What is RTU?

In recent years, equipment in the field of Internet of Things communication has emerged one after another, and RTU equipment is one of them. In this article, I will introduce the key points of RTU related knowledge in detail.

1. Introduction to the concept of RTU

The full name of RTU in English is Remote Terminal Units, and in Chinese it is called Remote Terminal Unit.

Remote terminal equipment (RTU) is an electronic device installed at a remote site and used to monitor and measure sensors and equipment installed at the remote site. RTU converts measured states or signals into a data format that can be sent over the communication media. It also converts data sent from the central computer into commands to realize functional control of the equipment. RTU is mainly used in industry, agriculture, water conservancy, electric power, environmental protection, meteorology, earthquake, transportation, energy, commercial fields, etc.

2. Main features of RTU

RTU is the most basic component of the SCADA system. RTU is an electronic device installed at a remote site. Its main function is to monitor and measure sensors and other detection equipment installed at the work site. Its main purpose is to facilitate the supervision and measurement of signals and industrial devices at the remote work site. Control, RTU can not only convert the measured equipment status or the signal obtained by equipment measurement into a data format that can be sent on the communication media, it can also convert the data sent by the central computer into commands, thereby completing the control Functional control of the device.

In general, RTU can often be divided into two types: "single board RTU" and "module RTU". "Single-board RTU" integrates all I/O interfaces in one version. "Module RTU" is relatively simple in structure because it only has a single CPU module. Not only that, but it can also have other add-ons. Modules, basically these additional modules are implemented by adding a "backplane".

As a very durable remote field detection and control device, RTU can support communication between the SCADA control center and remote field devices. It is a separate data acquisition and control unit. Its main function is to control remote worksite equipment, thereby obtaining equipment data, and transmit the data to the dispatch center of the SCADA system.

?3. Main functions of RTU

It adopts a three-level watchdog detection mechanism, which is designed by the CPU’s own watchdog, hardware circuit watchdog, and software watchdog. It is composed of three-level multiple detection mechanisms, which can self-repair operating faults to ensure that the equipment never crashes; it adopts TCP heartbeat link detection mechanism, disconnection reconnection, and data resend to ensure that the equipment is always online; it adopts SMS and network dual-channel design, and the network The channel and SMS channel can be switched between each other. When TCP/UDP is disconnected, SMS can be used to send data.

The integrated design of collection and transmission ensures stable communication and saves costs. It integrates the functions of traditional hydrological telemetry terminals and 2.5G/3G/4G transmission functions to realize the collection, storage, and storage of hydrological/water resources data. Comprehensive functions such as display, control, alarm and transmission.

Supports large-capacity storage, long-term storage of setting parameters and historical data, provides 16MB of data storage space, can store more than 10 years of collected data, and supports TF card storage.

Supports remote parameter configuration (supports both platform configuration and SMS configuration) and remote program upgrade. Provides powerful central management software to facilitate equipment management.

? 4. Main applications of RTU

Telemetry terminal RTU can perform remote control, telemetry, remote signaling and remote adjustment in remote working environments, so the telemetry terminal RTU machine is very suitable for use in harsh environments. workplace. RTU products are widely used in oil and gas, hydrology and water conservancy, power dispatching, municipal dispatching and other industries.

? 5. What are the differences between RTU and DTU

RTU is generally used for monitoring, control and data collection applications. It has telemetry, remote signaling, remote adjustment and remote control functions. It usually integrates analog and digital inputs and outputs, PMW control, counters, RS232 and RS485 interfaces, and also has the function of a wireless router. DTU is a wireless transparent transmission device. It is a wireless terminal device specially used to convert serial port data into IP data or convert IP data into serial port data for transmission through a wireless communication network.