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di_anout is an immediate function that writes (outputs) a 2's complement, left justified value to the DAC.
Note: The di_anout function will be ignored while output scanning or simultaneously input and output scanning.
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int di_anout (dac_data, range); |
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unsigned dac_data; |
/* value to ouput to the DAC */ |
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unsigned range; |
/* specifies which DAC to write to OR unipolar/bipolar (22x products) */ |
The value that gets written to the DAC is instrument dependent.
| 12-bit: | DI-158, DI-220, DI-221, DI-222 | |
| 14-bit: | DI-400, DI-410, DI-500, DI-510,DI-720, DI-730, DI-78x, and DI-5001 |
See Converting Counts to Volts.
range specifies which DAC to write to or, for DI-220, DI-221TC, and DI-222 instruments, bipolar/unipolar operation.
| DI_NO_ERR | No error |
| DI_OPENED_ERR | Device not opened |
| DI_COMM_ERR | Communication error |
| DI_ANOUT_ERR | Analog output error |
Note: If di_close is called immediately after di_anout, the device will close before di_anout is completed.
Use the following tables for reference.
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#include "200sdk.h" |
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int i; |
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char errstr[255]; |
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main() |
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{ |
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if(errcode = di_open()){ |
/* open the device for comm */ |
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di_strerr(errcode,errstr); |
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printf("%s",errstr); |
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} |
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else |
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printf("Device installed successfully.....\n"); |
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i = 5 . 16; |
/* this left justifies the data */ |
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i = i & 0XFFFC; |
/* the lower 2 bits should be zero */ |
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if(errcode = di_anout(i,0)){ |
/* output i to DAC */ |
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di_strerr(errcode,errstr); |
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printf("%s",errstr); |
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} |
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else |
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printf("Analog output successful.....\n"); |
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di_close (); |
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} |
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Copyright © DATAQ Instruments, Inc.
DI-158