How to test the serial and serial line is normal

One step: Plug the serial line or USB to the serial cable into the computer.

Step two: Open the serial debugging assistant

Then select the serial port, serial line and USB to port port number to view the path:

On the computer--right--Properties--hardware--Device Manager-ports (COM and LPT), point

You can view the + number in front of the opening.

Note: 1, usb-serialch340 (COM4) is the port number of USB to serial port 2, communication port (COM1) is the port number that the computer originally comes with

Step three: Set up the serial debugging assistant (see)

1, serial port: COM4 is and serial line or USB to serial line in the above path to see the port number.

2, the character/data sent: The image of the input is 59, you can enter the 2-digit random number.

3. The rest of the settings follow.

The use of short-circuit or wire, tweezers and so on, no electricity, hand touch are all right.

4, short-connect serial line or USB to serial cable 9-pin 2 and 3 (pin base numbered, look carefully)

5, short after the completion, with the left mouse button click the serial debugging assistant on the manual send can see the following interface:

Conclusion: The data can be received once per click, which indicates that the serial port and serial line are normal.

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Test MAX232 Circuit

1. Connect the serial line and the power cord to the minimum system board. Power switch button do not power the board, open the serial debugging assistant, and press settings:

2, then short connect P3.0 and P3.1 jump needle, to the minimum system board power, at this time click Manual Send, receive area can receive data.

3, to this point, can be described MAX232 part of the circuit normal.

4, at the same time can be tested by multimeter MAX232 voltage signal generated by the verification. MAX232 2 feet to the ground is +10v around, 6 feet to the ground is about -10v, 16 feet is about 15 feet grounding

  

How to test the serial and serial line is normal