Acces PCIe-DA16-6, Руководство пользователя

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Manual PCIe-DA16-6 13
External Interrupt is a negative edge at pin 25 and is latched until cleared by a read of
Base A4. The interrupt is enabled by a read of Base 3 and powers up
disabled. After being cleared the interrupt must be re-enabled.
Address hex Write Read
Base + 0 DAC 0 Low Byte Place card in Simultaneous Mode without updating outputs.
Base + 1 DAC 0 High Byte
Base + 2 DAC 1 Low Byte Release card from Simultaneous Mode without updating outputs.
Base + 3 DAC 1 High Byte Enable Interrupts
Base + 4 DAC 2 Low Byte Disable Interrupts
Base + 5 DAC 2 High Byte Enable Timer Initiated DAC Update
Base + 6 DAC 3 Low Byte Disable Timer Initiated DAC Update
Base + 7 DAC 3 High Byte
Base + 8 DAC 4 Low Byte Update all outputs and place card in Simultaneous Mode.
Base + 9 DAC 4 High Byte
Base + A DAC 5 Low Byte Update all outputs and release card from Simultaneous Mode.
Base + B DAC 5 High Byte
Base + E Restrict-Output-Voltage (Disables voltage reference)
Base + F Clear Restrict-Output-Voltage (Allows full operating output voltage).
Base + 20 Digital I/O Port A, Output Digital I/O Port A, Input
Base + 21 Digital I/O Port B, Output Digital I/O Port B, Input
Base + 23 Digital I/O Control Byte
Table 5-1: Register Map
Restrict-Output-Voltage limits the output of all DAC channels and is active at power-up.
BIT D7 D6 D5 D4 D3 D2 D1 D0
Low Byte B7 B6 B5 B4 B3 B2 B1 B0
High Byte *B15 *B14 *B13 *B12 B11 B10 B9 B8
Table 5-2: DAC Data Format
* B15->B12 are ignored by 12-bit models
For Unipolar ranges, data is in true binary form.
0000 0000 0000 0000 = Zero (Low Scale)
1000 0000 0000 0000 = ½ Scale
1111 1111 1111 1111 = Full Scale
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MSB or B15
 
B0 or LSB
For Bipolar ranges, data are in offset binary form. (Same as above)