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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.
LOOPBACK CABLE TV SYSTEM SERIAL
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. The display window will then outline the write and read operations.In the Basic I/O tab, select Query to send the default *IDN?\n command.Once the Test Panel window has opened, select Input/Output.In MAX, select the communications port of interest and select Open VISA Test Panel.
LOOPBACK CABLE TV SYSTEM CODE
Make sure not to have VISA Test Panels and LabVIEW simultaneously open, or VISA will throw an access resource error (error code -1073807246 hex:0xbfff0072). Note: You can test communication in MAX VISA Test Panels or LabVIEW examples.
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If you are unable to see the port, refer to Serial COM Ports Missing in MAX or LabVIEW. Select the communications port of interest under Devices and Interfaces.Open Measurement and Automation Explorer (MAX) from the Start menu.It is not recommended to use the RJ-50 connector by itself to perform a loopback test due to the small separation between pins. If you use a RJ-50 to DB-9 serial cable (Part Number 182845-XX), a loopback test can be performed using the pins for a DB-9 connector. The positive connections are indicated in red, the negative connections are indicated in blue, and the GND connections are indicated in green. Refer to the pins below based on your connector type.
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