PCI-1202/1602/180x Series Card
Multi-Function Boards
User Manual/ Ver. 4.8/ Mar. 2015/ PMH-0014-48/ Page: 83
6.7
BAR4: A/D and D/A Register
The I/O address of A/D and D/A register is given as follows:
I/O address of DA-0
wAddrAdda
I/O address of DA-1
wA1*4
I/O address of FIFO
wAddrAdda
This BAR4 address is used to write data to the DACs and to read data from the A/D FIFO. The
read/write operation is given as follows:
Port
Read
Write
BAR4 + 0
A/D FIFO.
DAC1 write.
BAR4 + 4
Reserved
DAC2 write.
The PEX-1202 and PCI-1202/1602/1800/1802 series card provides 2 independent 12-bits D/A
converters with double buffer, bipolar voltage output. The output voltage can be
±
5 V or
±
10 V
selected by J1. When the PEX-1202/PCI-1202/1602/1800/1802 series card is first power-on, the D/A
will be in the floating state. The D/A will go to the programmed state after executing D/A output
command. The block diagram is given as below:
Figure 6.7-1: D/A output diagram.
Se 0
DA1
DA2
Local Data Bus
D0,D1…D11
Se 4
Double Buffer
Analog Output 1
Analog Output2
Vref
5 or
10 V