Wiring harness manufacturers tell you what is the serial port cable? What should I pay attention to when using it?

Are net and serial cables the same? I believe that many people will have such a question, the network cable is composed of multiple pairs of data transmission lines, such as ordinary telephone cables, etc., mainly used for switches, UPlink port connected to the switch or hub above, and connected to the crystal connector, while the serial port cable is to extend the serial communication interface, usually refers to the COM interface, the more commonly used is the 9-pin serial port, referred to as DB9, 25-pin serial port, referred to as DB25, 25-pin serial port, referred to as DB25. Serial cable is also divided into straight-through and crossover, straight-through is generally used to connect the PC and the device, the PC is generally used to connect the male header, the device is generally used to connect the female header, with a pin connector to connect the male header, with a hole in the connector to connect the female header, and can therefore be used universally, crossover is used to connect the PC and the PC's docking, the two heads of the female header, the difference between them is that the pin on the two sides connected to a different way. The way is different, straight-through serial line connects x-pin to x-pin, for example, PC and PC's 1st pin connection to the other end of the 1st pin, twisted pair, transmission line and receiving line to twisted pair, for example, PC and PC's 4th pin connection of the 5th pin connection. As there are two different serial devices, one is a data terminal equipment (DTE), the other is a data communications equipment (DCE), they receive information on different lines, so when making a choice, should be based on the actual situation of the two devices connected to each other.RS232, this serial line is very versatile, it is used to carry out serial communications between the devices, but the method of connection needs to be based on specific circumstances Depending on the RS232 is DB9 header, here is a brief description of his plug definition, side up, a row of 5 pins (up): male header from left to right 12345, female header from right 2 to left 12345. 4-pin arrangement (facing down): male header from left to right 6789, female header from right to left 6789.

When the serial port debugging, you need to pay attention to the following points: 1. Different coding mechanisms can not be mixed, such as the commonly used RS232C interface can not be directly connected to the RS422 interface, and a variety of converters available on the market, be sure to connect through the converter.2. Debugging should be prepared to use the debugging tools, can play a multiplier effect, such as using the serial port debugging assistant, etc. 3. It is recommended that you do not With electricity to pull the socket of the serial port, which is easy to cause damage to the serial port, which must be noted. 4. For large-scale measurement equipment, it is recommended that the use of optocouplers to isolate the device. USB to serial line when to pay attention to what issues: 1. Purchase a brand of USB serial line, stable transmission, quality is also guaranteed. 2. Correctly install the driver for the serial line. 3. Fixed to use the USB socket, because replacing a different USB socket need to reinstall the driver, if the driver does not work, you need to unplug the USB serial cable and plug it in again, and the serial port number will be different.

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