:
iReturnValue :
- 0: remote function performed OK
- -1: an system error occured
- -100: Get analog output status kernel function error
ulStatus : Status information
- 0: ready to receive a new value
- 1: waiting for a trigger
- 2: output not available (diagnose problem or other conditions hindering normal functions)
ulInfo : reserved
syserrno : system-error code (the value of the libc "errno" code)
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