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These RTU/TCP are all more important protocols in the field of industrial communications. RTU is a protocol that adopts serial communication method, which passes through interfaces such as RS -232 and RS -485. This allows one-to-one or many-to-many data transmission. TCP, which relies on Ethernet for data transmission, is quite different from the two. The RTU transmission rate and other things will be limited. You know, it is usually only a few kilometers. TCP uses Ethernet and has a long and fast transmission distance. Let's talk about this RTU

RTU has its unique frame format, and each frame contains the content of address or something. The address can be uniquely identified by the slave device address to find the correct communication, for example, we need to find a specific slave number. CRC verification must also be mentioned. Why do I need crc verification? Make sure all received data are accurate. When configuring RTU, details such as baud rate are very important. If the baud rate does not match, the signal will definitely be transmitted in a mess. There is also a transmission medium to be said about RTU. I just mentioned that using RS -232 and RS -485 interfaces generally speaking, RS -232 is suitable for close-range scenarios, and the maximum is 15 meters, such as in a small control cabinet. In contrast, RS-485 can realize remote communications above kilometers, which is particularly suitable for large-scale control projects in factory parks. And RS-485 allows multiple devices to be connected to the same bus

Let’s take a look at this powerful TCP. Let’s talk about this interface and port Modbus RTU/TCP first. TCP communication uses these standard ports. TCP 502 ports. Most devices use it by default. When communicating, we need to pay attention to whether this port is open. Its communication mechanism is quite intelligent and can quickly transmit data to a large scale for network data transmission. It is a strong point. So the configuration is different because when setting TCP on the network, the IP addresses must match the network environment. If you want to build a TCP network, you must set the DHCP settings in the gateway, for example, it is a problem that the gateway does not adjust the packet delivery properly. If you have some special circumstances in the data structure, you should know. In reality, sometimes when you receive some long strings of data, some short data, or when you encounter difficulties in processing negative numbers, how to analyze them carefully. The data structure of TCP is very rigorous. You can refer to standard documents to study and process specific things such as the location of each data and how to determine the data type. Then convert it into the value you want to understand, view, and process.

So how to distinguish the application scenarios of these two protocols. It depends on the specific project, such as small collection monitoring systems. If there is no large requirement for network speed, you can use this data collection volume. For example, some small environmental detection stations, you can consider that RTU is more affordable and economical. In a large integrated system in complex industrial links, equipment in smart factory environments requires frequent and large-scale communication to operate and respond in real time, and TCP must be used to handle it quickly. So how can we judge whether the equipment is good or bad based on these two protocols? The RTU protocol equipment is cheaper, but the performance is a little worse. So the tcp protocol equipment is expensive, and it is very scalable. It is very flexible. This is the difference between good or bad. Compare it.

In the application process of these protocols, you actually need to fully think about their own characteristics, specific functions, and other constraints, and then make a comprehensive and comprehensive plan. For users, you should understand the details of the two protocols more and more. Flexible handling of the specific situation. The difficulties in the specific situation can bring great convenience to the project implementation. Only then can you be happy. Of course, there are better intelligent product procurement requirements, such as weak current intelligent procurement, you can go to this and see if there are good global procurement services. I recommend it from my heart.