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2-2
Functional Description
Digital I/O Features
The 24 bits of digital I/O delivered to the main I/O connector are
configured as three 8-bit ports. Each of these ports can be independently
programmed as an input or an output and is TTL/CMOS compatible.
The DDA-06 uses an 8255 P.P.I. (programmable peripheral interface)
chip for digital I/O; this chip can operate in any of the 8255 modes
(modes 0 to 2), which are straight I/O, strobed I/O, and bidirectional I/O.
Analog Output Features
The DDA-06 board contains six, independent, 12-bit DACs
(digital-to-analog converters) that are individually switch-selectable for
any of the following ranges:
●
0 to 10 V
●
0 to 5 V
●
±2.5 V
●
±5 V
●
±10 V
●
4 to 20 mA current loop (sink)
Each DAC has a double-buffered input for single-step update, and each
occupies its own I/O location.
You can set a jumper block at each DAC for individual or simultaneous
update.
Each DAC output has its own pin on the main I/O connector. You can
jumper the output of each DAC to deliver either voltage (V) or current (I)
to this pin. In voltage mode, output settling time is typically 3 µs to 0.01%
for a full-scale step.
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