NuDAQ PCI-6308 Series, Руководство пользователя

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18
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Operation Theorem
When the applications use smaller voltage range, the PCI-6308 can
still be applied. For example, if the application voltage range is uni-
polar 0~5V, the user just need to set jumper to external reference
mode, supply 5V from CN1 connector.
For +/-10V mode:
Digital Value HEX value Output Voltage
4095 0xFFF +9.99969V
2048 0x800 0.00000V
0 0x000 -10.00000V
For 0~+10V mode:
Digital Value HEX value Output Voltage
4095 0xFFF +9.99969V
2048 0x800 5.00000V
0 0x000 0.00000V
For 0V ~ Vuser mode:
Digital Value HEX value Output Voltage
4095 0xFFF +Vuser
2048 0x800 +Vuser/2
0 0x000 0.00000V
Table 4.1 DA Voltage Output Format
The following table shows the address of every analog output ports
relative to the base address. Note that the base address is assigned
by the PCI BIOS. The current output control of the PCI-6308A is
described in Section 4.3.
4.2 Analog Output Status Register
The DAC is with series bus hence it takes times to send digital value
out. The data transfer time for every DA data write takes 16
µ
s,
therefore the software driver must wait for 16
µ
s before send another
data to any analog output port. While the DA value is sending, the
Data_Send bit is
‘
H
’
. The software driver should check this bit before
write any data to output port. This register is read only.
Base D16~D1 D0
0x00 X Data_Send