Industrial control motherboards generally use low-power chipsets to save energy and improve adaptability to the environment; Today, let's learn from Zhun Qin intelligence how to test the serial port failure of industrial control motherboard:

  Software operation method:

   I. short the 2 and 3 pins & 40 of the serial port with the jumper; The wide side of D-type interface has 2 or 3 pins from the right or top, and there is a small identification at the bottom of the pin); PC104 motherboard.

  2. Turn on the computer, enter the operating system, and click Start - all programs - Accessories - Communication - HyperTerminal; Set up HyperTerminal. In the pop-up connection description window, enter any name and click OK.

   3. In the pop-up "connect to" window, select the port to be used during connection (i.e. the port to be tested), and click "OK".

  4. In the pop-up COM1 attribute window, click restore to default - OK.

   5. Input any character on the keyboard and check whether the super terminal can display the input character. If there is no echo, the serial port to be tested is disconnected.

  test instructions of industrial control motherboard:

   by default, the characters entered by the HyperTerminal will not be displayed on the screen. The characters received by the port to be tested should be displayed here. If you remove the jumper, you will find that the input characters will no longer be displayed.

   therefore, in this way, as long as you see the echo character on the screen, it means that the serial port transceiver function of the embedded motherboard is normal! If not, of course, there is a problem with the serial port.