Omega-vehicle-security DAQ-16 Instrukcja Użytkownika Pobierz pdf (Strona 10)

2. Circuit Board Description and Configuration

The base address of the DAQ-16 is selected using switches SW1 and SW2. The operating

mode of the DAQ-16 is controlled by jumpers J1 through J7, while DMA and interrupt

selections are set with jumpers J8 through J11. Connections to external equipment are made

through the high density 62-pin connector CN1.

2.1 Analog to Digital Converter

The analog to digital (A/D) section of the DAQ-16 accepts up to 8 differential inputs from the

D-62 connector. These inputs pass through a dual 8-to-1 multiplexer circuit which selects the

channel to be converted. The selected input is then amplified and presented to the A/D

converter to be digitized. The digital output of the A/D is latched into a buffer to be read by

the computer. The multiplexer circuit selects one of the 8 differential channels to be input to

the A/D converter. The channel is software selected through the DAQ-16's control word

input resistance: 1.5 Kohm

switching time: 0.5 us

settling time: 3.5 us

The amplifier stage of the A/D converter circuit performs two functions: (1) amplifies low

level input signals and (2) converts this input signal into a voltage range acceptable to the

A/D converter. The amplifier circuit is controlled by jumpers J6 and J7. Table 2-1 below

shows the recommended jumper settings for various input voltage ranges, (* indicates factory

settings).

2-3, 4-5

2.5 v

1-3

100

+0.025/±0.025

1-2, 4-5

5 v

1-3

100

+0.05/±0.05

2-3, 5-6

10 v

1-3

100

+0.1/±.1

2-3, 4-5

2.5v

2-4

+0.25/±0.25

1-2, 4-5

5 v

2-4

+0.5/±0.5

2-3, 5-6

10 v

2-4

+1/±1

2-3, 4-5

2.5 v

3-4

+2.5/±2.5

1-2, 4-5

5 v

3-4

+5/±5

2-3, 5-6*

10 v

3-4*

+10/±10

---

Unipolar / Bipolar

A/D Range

Amplifier

Maximum Input Voltage

Table 2-1. A/D Converter Configurations

DAQ-16 Users Manual 10

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 29 30

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