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GPIB Warning - Unable to Read All Data

These remedies apply to the case when you receive some data and you get this warning message:

'gpib' unable to read all requested data

ASCII Data

When using the GPIB interface for:

  • Reading ASCII (text) data using thefscanf,fgets, orfgetlfunctions

these are possible causes and remedies:

Cause Solution
TheEOIModeproperty is not set correctly. Verify that theEOIModeproperty is set to the value required by your device. You can set it toonoroff, andonis the default. For more information about setting the property, seeWrite and Read GPIB Data.
TheEOIModeproperty is set tooff, but theEOSModeandEOSCharCodeproperties might not be configured to the same setting as the instrument. Verify that theEOSModeandEOSCharCodeproperties are configured to the same settings as your device. For more information about setting the properties, seeEOSModeandEOSCharCode.
Communication with the device was interrupted. Check your device connection. For more information about troubleshooting configuration and connection, seeTroubleshooting GPIB Interface.

Binary Data

When using the GPIB interface for:

  • Reading binary data using thefreadfunction

these are possible causes and remedies:

Cause Solution
Device did not send all the requested data. Check your device connection. For more information about troubleshooting configuration and connection, seeTroubleshooting GPIB Interface.
There was a data format mismatch. 验证设备的数据格式匹配specified read format. Data format is set using thePrecisionproperty. For more information about supported precisions, seefread.
The number of values to read was not specified and was set to theInputBufferSizeby default. Set the number of values to read using thesizeargument on thefreadfunction, or change theInputBufferSizeproperty. For more information about setting the property, seeInputBufferSize. For information about setting number of values to read, seefread.

Binblock Data

When using the GPIB interface for:

  • Reading binblock (binary-block) data using thebinblockreadfunction

these are possible causes and remedies:

Cause Solution
The timeout value might be too short for the amount of data being read. Increase theTimeoutproperty value. For more information about setting the property, seeTimeout.
Communication with the device was interrupted. Check your device connection. For more information about troubleshooting configuration and connection, seeTroubleshooting GPIB Interface.

More Troubleshooting Help

For more information about troubleshooting the GPIB interface, including supported platforms, adaptor requirements, configuration and connection, and other troubleshooting tips, seeTroubleshooting GPIB Interface.