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Communication lines generally use twisted-pair shielded lines, namely RVSP lines. When the transmission distance is short, ordinary network cables can be used. For long-distance transmission, using shielded twisted pair can improve the anti-interference performance. There are many communication interfaces that can be selected in the industrial field, such as serial port 232, 485, Ethernet, GPIB, USB, wireless, optical fiber and so on.
Standard serial port (RS232): suitable for simple communication lines, low cost, slow transmission speed, not suitable for long-distance communication. Most of them exist in industrial computers and some communication equipment.
GPIB: The biggest feature is that several instruments can be connected with one bus to form an automatic test system. The communication rate is low, mainly used to send control commands, and is suitable for laboratories or production sites with slight electrical interference.
Ethernet: The Ethernet interface, also known as the crystal head interface, is mainly used for the connection interface between the router and the local area network. However, there are various types of LANs, so this also determines that the types of LAN interfaces of routers may also be diverse. Different networks have different interface types. Common Ethernet interfaces mainly include AUI, BNC, and RJ-45 interfaces, as well as FDDI, ATM, and optical fiber interfaces. These networks have corresponding network interfaces.
USB: A very common interface type, the output voltage and current of the interface is plus 5V 500mA, and the maximum cannot exceed plus /-0.2V, which is 4.8-5.2V. The main function is to store the data in the device or to read and identify the external information through the USB interface.
Wireless: Wireless connection is a very important communication method in modern communication networks. It can be connected without a physical wire and has a fast transmission rate. It can connect the instrument to a wireless router, or connect to the WIFI hotspot of a mobile phone to form a network.
Multi-machine synchronization interface: Different from the functions of the above-mentioned interfaces, this interface is an interface designed by power analyzers to ensure that the number of channels can be increased at the same time. Connecting two instruments through a cable can test multi-channel models at the same time, which ensures the synchronization of signal testing.
