The loopback test is a diagnostic process that involves transmitting a signal and receiving it back. For this reason, loopback tests are often used to debug problems with a physical connection or fiber optic network. It also helps identify any problems with the hardware, cable, or software that is causing the failure. If one of the signals is not sent back to the other, then the test is considered a failure. It involves sending a digital data stream and receiving it back. Specify the transceiver mode based on the one you want to use.A loopback test is a common procedure used in telecommunications, particularly fiber optic networks.To locate the example, open LabVIEW and navigate to the Help tab > Find Examples > Hardware Input and Output > Serial > RS-485 Transceiver Control.vi.If you are using RS-485 (2-wire), test communication with the shipping example RS-485 Transceiver Control.vi. The Respond indicator should display the *IDN?\n command.Ensure the proper VISA resource name is selected and the serial settings are correct.To locate the example, open LabVIEW and navigate to the Help tab > Find Examples > Hardware Input and Output > Serial > Simple Serial.vi. The Test Panel should successfully read the sent *IDN?\n command.įor both RS-232 and RS-485 (4-wire), test communication with shipping example Simple Serial.vi.
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