Creating a Loopback for Testing
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:
|•||Connect the DS to the network, and using DS Manager, set RTS/CTS Flow Control to Disabled or remote.|
|•||Follow the steps laid out on Establishing a TCP/IP Connection with a Device Server and create a connection with your DS from HyperTerminal.|
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.