Measurement-computing DAQFlex User Guide Uživatelský manuál stáhnout pdf (Strana 42)

DAQFlex Software User's Guide DAQFlex Message Reference – Programming messages – AISCAN

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.

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