D/A Conversion Data - Toshiba AD268 User Manual

PART 2 DA264

5.2 D/A conversion data

To output the desired analog signals from the DA264, simply write the appropriate data into the
assigned I/O registers YW(n) to YW(n+3) for the DA264.
The data of YW(n) to YW(n+3) are transferred to the DA264 at the T2's batch I/O processing.
Then in the DA264, these D/A conversion data are converted into the analog signals and
output from the DA264.
The I/O register assignment is as follows.
YW(n) ........ D/A conversion data for channel 1
YW(n+1) .... D/A conversion data for channel 2
YW(n+2) .... D/A conversion data for channel 3
YW(n+3) .... D/A conversion data for channel 4
The conversion data to be written into the YW register is dependent on the output type as
follows.
10V range:
Upper limit
Full scale (positive)
Full scale (negative)
Lower limit
Analog output value
H8000
-32768
-10V
H8300
-32000
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D/A conversion data
Hexadecimal
H7F80
:
H7D00
:
H0001
0 H0000
HFFFF
:
H8300
:
H8080
+5.1196V
HC000
-16384
0
H3FFF
16383
-5.12V
5. I/O Allocation and Programming
Output voltage
Integer
32640 +10.2 V
:
32000 +10 V
:
1 +0.3125 mV
0
-1 -0.3125 mV
:
-32000
:
-32640 -10.2 V
H7D00
32000
+10V
Digital data
H7FFF
32767
Resolution
:
:
0 V 0.3125 mV / bit
:
-10 V
:
A = 0.3125 D
D: Digital data
A: Analog signal (mV)
User's Manual
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