Measurement Computing CIO-DDA06 - Manual (Page 11)

CIO-DDA06 User's Guide Installing the CIO-DDA06
Individual updates
per DAC
(two channels)
XFER
UPDATE # #
Simultaneous updates
from all DACS
jumpered to XFER
XFER
UPDATE # #
Figure 3. Individual / simultaneous update jumper
ƒ When the jumpers are in the XFER position, new output data is held until one or more DACs have been
loaded with new digital data. The new data transfers to the voltage outputs as a group. The simultaneous
transfers occur when any of the CIO-DDA06 addresses are read (and the jumpers are in the
XFER
position).
ƒ When the jumpers are in the UPDATE ## position, the DAC channel pair is individually updated when the
control register is written.
Power up and reset jumper
The power up and reset jumper (hardware revision 3 and later) controls the state of the DAC outputs when the
CIO-DDA06 board is powered up or reset. This jumper is shown in Fi
. gure 4
Figure 4. Power up and reset jumper
zero volts
power up
Undefined
power up
ZERO
STD
ZERO
STD
ƒ When set for ZERO , all DACs are cleared to 0 volts, ±32 mV on power up and reset. In addition, all DACs
are set to simultaneous update mode until first read.
ƒ When set for STD , the analog output values are undefined on power up and reset.
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