Measurement-computing SWITCH AND SENSE 8/8 Manual do Utilizador descarregar pdf (Página 12)

3-1

Chapter 3

Functional Details

The Switch & Sense 8/8 expands the capabilities of desktop personal computers by providing SPDT relay

control and isolated inputs in a plug-and-play package. Screw terminals provide easy field wiring to the three

output lines for each of the eight on-board relays (see Figure 3-2

on page 3-2).

In addition, two terminals are provided for the differential input signals associated with each of the eight

isolated inputs.

External components

The Switch & Sense 8/8 has the following external components, as shown in Figure 3-1.

! Direct current (dc) power connector

! External power LED

! Status LED

! USB connector /cable

STATUS

LED

EXTERNAL POWER

LED

USB connector/cable

Direct Current

power connection

(7.5 to 20 V)

Figure 3-1. Switch & Sense 8/8 external components (rear view)

Direct current (dc) power connector and +9 V power supply

The Switch & Sense 8/8 requires between +7.5 V and +20 V of external power. Your computer can configure

the Switch & Sense 8/8 without external power. However, external power connection is required to activate the

relays and to run tests in InstaCal.

The USB specification allows high power devices to draw up to 500 mA. When all eight relays are energized,

the collective current draw exceeds the maximum allowed for high power USB devices. Therefore, external

power is required.

Use the +9-volt (V) DC power supply cord shipped with the Switch & Sense 8/8 to provide external power to

this connector.

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Measurement-computing SWITCH AND SENSE 8/8 Manual do Utilizador Página 12