ADLINK Technology NuDAQ ACL-8216, Руководство пользователя

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C/C++ Library
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5.10 _8216_AD_Set_Range
@ Description
This function is used to set the A/D range by means of writing data
to the A/D range control register. There are two factors will change
the analog input range- Gain and Input type. The Gain can be choice
from 1,2,4 and 8. The initial value of gain is '1' which is set by the
ACL-8216 hardware. The relationship between analog input range
and gain is specified by following tables:
Input
Range (V) Gain Range
Code
±
5 V X 1 0
±
2.5 V X 2 1
±
1.25 V X 4 2
±
0.625 V X 8 3
@ Syntax
int _8216_AD_Set_Range( int range_code )
@ Argument
range_code:
the programmable range of A/D
conversion, the possible values.
@ Return Code
ERR_NoError
ERR_BoardNoInit
ERR_AD_InvalidGain
@ Example
#include "8216.h"
main()
{
_8216_Initial( CARD_1, 0x220 );
/* Assume NoError when Initialize ACL-8216 */
_8216_AD_Set_Range( 1 );
printf( "The A/D analog input range is +/-5V.\n" );
…
}