ICP DAS USA A-626 User Manual page 41

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A-626/A-628/A-726
ISA Bus, 6-/8-ch Analog Output and 16-ch DIO Board
Calculation:
Unipolar :
VD = 2050 (Dec.)
High Byte = 8 , Low Byte = 2
Output Range : 0 ~ 5 V
Voltage Output = 5 (V)X 2050 / 4095 = 2.503 (V)
Bipolar :
Coveted Data = 1024 (Dec.)
High Byte = 4 , Low Byte = 0
Output Range = 10 V
Voltage Output = 5 (V) X (1024-2048)/2048= - 2.4926 (V)
Current Loop:
Coveted Data = 3076 (Dec.)
High Byte = 12 , Low Byte = 4
Output Range = 4 ~ 20 mA
Current Sink = ((20-4 ) X 3076/4095 )+ 4=16.0185 (mA)
Example Program : ( Quick Basic)
BasAddress=&H2C0
RefVol=5
Vo = 3.5
Vd = int(Vo*4095/Refvol)
HighByte = int(Vd/256)
LowByte = Vd - HighByte*256
OUT ( BasAddress + 0 , HighByte)
OUT ( BasAddress + 1 , LowByte)
VD = High Byte x 256 + Low Byte
Converted Data
' A-626/628/726 Base Address
' Reference Voltage = -5 V ( Unipolar 0 ~ 5 V )
' Output 3.5 V
' Conversion Binary Data
' High Byte Data
' Low Byte Data
' Write high byte data first
' Then low byte data to D/A channel 0
User Manual/ Ver. 1.4/ Jun. 2013/ IMH-005/ Page: 40