Measurement Computing DAQFlex User Guide - Manual (Page 42)

DAQFlex Software User's Guide DAQFlex Message Reference – Programming messages – AISCAN
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AISCAN
Sets and gets property values when scanning analog input channels.
Refer to the device-specific information in the Hardware Reference section for the component properties
and commands supported by each DAQ device.
Properties
BUFOVERWRITE, BUFSIZE, BURSTMODE, CAL, COUNT, EXTPACER, HIGHCHAN, INDEX, LOWCHAN,
QUEUE, RANGE, RATE, RESET, SAMPLES, SCALE, START, STATUS, STOP, TEMPUNITS, TRIG, XFRMODE
BUFOVERWRITE
 Enable or disable buffer monitoring to prevent overwriting unread data.
Message
"AISCAN:BUFOVERWRITE=value"
Response "AISCAN:BUFOVERWRITE "
value ENABLE, DISABLE
Example "AISCAN:BUFOVERWRITE=ENABLE"
Note  DISABLE (default): Do not monitor the buffer – allow overwrite.
 ENABLE: Monitor the buffer and generate an error if unread data is being
overwritten.
 Get a value indicating whether the buffer is being monitored to prevent data overwrite.
Message
"?AISCAN:BUFOVERWRITE"
Response "AISCAN:BUFOVERWRITE=value"
value ENABLE, DISABLE
Note  ENABLE indicates that an attempt to overwrite unread data will generate an error
message.
 DISABLE indicates that no error will be generated when data is overwritten.
This message is processed by the DAQFlex Software library, and is not sent to the
device.
BUFSIZE
 Set the size in bytes of the buffer to be used for AISCAN.
Message
"AISCAN:BUFSIZE=value"
Response "AISCAN:BUFSIZE"
value The size in bytes of the buffer.
Example "AISCAN:BUFSIZE=131072"
Note  The default buffer size 1,024,000 bytes. This should be sufficient for most
applications. The actual buffer size will always be an integer multiple of the device's
maximum packet size.
 If this value is set, it should be at least (the number of bytes per sample) x (number
of channels) x (sample count) for finite mode. In continuous mode, a circular buffer
is used, so the size needs to be sufficient to allow reading the data before it is
overwritten.