Measurement-computing USB-2408 Series Manuel d'utilisateur télécharger pdf (Page 10)

Chapter 3

Functional Details

External components

USB-2408 Series devices have the following external components:

 USB connector

 LEDs

 Screw terminals

Figure 2 shows the location of each component.

Screw terminal pins 23 to 44

USB Connector

Status LED

Screw terminal pins 1 to 22

Activity LED

Figure 2. USB-2408 Series components

USB connector

The USB connector provides 5 V power and communication. No external power supply is required.

LEDs

USB-2408 Series devices have two LEDs – STATUS and ACTIVITY.

 The Status LED is lit when the device is detected and installed on the computer.

 The Activity LED indicates the communication status of a device. This LED blinks when data is

transferred, and is off when the device is not communicating.

Screw terminals

USB-2408 Series devices have two banks of screw terminals. Screw terminal functions for DIFF and SE modes

are identified in Figure 4 and Figure 3.

The USB-2408 Series device screw terminals provide the following connections:

 16 SE (CH0 to CH15 – see Figure 3) or eight DIFF (CH0H/CH0L to CH7H/CH7L) analog input connections

 Eight digital I/O connections (DI00 to DI07)

 Two analog output connections (AOUT0, AOUT1) – USB-2408-2AO only

 Two counter inputs (CTR0, CTR1)

 One power output (+5V)

 10 analog grounds (AGND), four digital grounds (DGND), and one chassis ground (CHAS)

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Measurement-computing USB-2408 Series Manuel d'utilisateur Page 10