Measurement Computing DaqBoard-ISA - Manual (Page 22)

3-4 Hardware 02-14-02 DaqBoard-ISA User’s Manual
External Analog Expansion Power (JP1)
The JP1 4×2 header has 3 possible settings.
If analog option cards (DBKs) are used, the
JP1 pins are set to provide ±15 VDC to the
cards. If such cards are not used, the
counter/timer CTR0 is available, and JP1
must be set accordingly. The default
setting is for use of analog option cards.
&$87,21
If using a DBK32A Auxiliary Power Supply or a DBK33 Triple-Output Power
Supply Card, the JP1 shunt jumpers must be entirely removed. Placing the
jumpers on -OCTOUT and -OCLKIN will damage the 8254 timer chip.
Reference Note:
Refer to the Power Management section of the DBK Option Cards and Modules User’s
Manual (p/n 457-0905), as needed.
DAC Reference Selection (JP2)
The JP2 5×2 header allows you to select internal or external voltage references for the two separate analog
outputs. If the internal -5 VDC reference is selected, either DAC can output from 0 to +5 VDC as the
register count varies from 0 to 4095 (12-bit). If an external voltage reference is desired (up to 10 VDC in
either polarity), the shunt jumpers must be set accordingly. There is also a provision to allow the outputting
of a simultaneous Sample-Hold command signal on the DAC1-REFIN pin with the DAC1 set up for an
internal reference.
&$87,21
The SSH setting cannot be used at the same time as a DAC1 external reference due
to a potentially damaging conflict on P1 pin #26. The defaults are both DAC0 and
DAC1 set to Internal Reference.
Reference Note:
The SSH setting is used with DBKs: 2, 4, 5, 7, 17, 50, and 51. In regard to specific DBK
information, refer to the DBK Option Cards and Modules User’s Manual (p/n 457-0905),
as needed.
JP 2 JP 2 JP 2 JP 2 JP 2
Fa cto ry D e fa u lt
D A C 0 E xte rn al R e f
D A C 1 E xte rn al R e f
D A C 0 E xte rn al R e f
D A C 1 In te rn al R e f
D A C 0 In te rn al R e f
D A C 1 E xte rn al R e f
D A C 0 In te rn al R e f
D A C 1 In te rn al R e f
D A C 0 E xte rn al R e f
D A C 1 In te rn al R e f
w ith S S H
D A C 0 In te rn al R e f
D A C 1 In te rn al R e f
w ith S S H
E X T
IN T
S S H
IN T
E X T
D A C 1
D A C0
JP 2
JP2 DAC Reference Settings
JP 1
-1 5 V
-O C TO U T
-O C L K IN
+1 5 V
A n a lo g O ptio n
C ard U se
JP 1
-1 5V
-O C TO U T
-O C L K IN
+1 5 V
C o un te r/Tim e r U se
(1 6-bit m o d e on ly)
JP 1
-1 5 V
-O C TO U T
-O C L K IN
+1 5 V
D B K 3 2A o r D B K 3 3
O p tio n C a rd U se
JP1 External Analog Expansion Settings
Factory
Default