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The Difference Between The Serial Cable And The USB Cable

Estar Industrial Group Co.,Ltd | Updated: Aug 02, 2017

  The difference between the serial cable and the USB cable

  Transmission restrictions and the difference between the length of the bar, of course, the interface is also a big difference

  Serial port is called the serial interface, and now the computer generally has two serial ports: COM1 and COM2. You can see the back of the computer 9-pin D-shaped interface is it, and sometimes we call it RS-232 interface (pictured). USB cable There are a lot of mobile phone data lines or logistics receivers are COM port connected with the computer.

  Universal Serial Bus referred to as USB, is currently on the computer application of a wide range of interface specifications, USB interface is a computer on the motherboard of a four-pin interface, which the middle of the two needle transmission data, two pins on both sides to the peripheral power supply. USB interface speed, simple connection, no external power supply, while the external has a good compatibility, up to 127 peripherals can be connected. USB has two specifications, namely USB1.1 and USB2.0.

  USB interface can be connected to speakers, modems (Modem), digital cameras, monitors, joysticks, scanners, mouse, keyboard and other peripherals, making these peripherals can be hot-swappable, that is not shut down USB devices.

  Interface Type:

  RJ-45 interface is the most commonly used Ethernet interface, RJ45 is a common name, refers to the IEC (60) 603-7 standardization, the use of the international connector standard definition of the 8-position (8-pin) module Jack or plug.

  RS-232 interface (also known as EIA RS-232-C) is the most commonly used a serial communication interface. It was developed in 1970 by the American Electronics Industry Association (EIA) joint Bell system, modem manufacturers and computer terminal manufacturers to develop a standard for serial communication. USB cable Its full name is the technical standard for serial binary data interchange between "data terminal equipment (DTE) and data communication equipment (DCE)" This standard specifies a 25-pin DB25 connector for each of the connectors The signal content of the foot is specified, and the voltage of each signal is also specified.

  USB Universal Serial Bus is a new type of peripheral interface standard initiated by Intel, Microsoft, Compaq, IBM, NEC, Northern Telcom and several other major vendors. USB cable speed of 12Mbps, the latest USB2.0 up to 480Mbps; cable maximum length of 5 meters, USB cable has four lines, two signal lines, two power lines, USB cable can provide 5 volt power supply, USB cable is also divided and unshielded Two, shielded cable transmission speeds of up to 12Mbps, the price is more expensive, non-shielded cable speed of 1.5Mbps, but the price is cheap; USB through the series can be up to 127 devices in series; support plug and play and hot swap.

  The difference between serial and parallel port:

  The serial port describes what is a lane, USB cable and the parallel port is 8 lanes at the same time to send 8 (one byte) of data.

  But not parallel fast, due to interference between the 8-bit channel. Transmission speed is limited. And when the transmission error, USB cable to re-transmission 8-bit data at the same time. Serial port without interference, transmission error after a retransmission on it. So faster than the parallel. Serial hard drive is so people pay attention to.

  Switch serial port:

  The switch is the serial port of the English trunk; USB cable is used to do the next hop routing conversion. No VLAN only with the TRUNK after the route to the external network


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