2-1
2
Functional Description
This chapter describes the features of the digital I/O and analog output
sections of the DDA-06 board. These descriptions are provided to
familiarize you with the operating options and to enable you to make the
best use of your board. Figure 2-1 shows a block diagram of the DDA-06
board.
Figure 2-1. Block Diagram of DDA-06
DAC
0
Out 0
Latch
12
DAC
5
Out 5
12
DAC
4
Out 4
Latch
12
DAC
3
Out 3
Latch
12
DAC
1
Out 1
Latch
12
DAC
2
Out 2
Latch
12
Digital I/O (8255 P.P.I.
PC
PA
PB
24 Digital I/O Lines
Data
Buffers
Address
Decode
Latch
V
I
V
I
V
I
V
I
V
I
V
I
V = 0 to 10 V, 0 to 5 V,
±2.5 V, ±5 V, ±10 V
I = 4 to 20 mA current
loop (sink)
Base Address
Select
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