At present, the development of the machine vision industry presents a prosperous scene, and the actual application scenarios are extending towards the direction of intelligence and refinement. On the whole, the continuous and stable operation of machine vision equipment and the accuracy of data need to be guaranteed in terms of usage requirements.
In the visual inspection scheme, "industrial camera<—>connection cable<—>image acquisition card<—>industrial computer", such basic connections constitute the main items of the machine vision system. For such a basic structure, let's discuss how to ensure the accuracy of image acquisition and data transmission in the visual transmission scheme of GigE interface equipment with a transmission rate of 10G.
In terms of industrial cameras, the application requirements of lithium batteries, photovoltaics, rail transit and other industries have prompted GigE cameras to develop in the direction of high resolution, high reduction, and high speed. The transmission rate is moving towards 2.5G, 5G, and 10G. Industrial cameras themselves , transmission cables, image acquisition cards and industrial computers have put forward new requirements.
In visual inspection applications, GigE Vision standard industrial cameras use UDP transmission protocol for data transmission, and GVCP (GigE Vision Control Protocol) and GVSP (GigE Vision Streaming Protocol) are also used on it. The addition of the two guarantees It ensures the integrity and reliability of UDP data transmission. This means that at the beginning of its establishment, GigE Vision designed and adopted a solution to ensure data transmission at the application layer, which can better optimize the resources of industrial computers to ensure more stable operation of industrial cameras and machine vision-related software programs. In addition to the UDP protocol, there are also industrial cameras that use the TCP protocol to transmit data.
Industrial cables are an essential component for connecting industrial cameras. In 10G high-speed transmission, 10G Ethernet cable standards are generally followed, that is, cables whose specifications cannot be lower than Cat6. In harsh application scenarios, it is recommended to use Cat6A or even Cat7 cables, such as LR-LINK's high-flexibility 10 Gigabit industrial camera network cable, which has high impedance, tensile resistance, high-speed stability, wear-resistant and flame-retardant, and screw fixing And other characteristics, so that in the process of visual inspection, the transmission data signal is not easily disturbed by the outside world, and can ensure that the image data is completely transmitted.
The image acquisition card is a key component of the industrial computer connected to the industrial camera, and its stable operation without frame loss becomes its key element. Jumbo frames have a great impact on the operation of GigE Vision equipment. A jumbo frame refers to an Ethernet frame whose payload exceeds the limit of 1500 bytes in the IEEE802.3 standard. The increased payload helps to improve link utilization and help devices obtain better network performance.
Generally speaking, the jumbo frame length of a conventional image acquisition card is about 9014 bytes, while the LR-LINK Jumbo Frame Series products reach a super jumbo frame of 16348 bytes, which reduces bandwidth occupation and network overhead, reduces CPU occupancy, and greatly Improve data transmission efficiency and provide higher Ethernet performance for the stable operation of 10G equipment. In addition, jumbo frame series products can carry larger payloads, and have significant advantages in large-capacity image data processing, which can help users solve the problem of frame loss, so that image data can be transmitted stably and completely even in high-speed networks .
In the application, choosing a suitable image acquisition card does not mean peace of mind. To achieve high-speed, stable and reliable data transmission, we also need to optimize the settings of the image acquisition card to achieve the best performance and ensure image acquisition and data. Integrity of transmission.
So, how do we operate to complete the optimization settings? In the next issue, we will use the LR-LINK 10G high-speed image acquisition card to optimize the setting operation and demonstrate the specific operation steps for you, so stay tuned.