What is a serial cable? What should I pay attention to when using it?

Are network cables and serial cables the same? I believe many people will have this question. Network cable is a data transmission line composed of multiple groups of pairs, such as common telephone lines, etc., which is mainly used in switches. UPlink port is connected to switches or hubs, and is connected with crystal connectors, while serial port cable is an expansion interface using serial communication, usually referred to as COM interface. At present, 9-pin serial ports are commonly used, referred to as DB9 and 25-pin serial ports, referred to as DB25.

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Serial cables are also divided into straight and cross. The straight cables are generally used to extend or connect PCs and devices. The ones on PCs are generally male, and the ones on devices are generally female. The pin-shaped connectors are male, and the hole-shaped connectors are female, so they can be used universally. Cross-shaped connectors are used for PC and PC docking. Most of the two ends are female. The difference is that the pins at both ends are connected in different ways. Straight serial cables connect x pin to x pin, such as the first pin at one end connects the first pin at the other end. Serial cables are divided into these two types because there are two different serial devices, one is data terminal equipment (DTE) and the other is data communication equipment (DCE), which receive information on different lines. Therefore, when choosing, you should choose according to the actual situation of the connection between the two devices. Everyone engaged in the electronic industry should know RS232. RS232 serial cable is widely used. It is used for serial communication between devices, but the connection method depends on the situation. RS232 is DB9 pin. Row of 4 stitches (facing down): 6789 from left to right for male and 6789 from right to left for female. We need to pay attention to several points when serial port debugging: 1. Different encoding mechanisms cannot be mixed. For example, the commonly used RS232C cannot be directly connected to the RS422 interface, and various converters on the market must be connected through the converter. 2. Debugging tools prepared when debugging will have twice the result with half the effort, such as using serial port debugging assistant, etc. 3. It is recommended not to unplug the serial port with power, which is easy to cause serial port damage. 4. For large measuring equipment, it is recommended to use an optocoupler to isolate the device. 1. Buy a brand USB serial cable. The driver is stable and the quality is guaranteed. 2. Correctly install the serial port driver. 3. Use a USB socket fixedly, because different USB sockets need to reinstall the driver, and the serial number will be different. If the driver fails, you need to unplug the USB serial cable

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