Apr 30, 2018 A Modbus Master simulator is used to query data from devices and can be a valuable test when developing a Modbus Slave device. A large number of Master simulators are readily available, including free of charge, open source, and commercial software.
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Modbus is an openly published communication protocol built on a master-slave architecture. It is implemented in a wide range of industries for establishing communication among various electronic devices. Modbus protocol can be used for sending data over serial lines RS-485, RS-422, RS-232, and TCP/IP (Modbus TCP) protocols. Modbus over UDP is also possible although not widely used.
ContentsTypes of Modbus Software and their usage
As mentioned before Modbus protocol is very widely implemented, especially the serial versions of it (RTU and ASCII ones). Modbus RTU is actually the most common usage of Modbus protocol. Are you developing software that communicates with electronic devices through Modbus RTU? In this case you will surely appreciate a high-quality Modbus RTU software for monitoring and analysis of data sent via this protocol. Same with Modbus ASCII variation.
Modbus Protocol Analyzer offers a convenient way to track down the possible problems during development of an application or a driver, test and optimize serial
This professional Modbus test software allows you to:
14-day free trial
The challenge of splitting Modbus data
As you already know, a typical Modbus communication is established between multiple sensors and a single controller (or a server) that receives the incoming data via a serial communication interface. This COM port is usually controlled by a specialized serial app. In many cases, however, it may be required to open the receiving port with several applications at a time. As a rule, this does not seem possible unless you use a dedicated Modbus splitter software.
Virtual COM Port Driver Pro by Eltima is probably the most optimal solution for this task. The program works as a serial port splitter able to duplicate data coming into one COM port to an unlimited number of real and virtual serial interfaces. Virtual COM Port Driver Pro will help you create as many virtual RS485 (RS232, RS422) ports as you need in your system. So if you want your Modbus traffic to be received by several apps simultaneously, you can simply create virtual copies of the master’s receiving COM port and connect the required apps to them. Virtual COM Port Driver Pro will duplicate the traffic to all of the virtual copies of the real COM port and this way several apps will be able to receive the same data at a time.
Share Modbus devices over TCP
Another special option that really deserves your attention is sharing Modbus over Ethernet. You can make a local Modbus device accessible to multiple remote users with the help of a handy network solution - Serial to Ethernet Connector.
This advanced utility makes it possible for you to work with up to 500 remote Modbus devices at a time. A really nice thing about the Modbus over IP software is that it can run in the background as a service, which means you don’t need to always keep it open. What’s more, the program is able to backup a configuration and move it to another machine this way saving you time and effort.
For now, Modbus to Ethernet Connector is available for Windows and Linux platforms. And the version for Linux is a command-line solution.
Master and Slave Modbus Simulators
What is Modbus and how it works - basic principles
Modbus protocol is a messaging structure of a master-slave communication between intelligent electronic devices. As a rule signals are transferred from devices back to a main controller or a resource gathering the data. A master device can direct a request individually to a slave device or broadcast it to all slaves. When individual signal is received, the slave will respond, whereas when the signal is broadcast, the response is usually not anticipated. The first byte the master sends is the slave address. This way each slave device knows whether to ignore the message or to listen to it after this first byte.
There are two variations of Modbus protocol used in serial communication:
Serial Port Monitor
Requirements: Windows XP/2003/2008/Vista/7/8/10/Server 2012 , 9.16MB size
Version 7.0.342 (16 Jan, 2018) Release notes Category: Serial Port Software
30 May at 18:25
20 February at 15:53
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