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You can only test ONE CABLE at a time

Step 1 - CHIP TEST

Plug in the cable into your computer (we will use Windows)

Go to the Device Manager (From the Start Menu, select Settings→Control Panel. Double click on System and select the Hardware tab. Then click on the Device Manager button)


When plugging in a USB cable, the window will refresh and you will see USB Serial Port (COMx)

If the new COM port doesn't show up, there is a problem with the cable


This is the end of your FTDI Cable

We added breakout wires to make it easy to measure voltages

Test voltage between black and red wires - it must be 5V

Test voltage between black and orange wires - it must be 3.3V

Communication test

Download X-CTU:

Install software

Start up software

Select the COM port that says USB SERIAL PORT

Click on TERMINAL tab

Test RX and TX

Test TX is not shorted to RX

FTDI cable has nothing attached to it

Type text into terminal window. All text should be blue

When done, click Clear Screen

Test RX and TX

Connect 100 ohm resistor between orange and yellow wires

Type text into terminal window, all characters will appear in blue AND red

Test CTS

/home/ladyada/public_html/wiki/data/attic/ftditest.1281114204.txt.gz · Last modified: 2016/01/28 18:05 (external edit)