Modbus register of the switch value restart output status setting is 40085
(0x0054), and its value range is 0x00-0x10. When the value of this register is 0x10, the last digital
output status is maintained after power-off and restart. When the value of this register is 0x00-0x0F,
the lower 4 bits determine the status of the digital output of the device restart, bit4 corresponds to DO4,
bit3 corresponds to DO3, bit2 corresponds to DO2, bit1 corresponds to DO1. For example, when power
is on, DO4 and DO2 are in the closed status (relay NO and COM are closed), DO3 and DO1 are in the
open status (relay NO and COM are open). The corresponding register value is 0000 1010, that is, 0xa0,
"1" is the closed state, and "0" is the open status.
Revision history
Version
Data
Description
Issued by
1.0
-
Initial version
-
1.1
2019/8/19
Format adjustment
Linson

About us
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Support: [e-mail] Website: www.ebyte.com
Address: Innovation Center B333~D347, 4# XI-XIN road,High-tech district (west), Chengdu,
Sichuan, China