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Operation Theorem
4.2 D/A
Conversion
USBDAQ-9100MS has 2 single-ended analog output channels. The
connection of D/A channels are controlled by 2 relays. That is, output
channels are open circuits before you initialize your program. 2 output
channels are separated from connectors. Also, before initialize your
program, you will measure a floating voltage on RCA connectors.
The D/A output of USBDAQ-9100MS supports two modes. One-shot
Output mode and the other is Continuous Output mode. With One-hot
data acquisition mode, PC sends one output data to D/A converter. And
with Continuous Mode, the output data are stored in the D/A output FIFO
memory and data update frequency is defined by the parameter,
UpdateRate in software driver. Data can be output in a constant, accurate
frequency continuously by this mode.
There is an 1-K FIFO data buffer for each channel (actually size is 1023
samples) . With retransmit function which allows to cyclic restart from the
beginning once the end of data buffer is reached.
4.3 Digital Input and Output
There are 8 isolated digital input channels and 8 isolated digital output
channels. To program digital I/O operation is very straightforward. The
digital input/output operation is just to read/write data by calling the
corresponding software API.
Summary of Contents for USBDAQ-9100MS
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