Creating a Loopback for Testing
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A loopback connection is one where the signal being sent also comes back to the sender -- similar to an echo. This allows you to test a line (including the devices on it) to verify its correct operation.
Creating a loopback with a Device Server is rather simple. You just have to make sure you're working on RS232 (if your Device Server is also capable of other serial protocols) and connect serial pin #3 (TX, output) to serial pin #2 (RX, input), like so:
For this setup to work:
Now, anything you will send will get back to you. Just type, and see what you type on the screen. To confirm that this is indeed a loopback, just disconnect pin #2 from pin #3 on the DS, and you'll no longer see what you type.