What’s modbus rtu protocol? And what’s the purpose of the protocol?

Modbus RTU protocol is one communication way to allow Programmable Logic Controller(PLC) exchange data with computers. With Modbus protocol, electronics equipments can exchange information through serial line. Modbus RTU has popular acceptance in the world, is widely used in Building Management System(BMS) and Industrial Automation System(IAS). It is easy to use, reliable and open source, can be used in any equipments and program free of charge, so more and more people use it.

In order to edit Programmable Logic Controller, Modbus RTU protocol was developed and released in 1979. It adopted master-slave structure, support serial server which support RS232/RS485/RS422 protocol. Modbus RTU often use multiple meters and controlling devices transmit signals to central controller or systems so as to gather and analyze data. Automated industry, security control and data collection system normally use Modbus RTU protocol.

What does Modbus RTU represent?

Modbus RTU is one of original Modbus specification defined two transmission ways, and the two ways is Modbus and ascii, both designed to support serial port equipment which support RS232/RS485/RS422 protocol. The notable features of Modbus is to take binary encoding and strong CRC error checking. Modbus RTU is actor of Modbus protocol, widely used in industrial applications and automated production facilities.

How to use serial port monitor to test Modbus RTU?

 In some cases, it is helpful to use Modbus RTU tester, if you want to develop or test serial port equipment or apps, and you hope to monitor and analyze data transmission between equipments and apps. If you’re in charge of maintain network in automated industrial production facilities and related equipments, you’ll know that Modbus RTU monitor program is most important.

 Modbus RTU activity analysis serial port sniffer can open any serial port, or even another program opened serial port, can monitor all activities with serial port immediately. Real-time data collection can find problems without any delay. You can save the monitor data as one new file, or copy to other appointed folder so that you can analyze it in future, and it can monitor several serial ports at same time.