Advantech PCI-1724U Instrukcja Użytkownika Pobierz pdf (Strona 44)

PCI-1724U User Manual 36

C.2 DAC Control Register-0x00

PCI-1724U is designed for a 32-bit bus and will read all 32 bits at the

same time. Because the card can be addressed individually, knowing how

the PCI-1724U’s register works becomes a very important issue. There

are several channel groupings which enable you to simultaneously write

the same data to multiple DAC channels. Table C-3 shows the format of

the DAC control register.

C.2.1 D13~D0

PCI-1724U accepts a straight 14-bit parallel word on D13~D0 where D13

is the MSB and D0 is the LSB. See Table C-3.

C.2.2 REG1 (D15), REG0 (D14)

REG1 and REG0 determine the destination register of the data being

written to the PCI-1724U. This register provides three main categories:

normal mode, offset mode, gain mode.

If users do not want to change the setting status of calibration, select the

Normal Mode (REG1=1, REG0=1). If users want to calibrate in this

to calibrate through adjusting the value of REG1 and REG0. See Table C-

4, C-5.

Table C.3: DAC Control Register Trigger

Offset

Address

(HEX)

PCI-1724U Register Format

D31~D24 D23~D16 D15 D14 D13~D0

0x00

DAC Control Register

N/A Group/Channel

Select Bit

REG1 REG0 DAC Data

Code

RN/A

Warning! We strongly recommend that you use the calibration

utility provided in the CD-ROM to calibrate this card

instead of adjusting it directly in registers. Adjusting

REG1 and REG0 can result in some unexpected

problems due to the wrong settings.

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