How is serial interfacing done in labview

how is serial interfacing done in labview

well i would like to send a command A0H to digital video recorder and recieve acknowledgements at serial port. in order to recieve i am calling the visa read function. but i am recieving no response of acknowledgement string.
well i am able to send eject command (2AH)successfully, but i am not recieving any response string from digital video recorder
i am using digital video recorder DSR-20/20P.
moreover when i call read vi for time code request, i get error message (-1073807339). may be the read function i am calling is not the right one?
i am sending my source code. can u correct it please.
Attachments:
serial_port_digital_recording.vi ‏51 KB

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Advice on constructing a test engine and formatting a spreadsheet test file to perform command line interface testing on a product through telnet or serial interface

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