Measurement-computing USB-1024LS User Manual download pdf (Page 11)

Chapter 3

Functional Details

External components

The USB-1024LS has the following external components, as shown in Figure 3-1.

! USB connector

! LED

! Screw terminal banks (2)

USB

connector / cable

Screw terminal

Pins 21 to 40

Screw terminal

Pins 1 to 20

LED

Figure 3-1. USB-1024LS external components

USB connector

The USB connector is on the right side of the USB-1024LS housing. This connector provides +5 V power and

communication. The voltage supplied through the USB connector is system-dependent, and may be less than +5

V. No external power supply is required.

LED

The LED on the front of the housing indicates the communication status of the USB-1024LS. It uses up to 5

mA of current and cannot be disabled. defines the function of the USB-1024LS LED. Table 3-1

Table 3-1. LED Illumination

LED Illumination Indication

Steady green The USB-1024LS is connected to a computer or external USB hub.

Blinks continuously Data is being transferred.

Blinks three times Initial communication is established between the USB-1024LS and the computer.

Screw terminal wiring

The USB-1024LS has two rows of screw terminals – one row on the top edge of the housing, and one row on

the bottom edge. Each screw terminal bank provides 20 connections. Pin numbers are identified in . Figure 3-2

3-1

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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Measurement-computing USB-1024LS User Manual Page 11