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Various Errors Using Channels 8 and 9 on the AT-AO-10

Hardware: Legacy DAQ Devices>>Analog Output>>AT-AO-10

Problem: Channels 8 and 9 on the AT-AO-10 are handled differently than channels 0 through 7, and this difference can result in the following errors when improperly accessed:

In the Measurement & Automation Explorer (MAX) test panel, performing sine wave output on channels 8 or 9 results in the error -10453: The interrupt level is already in use by another device. Additionally, on Windows NT, instead of the error, there could be a crash or hang when testing wave output on channels 8 and 9 in MAX. Performing a single update on the channel does not cause the error.

Using high-level NI-DAQ functions (for example, WFM_Op) to perform waveform output on channels 8 and 9 causes various errors or even a crash or hang on some computers.

Solution: For this device, channels 8 and 9 must be configured in Group 2 if they are the only channels in a group. However, most high-level DAQ functions, as well as MAX, place the channel in Group 1, which causes the above problems. The solution is to perform waveform output on channels 8 or 9 using low-level functions that place the channel into Group 2. Also, you cannot just configure the channel in Group 2 and then call a high-level DAQ call, as the high-level call reconfigures the channel back into Group 1. To output a waveform from these two channels, use only the low-level functions. A typical sequence of these low-level calls is listed below:

WFM_Scale
WFM_DB_Config
WFM_Group_Setup
WFM_Load
WFM_Rate
WFM_ClockRate
WFM_Group_Control (Operation = Start)
WFM_Check (in a loop)
WFM_Group_Control (Operation = Clear)

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Report Date: 11/03/2000
Last Updated: 02/27/2002
Document ID: 23298RLS

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