Volison IDM-7842MG Manuale utente

5-Ports 10/100M Ethernet Switch plus Isolated MODBUS

Gateway IDM-7842MG User's Manual

Functional introduction

The Modbus protocol is the most widely used protocol in the electronic industrial

equipment, and now it has become a general industrial standard. Through this protocol,

Modbus devices (such as PLC, DCS, HMI, and instruments) can communicate with each

other through a network or serial port. But the Modbus protocol used in the serial port

and the Ethernet network is different, so a gateway is needed to complete the

communication conversion between the two protocols. IDM-7842MG is a modbus

gateway product dedicated to connecting Modbus TCP devices and Modbus RTU/ASCII

devices.

IDM-7842MG is an isolated Modbus gateway device with multiple network ports. It

integrates 5 port 10/100M switches and 2 serial port Modbus gateways. Users can use

any port and 2 port RS-485/232 serial port to convert Modbus TCP and Modbus

RTU/ASCII protocol. The 2 port RS-485/232 serial port has photoelectric isolation. It is

integrated with Modbus TCP, Modbus RTU and Modbus ASCII protocol, and the serial port

can be configured flexibly into RS-485 or RS-232 mode through software, which can

easily realize the connection between Modbus Ethernet device and Modbus serial device.

Product features

1, 32 bit ARM Cortex-m3 CPU

2, 5-Ports 10/100M Ethernet interface, with switch function

3, Support 2-Port RS-485/232 serial port, two serial port can set different baud rate

4. RS-485/232 serial port photoelectric isolation, 1500V isolation voltage, 600W surge

protection, 15KV electrostatic protection

5. Redundant DC9~30V or AC18~30V dual power input

6. Integrated IEEE 802.3 10Base-T,IEEE 802.3u 100Base-T(X),ARP, IP, ICMP, IGMP,

UDP, TCP, DHCP, DNS,MODBUS TCP, MODBUS RTU, MODBUS ASCII

protocol

7. Provide 4 mode of work:

RTU_ Master--TCP_ Slaver, TCP_ Master--RTU_ Slaver

ASCII_ Master--TCP_ Slaver, TCP_ Master--ASCII_ Slaver

8. Maximum support for 32 Modbus TCP master stations and 4 Modbus TCP slave stations

9. Support two Modbus RTU/ASCII master stations and Modbus slave communication

10. The automatic adaptive function of the time interval of the character

11, Provide ID mapping function to realize the management of host ID number

12. The local port, the target IP address, and the target port number can be set

13, Can be configured through Web Server, Telnet, MG Configuration tools

14, MG Configuration tools support

Windows98/me/NT/2000/XP/WIN7/WIN8/WIN10 operating system

15, DIN-Rail Mounting, industrial design, can run steadily in bad environment

Product specification

Ethernet

Standard: 5-Ports 10/100Mbps adaptive Ethernet port

Communication mode: full duplex / half duplex adaptive

Transmission distance: less than 100 meters

Interface type: RJ-45

5-Ports 10/100M Ethernet Switch plus Isolated MODBUS

Gateway IDM-7842MG User's Manual

Serial port

Interface: 2-Port RS-485/232, Photoelectric isolation

RS-232: T, R, G

RS-485: D+, D-

Parity bit: None\Even\Odd\space\mark

Data bits: 6bit, 7bit, 8bit

Baud rate: 300BPS to 230400bps

Direction control: RS-485 uses data flow direction automatic control technology

Load capability: RS-485 terminal support maximum 128 node polling

Transmission distance: RS-485 is 1000 meters,RS-232 is 10 meters

Interface protection: 1500V isolation, 600W surge protection, 15KV ESD protection

Power Supply

Power input: AC18~30V or DC9~30V, Double redundant input

Power consumption: 240mA @ 24V (Max)

Environmental

Working temperature: -20 C ~ 70 C

Storage temperature: -40 C ~ 95 C

Storage humidity: 5 ~ 95% RH

Package size

Restore the default settings

Hardware recovery: Press the Default key to restart the power and wait for 3 seconds

to undo the Default key to restore the factory settings.

Software recovery: Search the device through the MG Configuration tool software

and click to restore the factory settings button.

5-Ports 10/100M Ethernet Switch plus Isolated MODBUS

Gateway IDM-7842MG User's Manual

LED instructions

Power indication: "P1",”P2” bright yellow is the normal power supply

Serial Port 1 sending and receiving indication: "COM1" is Flash

Serial Port 2 sending and receiving indication: "COM2" is Flash

Interface definition

RS-232： COM1(T, R, G) / COM2(T, R, G)

RS-485： COM1 (D+, D-) / COM2(D+, D-)

Network interface: 5-Ports RJ45 (Ethernet)

Power interface: P1 (V+, V-), P2 (V+, V-)

5-Ports 10/100M Ethernet Switch plus Isolated MODBUS

Gateway IDM-7842MG User's Manual

Composition Principle

Configuration instructions

There are three configurations of IDM-7842MG, which are the Telnet console, the Web

server console, and the MG Configuration PC software configuration.

Web server console configuration instructions

1. Open the IE browser Enter the IP address of the IDM-7842MG Modbus gateway in the

address bar (default: 192.168.10.245)

2. Set the basic parameters

Gateway name：Device name (less than 11 characters).

Gateway address：The location of the device (less than 11 characters).

Web console："Enable" enables Web console, and "Disable" closes Web console.

Telnet console："Enable" enables Telnet console, and "Disable" closes the Telnet

console.

3. Network parameter configuration

MAC address：The MAC address of the IDM-7842MG device can not be changed.

IP address：The IP address of the IDM-7842MG device in the network.

Net mask：Subnet mask.

Gateway：Gateway address.

5-Ports 10/100M Ethernet Switch plus Isolated MODBUS

Gateway IDM-7842MG User's Manual

IP configuration：The type of IP address, DHCP: dynamic IP automatic acquisition,

Static: static IP address.

DNS server：When the target IP is a domain name, DNS server is the IP address of the

domain name resolution server.

4, Serial port configuration

Baud Rate：Serial baud rate, 300~230400 can be selected.

Data Bits：Serial data bit, 6,7,8 bit can be selected.

Stop Bits：The stop bit of the serial port can be selected as 1, 1.5, and 2 bits.

Parity：Parity bit, None\Even\Odd\space\mark can be selected, default is None

Timeout (Frame Interval Time): When the device is set to Modbus RTU protocol mode,

data frames are distinguished by serial idle time. If the serial idle time is longer than the

frame interval time, the Modbus Gateway confirms that a frame data has been received,

and then the frame data is checked and converted into TCP data frame and sent to

Ethernet. Timeout (Frame Interval Time) range is (0-15000) ms, set to 0 is automatically

adapted frame interval time.

Note: If multiple Modbus TCP master stations and Modbus gateways establish TCP

connections, or serial RS-485 bus access multiple Modbus RTU slave stations, Timeout

(Frame Interval Time) must be set larger, so that RS-485 slave stations can clearly

capture command frames sent by TCP master stations, and the recommended setting is

50ms.

Interface：Serial interface type, can choose RS-485, RS-232 two formats.

5-Ports 10/100M Ethernet Switch plus Isolated MODBUS

Gateway IDM-7842MG User's Manual

5, Modbus gateway operation mode configuration

IDM-7842MG Modbus Gateway provides 4 work mode:

(1), TCP_ Master-RTU_ Slaver: Network end connection Modbus TCP master station,

serial connects Modbus RTU slave station

(2), TCP_ Master-ASCII_ Slaver: Network end connection Modbus TCP master

station, serial port connects Modbus ASCII slave station

Max connection：The maximum number of connections allowed by Modbus TCP master

station is 32. Users can adjust this parameter according to the actual application. When

users do not need 32 connections, they can be reduced to improve performance. The

effective range of the maximum number of connections is 1~32. You need to change this

value when multiple TCP master stations or multiple RTU/ASCII slave stations.

Local TCP port： The default port number of the standard Modbus TCP protocol is 502,

and the user can modify it according to the actual application.

Message Timeout (Message Response Time): Modbus protocol is a master-slave

protocol. The master station waits for the slave station to respond after sending the

request. The range of Message Timeout (Message Response Time) is 100-32000ms, and

the default value is 200ms. When multiple TCP master stations communicate with

RTU/ASCII slave stations, the TCP master station will wait for the response of the

RTU/ASCII slave station after sending the request. If the RTU/ASCII slave station does

not respond within a set time, then the Modbus gateway will forward the request

instruction of the next TCP master station.

Serial Port 1: the setting of serial port 1

Serial Port 2: the setting of serial port 2

ID range：ID range. The two serial ports need to set different ID ranges. If the ID

number of the Modbus TCP master's data frame is not in the ID range of serial port 1 or

serial port 2, the frame data will be discarded. If the ID number of the data frame is in the

range of ID of serial 1, the frame data will be sent to the serial port 1. If it is in the range

of ID of the serial port 2, it will be sent to the serial port 2. The ID range of the serial port

1 and the ID range of the serial port 2 can not be repeated.

ID Mapping：ID mapping capabilities, optional AUTO and Fixed.

5-Ports 10/100M Ethernet Switch plus Isolated MODBUS

Gateway IDM-7842MG User's Manual

AUTO：When Auto ID is selected, the ID number in the Modbus TCP master station

request frame is not modified and will be sent directly to the serial port slave station

device.

Fixed： When Fixed ID is selected, the ID number in the Modbus TCP master station

request frame is replaced with a fixed ID number and then sent to the serial port slave

station device. The serial port slave station device returns the frame, it's ID number is

converted to before the change, and then to the Modbus TCP master station.

Fixed ID Value： Fixed ID number, when selecting Fixed, Modbus Gateway uses this

fixed ID number to access the serial port slave device, the range is 1~247.

(3), RTU_ Master-TCP_ Slaver: Network end connection Modbus TCP slave station,

serial port connection Modbus RTU master station, in this mode, all two serial ports can

connect to the Modbus RTU master station

(4), ASCII_ Master-TCP_ Slaver: Network end connection Modbus TCP slave station,

serial port connection Modbus ASCII master station, in this mode, all two serial ports can

connect to the Modbus ASCII master station

Destination IP address：When Modbus Gateway works in TCP_ Slaver mode, it can

support 4 Modbus TCP slave connections. Users can set IP address of target host to

connect Modbus TCP slave station. When the target connection is not used, the IP

address should be modified to 0.0.0.0. Otherwise, the Modbus Gateway device will

continuously send the connection request, so that it will affect the network

performance.When the target host address is a domain name, "/" is added before the

domain name, and "/" represents the domain name. The length must be less than 20

characters

Port：The port number of the target host, the default port number of the standard

Modbus TCP protocol is 502, and the user can modify it.

ID mapping:

Min ID/Max ID：The minimum value of ID and the maximum value of ID, and its range

is 0~247. When the serial Modbus master station connects TCP slave station, the Modbus

Gateway device will check whether the target is within the range, and if it is not in the

range, it will not be sent. Max ID can't be less than Min ID, otherwise it is treated as Min

ID. When Max ID<=Min ID, the Modbus Gateway device uses Min ID, and the ID range of

the 4 connections cannot be repeated, otherwise the error will occur.

ID offset：ID offset, the Modbus protocol stipulates that all slave station devices must

5-Ports 10/100M Ethernet Switch plus Isolated MODBUS

Gateway IDM-7842MG User's Manual

have a unique ID number (1~247), which is used to identify the slave station address.

The ID number of Modbus slave station device can be modified. When the Modbus serial

master station access the TCP slave station, the target ID will add the offset and then

sent to the Modbus TCP slave station. When the Modbus TCP slave station returns the

data, the offset is subtracted from the ID number and then sent to the serial port

MODBUS master station.

Technical support

Email: liuchangshandx@126.com

QQ： 513409265

Website：www.volison.com

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