Programming Examples - Keithley DAC-02 User Manual

Programming Examples

The following example shows how to output data in BASIC. The example
is in BASIC but translates readily into other programming languages.
Since the DACs have 12-bit resolution, data D should be in the range 0 to
4095 decimal. First, split the data into the two bytes DL% (low) and DH%
(high), as follows:
05 DH% = INT(D/16)
10 DL% = D - 16*DH%
20 DL% = 16* DL%
30
Next write the data to the DAC. The example uses DAC 0 with a base
address of 300h.
40 OUT &H300, DL%
50 OUT &H301, DH%
An assembly language routine is even simpler. Assume AX contains the
data and DX has the base address. Use the following statements to write
to DAC 0:
MOV CL,4
SAL AX,CL
OUT DX,AX
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'Generate high byte
'Derive remainder in low byte
'Shift low nibble four places
' left
'Low byte
'High byte and load
;Set up for four left shifts
;Left justify data
'Write to DAC 0
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