Manual PCI-DA12-2/4/6
11
Chapter 3: Option Selection
Voltage output ranges are determined by switch settings as described in the following paragraphs. Also,
the method to update D/A outputs is programmable as described here and in Chapter 5, Programming .
Output Ranges
There is a three-position slide switch associated with each DAC channel to make voltage range selection:
switches S1 (Channel 0) through S6 (Channel 5). A silk-screen diagram on the card defines switch
positions to use for each range. In addition to the switch, one jumper per channel is used to select
Voltage vs Current Output. The following table presents the same information:
Voltage Range
Sn-1
Sn-2
Sn-3
OUT 0-5
0 to +2.5V
OFF OFF ON
Set in Position V
0 to +5V
OFF OFF OFF
0 to +10V
OFF ON
OFF
-2.5V to +2.5V
ON
OFF ON
-5V to +5V
ON
OFF OFF
-10V to +10V
ON
ON
OFF
Current Range
S1
S2
S3
OUT 0-5
4 mA to 20 mA
OFF OFF OFF Position I
Analog Output Update
Analog outputs are updated under program control in either one of two ways:
a.
Automatic Update: Each channel is updated individually when new data are written to the
related high-byte base address. Individual update mode may be set by a special read operation as
defined in the programming section of this manual.
OR
b.
Simultaneous Update: The outputs of all D/As may be updated simultaneously. This is
done by first enabling simultaneous updating for all outputs and then preloading the low and high bytes of
each DAC and then initiating a simultaneous update by software command.
Refer to Chapter 5, Programming of this manual for more detail.
