How to perform a loopback test to test a serial communication system using Tera Term, With or without a Lantronix box

Question

  • How do you perform a loopback test with Tera Term to test a serial communication system?

Environment

  • Product Family: Message Displays
  • Product: Galaxy, Galaxy Pro
  • Component: Lantronix box, Serial communication equipment
  • Control System:

Answers/Steps

  • If Tera Term is not installed, it can be downloaded and unzipped by clicking on the link below:

Loopback - No Lantronix Box

  1. Open Tera Term and select the Serial radio button.
  2. Select the appropriate COM port from the drop down box and then press OK.
  3. The default Baud Rate of 9600 and other COM port settings can be used for loopbacks (Baud Rate of 19200 is used to see incoming RTD data).
  4. With the loopback in place (RX & TX jumpers), type some characters into to Tera Term and see if you can see what you type; if you can, the loopback is passing (good signal up to that point).
    • The location of the loopback will be determined by what serial communication method is being used. See Related Articles below.
       
  5.  

     

Loopback with Lantronix Box

  1. Open Tera Term and select the TCP/IP radio button
  2. Type in the correct IP address (default IP for Daktronics' Lantronix boxes is 172.16.192.24)
  3. Select Other from the Service selection categories
  4. Type in the TCP port # (3001 should normally be used) and the press OK (the Protocol shouldn't need to be specified)
  5. With the loopback in place, type some characters into to Tera Term and see if you can see what you type; if you can, the loopback is passing (good signal up to that point)
  6. Need to jumper pins 2 (TX) and 3 (RX) on 25 pin plug/RS232 output of Lantronix box. As you look at pins they number right to left 1-13 on top,14-25 on bottom of plug.


Related Article

The type of serial of communication you are using will determine where you test. Below are some helpful articles for different types of communication.

Note: If the computer has Windows XP see How to perform a loopback test with HyperTerminal, DD1994747.

KB ID: DD2331527


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