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NIDisk User Guide

will acquire two channels for 60 seconds at 50 kHz sample rate per channel with a gain

multiplier of 10, to a two-channel SIGNAL-format sound file called myAcqFile, while

simultaneously playing the sound file myPlayFile.

If the filename or filename prefix includes embedded spaces, enclose the entire name in

quotation marks, for example:

nidisk a 2 60 50000 10 s "\my project\myfile"

Calling NIDisk from SIGNAL

NIDisk can be called from SIGNAL using the EXEC command. Include the full pathname of

the NIDisk executable, and enclose this in quotes if it contains embedded spaces, as in the

example below. Two applications are: 1) enclosing NIDisk in a SIGNAL program loop to

automate and time repetitive playbacks (using DOLOOP and TWAIT), and 2) using TWAIT

to run NIDisk at a particular time of day, for scheduled recording. The following example

(which should be presented on a single line) will perform the acquisition described above:

EXEC "c:\Program Files\Engineering Design\Signal 4.0\nidisk"

a 2 60 50000 10 s "\my project\myfile"

Calling NIDisk from DOS

A NIDisk command can also be run from a DOS batch file. This avoids entering parameters

manually into the parameter setup screen, to perform the same process repeatedly. Create a

one-line .bat file containing the command line text, such as "nidisk a 2 60 50000 10 s myfile"

without the quotes. Then either 1) double-click on this file in Windows Explorer, or 2) open

a DOS window (in the Start menu, click Programs | Accessories | Command Prompt) and

type the .bat file name.

Status File

NIDisk writes acquisition and playback status files to enable communication with a calling

program. These files are called NIDiskAcqStatus.txt and NIDiskPlayStatus.txt, and are

located in the NIDisk program directory. These files contain one line in the format

status=status

where status is the status of the current or just-completed I/O process:

ACTIVE = in progress

DONE = successfully completed

ABORTED = aborted by the user

ERROR = terminated by the program due to error

Normally, status will be ACTIVE during acquisition or playback and DONE after the I/O

process completes. The user can call NIDisk from SIGNAL, then poll the status file (using

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