參數(shù)資料
型號(hào): PCI-ADC
英文描述: MULTIFUNKTIONSKARTE 44 KANAL PCI BUS
中文描述: MULTIFUNKTIONSKARTE 44卡納爾PCI總線
文件頁(yè)數(shù): 23/35頁(yè)
文件大?。?/td> 124K
代理商: PCI-ADC
Chapter 3
Programming Details
Page 15
Blue Chip Technology Ltd.
01270193.doc
Page 15
Analogue Output Control Register
(Base 2 + 0B
h
) Read/write
Function
Bit no.
b7..b4
Not used
b3
Channel 3 output format :-
0 = Constant voltage
1 = Constant current
0 = Constant voltage
1 = Constant current
0 = Constant voltage
1 = Constant current
0 = Constant voltage
1 = Constant current
b2
Channel 2 output format :-
b1
Channel 1 output format :-
b0
Channel 0 output format :-
The output voltage is an offset binary version of the input data, i.e. the output
voltage will be
-10 volts for an input code of 0000
h
,
zero volts for an input code of 07FF
h
,
+10 volts for an input code of 0FFF
h
.
When set to current output mode the corresponding outputs are
-20 mA (0000
h
),
0 mA (07FF
h
),
+20 mA (0FFF
h
).
On power up or card reset, the output voltages will automatically reset to zero
volts (0 mA).
Digital I/O
The board’s digital input/output facilities are provided by an Intel i8255, or
NEC μPD71055 PIO device (compatible with the Intel part) and an Intel i8254,
or NEC μPD71054 Counter/timer (compatible with the Intel part).
The i8255 / μPD71055 PIO and i8254 / μPD71054 Counter/timer ICs are
complex devices. For full details on how to program these devices, refer to the
manufacturer’s data sheets. Presented here is a brief summary of the main
features of each.
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