Ebyte ME31-AXXX8000 User manual

ME31-AXXX8000
I/O Networking Module

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Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd
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Contents
1. Product overview ........................................................................................................................................................1
1.1 Introduction ...................................................................................................................................................... 1
1.2 Features .............................................................................................................................................................1
1.3 Application typology diagram ..........................................................................................................................2
2. Quick start ...................................................................................................................................................................3
2.1 Devices required ...............................................................................................................................................3
2.2 Device connection ............................................................................................................................................ 3
2.2.1 DI switch input connection ................................................................................................................... 4
2.2.2 Simple use ............................................................................................................................................. 4
2.3 Parameter configuration ................................................................................................................................... 4
2.4 Control test ....................................................................................................................................................... 5
2.4.1 Modbus TCP Control ............................................................................................................................ 5
2.4.2 Modbus RTU Control ............................................................................................................................6
3 Technical indicator ...................................................................................................................................................... 7
3.1Specification and parameter ..............................................................................................................................7
3.2 Device default parameter ................................................................................................................................. 7
3.3 Dimensions ....................................................................................................................................................... 8
3.4 Ports and indicators .......................................................................................................................................... 9
4 Product function introduction ....................................................................................................................................11
4.1DI input ............................................................................................................................................................11
4.1.1Switch input DI acquisition ..................................................................................................................11
4.1.2 Input filtering .......................................................................................................................................11
4.2 Modbus gateway .............................................................................................................................................11
4.2.1 Modbus TCP/RTU Protocol Conversion ............................................................................................ 11
4.2.2 Modbus address filtering .....................................................................................................................11
4.2.3 Modbus TCP protocol data frame description .................................................................................... 12
4.2.4 Modbus RTU protocol data frame description ................................................................................... 12
4.3 Active upload ..................................................................................................................................................12
4.4Custom Module Information ...........................................................................................................................13
4.4.1 Modbus address ...................................................................................................................................13
4.4.2 Module name .......................................................................................................................................13
4.4.3 Network parameter ..............................................................................................................................13
4.4.4 UART parameter ................................................................................................................................. 13
4.5OLED display and parameter configuration ................................................................................................... 14
4.5.1 Information display interface .............................................................................................................. 14
4.5.2 Device parameter display interface .....................................................................................................14
4.5.3 Device parameter configuration interface ...........................................................................................15
4.5.4 Screen sleep .........................................................................................................................................15
4.6MODBUS parameter setting ........................................................................................................................... 16
4.6.1 DI register list ......................................................................................................................................16
4.6.2 Module related register ....................................................................................................................... 16
4.6.3 Network related register ......................................................................................................................17
4.6.4 Modbus command operation ...............................................................................................................18

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5 Host computer ........................................................................................................................................................... 21
5.1 Acquisition and control .................................................................................................................................. 21
5.2 Parameter Configuration Interface .................................................................................................................22
Revision history ............................................................................................................................................................24

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1. Product overview
1.1 Introduction
ME31-AXXX8000 is equipped with 8 dry contact input
detection,supports Modbus TCP protocol or Modbus RTU protocol for
acquisition and control and can be used as a simple Modbus gateway
(automatically send commands with non-local Modbus addresses through
the serial port/network port).
1.2 Features
Good for standard Modbus RTU protocol and MODBUS TCP protocol;
Work with various configuration software/PLC/touch screen；
RS485 acquisition control I/O；
RJ45 acquisition control I/O，support 4 channel master access；
Support OLED display screen to display status information, and device parameters can be configured through
buttons;
8-channel switch input DI (dry node) ；
Support custom Modbus address settings；
Support 8 common baud rate configurations ；
DHCP and static IP；
DNS function, domain name analysis；
Support Modbus gateway；

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1.3 Application typology diagram
Network port application topology
Serial port application topology

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2. Quick start
Note: The test need to carry out with factory parameter.
2.1 Devices required
ME31-AXXX8000
12V SMPS
USB to RS485
Computer
RJ45 Cable
More cables
2.2 Device connection
2.2.1 RS485 connection
Note: When the 485 bus high frequency signal is transmitted, the signal wavelength is shorter than the transmission
line, and the signal will form a reflected wave at the end of the transmission line, which will interfere with the

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original signal. Therefore, a terminal resistance must be added at the end of the transmission line to prevent the
signal from being reflected after reaching the end of the transmission line. The terminal resistance should be the
same as the impedance of the communication cable, with a typical value of 120 ohms. Its function is to match the
bus impedance and improve the anti-interference and reliability of data communication.
2.2.1 DI switch input connection
2.2.2 Simple use
Wiring: The computer is connected to the RS485 interface of ME31-AXXX8000 through USB to RS485, A is connected to A, B is connected to B.
Networking: Insert the network cable into the RJ45 port and connect to the PC.
Power supply: Use DC-12V switching power supply (DC 8~28V) to supply power to ME31-AXXX8000.
2.3 Parameter configuration
Step 1: Modify the IP address of the computer to be consistent with the device. Here it is modified to 192.168.3.100
to ensure the same network segment as the device and that the IP is different. Please turn off the firewall and try
again if the step failed;

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Step 2: Open the network assistant, select the TCP client, enter the remote host IP192.168.3.7 (default parameters),
enter the port number 502 (default parameters), and select HEX to send.
2.4 Control test
2.4.1 Modbus TCP Control
Use network assistant to control ME31-AXXX8000, first channel DO output.

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To test other function according to below table
Function （function code）
Command
Read all DI state（0x02）
01 00 00 00 00 06 01 02 00 00 00 08
2.4.2 Modbus RTU Control
Use network assistant to control ME31-AXXX8000, first channel DO output.
To test other function according to below table
Function （function code）
Command
Read all DI state（0x02）
01 02 00 00 00 08 79 CC

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3 Technical indicator
3.1Specification and parameter
Category
Name
Parameter
Power supply
Operating voltage
DC8～28V
Power indicator
Blue LED indicator
Serial port
Communication
interface
RJ45、RS485
Baud rate
9600bps（can be defined by user）
Communication
protocol
Standard Modbus TCP,Modbus RTU
MODBUS
Device address
Modify via Modbus command and computer
DI input
DI channels
8 channel
Input type
Default dry node
Acquisition
frequency
1 kHz
Input indicator
OLED display, red LED
Others
Product size
121mm * 72mm * 34mm
Product weight
135 ±5 g
Working
temperature and
humidity
-40 ～+85℃、5% ～95%RH（no
condensation ）
Storage
temperature and
humidity
-40 ～+105℃、5% ～95%RH（no
condensation ）
Installation
Din rail installation
3.2 Device default parameter
Category
Name
Parameter
Ethernet parameter
Working mode
TCP server （Max 4 channel client
access）
Local IP
192.168.3.7
Local port
502
Subnet mask
255.255.255.0
Gateway address
192.168.3.1

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DHCP
Off
Local MAC
Depending on chip（fixed）
Target IP
192.168.3.3
Target port
502
DNS server
114.114.114.114
Active upload
Off
UART parameter
Baud rate
9600bps（8 type）
Check method
None（default）、Odd、Even
Data bit
8
Stop bit
1
MODBUS parameter
Modbus master slave
Slave
Address
1
3.3 Dimensions

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3.4 Ports and indicators
No.
Sticker
Remarks
1
TX（LED）
UART TX data
2
RX（LED）
UART RX data
3
LINK（LED）
Network link
4
NET（LED）
Network data TX and RX
5
PWR（LED）
Power input
6
DI1（LED）
Switch input indicator of channel 1
7
DI2（LED）
Switch input indicator of channel 2
8
DI3（LED）
Switch input indicator of channel 3
9
DI4（LED）
Switch input indicator of channel 4
10
DI5（LED）
Switch input indicator of channel 5
11
DI6（LED）
Switch input indicator of channel 6
12
DI7（LED）
Switch input indicator of channel 7
13
DI8（LED）
Switch input indicator of channel 8
14
GND
Negative pole of power input terminal，DC 8V~28V，5.08mm phoenix terminal
15
VCC
Positive pole of power input terminal，DC 8V~28V，5.08mm phoenix terminal
16
DI5
Switch input channel 5, support dry contact access ，5.08mm phoenix terminal

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17
GND
Channel 5 switch input ground，5.08mm phoenix terminal
18
DI6
Switch input channel 6, support dry contact access ，5.08mm phoenix terminal
19
GND
Channel 6 switch input ground，5.08mm phoenix terminal
20
DI7
Switch input channel 7, support dry contact access ，5.08mm phoenix terminal
21
GND
Channel 7 switch input ground，5.08mm phoenix terminal
22
DI8
Switch input channel 8, support dry contact access ，5.08mm phoenix terminal
23
GND
Channel 8 switch input ground，5.08mm phoenix terminal
24
Ethernet
Standard RJ45 interface
25
DI4
Switch input channel 4, support dry contact access ，5.08mm phoenix terminal
26
DI3
Switch input channel 3, support dry contact access ，5.08mm phoenix terminal
27
DI2
Switch input channel 2, support dry contact access ，5.08mm phoenix terminal
28
DI1
Switch input channel 1, support dry contact access ，5.08mm phoenix terminal
29
GND
Channel 1-4 switch input ground，5.08mm phoenix terminal
30
485-A
A of the RS-485 serial port is connected to the A port of the external device ，
5.08mm phoenix terminal
31
485-B
B of the RS-485 serial port is connected to the B port of the external device ，
5.08mm phoenix terminal

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4 Product function introduction
4.1DI input
4.1.1Switch input DI acquisition
Switch input DI measurement level signal or edge pulse signal (rising edge, falling edge). Support dry node
collection, support DI counting function, the maximum count is 65535 (the count is automatically cleared if it
exceeds 65535).
The switch input DI branch has three trigger modes: rising edge, falling edge and level (default rising edge
trigger).
The clearing method supports automatic clearing and manual clearing (default automatic clearing).
4.1.2 Input filtering
When the switch input DI collects the signal, it needs to keep several sampling cycles before confirming. Filter
parameters can be set in the range of 1 to 16 (default 6 sampling periods, 6*1kHz).
It can be configured with the host computer through instructions.
4.2 Modbus gateway
The device can transmit non local Modbus instructions from the network/serial port to the serial port/network,
and the local Modbus instructions can be executed directly.
4.2.1 Modbus TCP/RTU Protocol Conversion
After being turned on, the Modbus TCP data on the network side will be converted into Modbus RTU data.
4.2.2 Modbus address filtering
This function can be used in certain host software or configuration screens as the host to access the device
serial port, and the gateway function of the device is used. When the slave is on the network side and the Modbus
TCP to RTU function is enabled, the presence of multiple slaves on the bus may cause data confusion. At this time,
enabling address filtering can ensure that only the specified address can pass through the device; When the
parameter is 0, data is transmitted through, and when the parameter is 1-255, data is only transmitted through the
set slave address.

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4.2.3 Modbus TCP protocol data frame description
TCP frame format：
Transaction ID
Protocol ID
Length
Device Address
Function Code
Data Segment
2 Bit
2 Bit
N+2 Bit
1 Bit
1 Bit
N Bit
Transaction identification: It can be understood as the serial number of the message. Generally, 1 is added
after each communication to distinguish different communication data messages.
Protocol identifier: 00 00 means Modbus TCP protocol.
Length: Indicates the next data length, in bytes.
For example：get DI state
01 00
00 00
00 06
01
02
00 00 00 04
Transaction ID
Protocol ID
Length
Device Address
Function Code
Data Segment
4.2.4 Modbus RTU protocol data frame description
RTU frame format：
Device Address
Function Code
Data Segment
Check code CRC
1 Bit
1 Bit
N Bit
2 Bit
For example：get DI state command
01
02
00 00 00 04
79 C9
Device Modbus address
Function Code
Data Segment
CRC check code
4.3 Active upload
The device supports the function of uploading analog input values at fixed time intervals. Setting the value of
the corresponding register can control the interval time and whether to upload or not.
The device with digital input will actively upload once after connecting to the server successfully, and then the
digital input will be uploaded following the status change, and the device with analog input will report the status of
the analog input according to the configuration of the active upload time period (the configuration period is
1-65535 ).
When set to 0, the upload is closed, and when set to another positive integer value N, the upload is performed
at intervals of N seconds.
[Note] The device can only be valid if it is in the client mode configuration. If the register value is non-zero,
active uploading is enabled.

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4.4Custom Module Information
4.4.1 Modbus address
The default address of the device is 1, and the address can be modified. The address range is 1-247.
4.4.2 Module name
Users can configure the device name for differentiation according to their own needs. It supports English and
digital formats, and the maximum length is 20 bytes.
4.4.3 Network parameter
Unless otherwise specified: The following network-related parameters default to IPV4-related
parameters.
(1) MAC of the device: the user can obtain it by reading the specified register, and this parameter cannot be
written.
(2) IP address: IP address of the device, readable and writable.
(3) Modbus TCP port: the port number of the device, readable and writable.
(4) Subnet mask: address mask, readable and writable.
(5) Gateway address: gateway.
(6)DHCP: Set the way the device obtains IP, static (0), dynamic (1).
(7)Target IP: When the device works in client mode, the target IP or domain name of the device connection.
(8)Target port: When the device works in client mode, the target port to which the device is connected.
(9)DNS server: When the device is in client mode, it resolves the server domain name.
(10)Module working mode: switch the working mode of the module. Server: The device is equivalent to a
server, waiting for the user's client to connect, and the maximum number of connections is 4. Client: The
device actively connects to the target IP and port set by the user.
(11)Active upload: When the secondary parameter is not 0 and the device is in the client mode, the discrete
input state of the device will be uploaded to the server after the initial connection or input changes, and the
analog input will be uploaded according to the configured time period.
4.4.4 UART parameter
Parameters for setting serial communication:
Default parameters:
Baud rate: 9600(03);
Data bits: 8bit;
Stop bit: 1bit;
Check digit: NONE(00);

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(1) Baud rate：
Baud rate code value table
0x0000
1200
0x0001
2400
0x0002
4800
0x0003（default）
9600
0x0004
19200
0x0005
38400
0x0006
57600
0x0007
115200
(2) Check digit：
Check digit
0x0000(默认)
NONE
0x0001
ODD
0x0002
EVEN
4.5OLED display and parameter configuration
The display interface includes information display page ( DI input status) and parameter setting page (part
of parameters).
4.5.1 Information display interface
Including the current input value display page, shortly press the left and right buttons to switch the interface
4.5.2 Device parameter display interface
Press the left or right button to enter the password input interface, complete the correct password input, and
display the device parameter information interface (password interface: default password: 0000; short press the
middle verification password, left and right buttons to switch password bits, up and down buttons to switch current
bit values, a total of 4 digits of the password, with each input range of 0-9 digits):
The parameter setting interface from top to bottom is
1. :Modbus address;
2. Baud rate;

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3. Data bits;
4. Check digit;
5. Stop bit;
6. Local port
7. Local IP address
8. Network mode
9. Gateway
10. Subnet mask
11. DNS
12. MAC address
13. DHCP
14. Target IP
15. Target port
16. Modbus TCP/RTU protocol conversion
17. Active upload
18. Modbus address filtering
4.5.3 Device parameter configuration interface
Long press the confirm button to enter the password input interface, complete the correct password input, and
enter the configuration interface (password interface: default password: 0000; short press the middle to verify the
password, left and right buttons to switch password bits, up and down buttons to switch current bit values, a total of
4 digits of password, with each digit entering a range of 0-9 numbers).
Select the setting option, enter the parameter configuration page, and briefly press the up and down keys to
switch between the setting options;
Select the setting item, short press to confirm or right-click, and the cursor for the setting item represents the
selected item and enters the setting item;
Adjust parameter values: After selecting the setting option, the up and down keys can change the numerical
value or optional values; Press the left and right buttons to move the cursor within the parameter item;
Confirm parameter values: After adjusting the parameter values, press the confirm button to exit the current
setting.
Save parameter settings and restart: After setting the parameters, move the cursor to save and restart, then
short press the confirm button to enter the confirm save and restart state. Short press the confirm button (press other
buttons to exit the confirmation state) to save the parameters and restart the device.
Exit without saving parameters: move the cursor to Exit, and then press the OK key briefly to enter the
confirmed Exit status. Press the OK key briefly (press other keys to exit the confirmed status) to exit the parameter
configuration interface without saving parameters.
Among them, the data bits and stop bits cannot be set. After enabling DHCP mode, the local IP address,
gateway, and subnet mask cannot be configured and only assigned by the router;
4.5.4 Screen sleep
The device screen has a sleep function, which is turned off by default and can be set to turn on in the configuration

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interface.
In any interface, after 180 seconds of no button operation, the screen will enter sleep mode, and the interface will
display Xiaoyi Robot. Press any button to exit sleep mode.
When the screen is dormant, the efficiency of device program operation will be improved.
4.6MODBUS parameter setting
4.6.1 DI register list
Register function
Register
address
Register
type
Quantity
Operation
Data Range/Remarks
Related
function codes
DI state
0x0000
Discrete
input
8
R
Enter the port state
R：0x02
DI filter
parameters
0x04B1
Holding
register
1
RW
Digital filter parameter,
the range is 1~16, the
smaller the number, the
more sensitive, the
larger the more stable,
the default is 6
R：0x03
W：0x06、0x10
DI pulse count
value
0x09DF
Holding
register
8
RW
Enter count value
R：0x03
W：0x06、0x10
DI clear way
0x0A43
Holding
register
8
RW
0x0000 auto clear
0x0001 manual clear
R：0x03
W：0x06、0x10
DI manual clear
signal
0xAA7
Holding
register
8
RW
The clearing method is
manual, and the register
writes 1 to clear the
count value
R：0x03
W：0x06、0x10
DI count way
0x0B0C
Holding
register
8
RW
Set DI count way
R：0x03
W：0x06、0x10
4.6.2 Module related register
Register function
Register
address
Register
type
Quantity
Operation
Data Range/Remarks
Related
function codes
Module address
0x07E8
Holding
register
1
RW
Modbus address，
1～247 configurable
R：0x03
W：0x06
Module model
0x07D0
Holding
register
12
R
Get current model
R：0x03
Firmware version
0x07DC
Holding
register
1
R
Get firmware version
R：0x03

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4.6.3 Network related register
Register function
Register
address
Register
type
Quantity
Operation
Data Range/Remarks
Related
function codes
Module MAC
address
0x0898
Holding
register
3
R
Device MAC parameter
R：0x03
Local IP address
0x089B
Holding
register
2
RW
Default：192.168.3.7
R：0x03
W：0x06、0x10
Local port
0x089D
Holding
register
1
RW
1～65535，default：502
R：0x03
W：0x06、0x10
Subnet mask
0x089E
Holding
register
2
RW
Default：255.255.255.0
R：0x03
W：0x06、0x10
Gateway address
0x08A0
Holding
register
2
RW
Default：192.168.3.1
R：0x03
W：0x06、0x10
DHCP mode
configuration
0x08A2
Holding
register
1
RW
0x0000 static IP
（default）
0x0001 automatically
get IP
R：0x03
W：0x06、0x10
Target IP/Domain
Name
0x08A3
Holding
register
64
RW
Store in strings
IP/Domain Name
Default IP：192.168.3.3
R：0x03
W：0x06、0x10
Server port
0x08E3
Holding
register
1
RW
0-65535，Default 502
R：0x03
W：0x06、0x10
DNS server IP
address
0x08E4
Holding
register
2
RW
Default 8.8.8.8
R：0x03
W：0x06、0x10
Module operating
mode
0x08E6
Holding
register
1
RW
0x0000 server mode
0x0001 client mode
R：0x03
W：0x06、0x10
Active upload
0x08E7
Holding
register
1
RW
0x0000 prohibited ，
Other：
R：0x03
W：0x06、0x10
Module name
0x07DE
Holding
register
10
RW
Define module name
R：0x03
W：0x10
Module reset
0x07EA
Holding
register
1
W
Enter any value to reset
W：0x06
Restore factory
parameter
0x07E9
Holding
register
1
W
Enter any value to
restore
W：0x06
Serial baud rate
0x0834
Holding
register
1
RW
See the baud rate code
table，
Default 9600（0x0003）
R：0x03
W：0x06、0x10
Serial check digit
0x0836
Holding
register
1
RW
0x0000 none（default）
0x0001 odd
0x0002 even
R：0x03
W：0x06、0x10