User`s guide

Operation Theory

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4.1.2 DA data format

The DA data format is a 12-bit unsigned value for all channels, that is, the

value is in binary format. The digital value range from 0(0X000) to

+4095(0xFFF) corresponds to the full span of the output range, which is set

by the jumpers. Table 4.1 shows the relationship between the digital value

and the analog output voltage.

If the application requires a smaller voltage range, the PCI-6308 can still be

applied. For example, if the application voltage range is uni-polar between

0~5V, user need only set jumper to external reference mode, and supply a

5V source to pin 6 of CN1.

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 above 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.