The Measurement Computing driver for DASYLab 2016 uses the MCC Universal Library to communicate with supported devices.
MCC devices that support hardware-paced Analog Output require large buffers to prevent data underrun errors. The UL Help and the device specifications are often not specific enough to determine correct and optimal output buffers. This article provides a table of recommended buffer sizes for supported devices. The DASYLab driver uses the block size setting to determine the buffer that is allocated for Analog and Digital Output.
Note that the Analog Output and Analog Input use different hardware clocks for high-speed input and output on supported devices. You can configure the sample rates differently for each subsystem. If you want to connect the data from the Analog Input to a Analog or Digital Output, you either need to set the sample rates and block sizes the same, or you need to increase the block size for the Output modules using the Signal Analysis Data Window module.
Problem: underruns occur when a Measurement Computing DAQ device and a DASYLab output control module use different time bases that are not in synch with each other.
Set the Synchronization Time base option on the MCC output module to "Time base," and the Synchronization Time base settings option on the DASYLab output control to "<MCC Device> - Output HW."
When creating a new worksheet with DASYLab 2016, the output hardware timebase is selected by default on the MCC device. You must select the same output hardware timebase for the DASYLab output control module:
1. Double-click on the DASYLab output control module and click "Options."
2. Click the drop-down list under Time base settings and select the "<MCC Device> - Output HW" timebase.
When opening a version 13 worksheet in version 14, you must select the output timebase hardware for both the MCC hardware device and the DASYLab output control module:
1. Double-click on the MCC output module and click "Hardware."
2. Set the Synchronization Timing option to "Timebase."
3. Click OK twice and return to the worksheet.
4. Double-click on the DASYLab output control module and select Options.
5. Set the Synchronization "Time base settings" option to "<MCC Device> - Output HW" timebase."
6. Click OK twice and return to the worksheet.
To avoid data underruns, use the table below to select a block size for the
Analog Output-HW or Digital
Output-HW time base.
If this table does not help you, please contact us at MCC Support. You will need details of your DASYLab license (version, type, serial number), the version of the MCC-DRV driver, the version of the Universal Library/InstaCal and the exact model of the device that you are using.
| Device | Max AO Scan Rate | Default | 1000 -
10,000 | 10,000 -
50,000 | 50,000 -
100,000 | 100,000 -
500,000 | > 500,000 |
| PCI-2515 | 1MS/s | 150000 | 2500 | 8500 | 10000 | 24000 | 150000 |
| PCI-2517 | 1MS/s | 150000 | 2500 | 8500 | 10000 | 24000 | 150000 |
| PCI-DAS1001 | Software paced | 1024 | n/a | n/a | n/a | n/a | n/a |
| PCI-DAS1002 | Software paced | 1024 | n/a | n/a | n/a | n/a | n/a |
| PCI-DAS6014 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6025 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6030 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6031 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6035 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6036 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6052 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6070 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6071 | 1 MS/s | 1024 | | | | | |
| PCI-DAS6402-12 | 100KS/s/ch | 1024 | | | | | |
| PCI-DAS6402-16 | 100KS/s/ch | 1024 | | | | | |
| PMD-1208FS/USB-1208FS | 10 kS/s | 250 | | | | | |
| USB-1208FS-PLUS | 50 kS/s | 6500 | 1600 | 6500 | | | |
| USB-1208HS-2AO | 1 MS/s | 35000 | 5000 | 8500 | 10000 | 22000 | 35000 |
| USB-1208HS-4AO | 1 MS/s | 35000 | 5000 | 8500 | 10000 | 22000 | 35000 |
| USB-1408FS | 50 kS/s | 250 | | | | | |
| USB-1408FS-PLUS | 50 kS/s | 6500 | 1600 | 6500 | | | |
| USB-1602HS-AO | 1 MS/s | 48000 | 512 | 2100 | 3100 | 20000 | 48000 |
| USB-1604HS-AO | 1 MS/s | 48000 | 512 | 2100 | 3100 | 20000 | 48000 |
| USB-1608GX-2AO | 250 kS/s | 25000 | 3000 | 6000 | 8000 | 25000 | |
| USB-1608HS-2AO | 70 kS/s | 2600 | | | | | |
| USB-1616HS-2 | 1 MS/s | 150000 | 2500 | 8500 | 10000 | 24000 | 150000 |
| USB-1616HS-4 | 1 MS/s | 150000 | 2500 | 8500 | 10000 | 24000 | 150000 |
| USB-1808 | 500 kS/s/ch | 25000 | 2500 | 3800 | 7000 | 8000 | 25000 |
| USB-1808X | 500 kS/s/ch | 25000 | 2500 | 3800 | 7000 | 8000 | 25000 |
| USB-231 | 5 kS/s/ch | 2600 | | | | | |
| USB-234 | 5 kS/s/ch | 2600 | | | | | |
| USB-2408-2AO | 1 kS/s | 700 | | | | | |
| USB-2416-4AO | 1 kS/s | 1024 | | | | | |
| USB-2527 | 1 MS/s | 150000 | 512 | 2048 | 5000 | 25000 | 150000 |
| USB-2537 | 1 MS/s | 150000 | 512 | 2048 | 5000 | 25000 | 150000 |
| USB-2627 | 1 MS/s | 145000 | 3500 | 5200 | 7200 | 24000 | 145000 |
| USB-2637 | 1 MS/s | 145000 | 3500 | 5200 | 7200 | 24000 | 145000 |
| USB-DIO32HS | 8 MS/s | 38000 | 2500 | 8500 | 10000 | 22000 | 38000 |