Measurement-computing USB-1608GX-2AO-OEM Manual de usuario descargar pdf (Pagina 14)

USB-1608GX-2AO-OEM User's Guide Functional Details

External clock I/O

The USB-1608GX-2AO-OEM provides one external clock input (AICKI) and one external clock output

(

AICKO) for analog inputs, and one external clock input (AOCKI) and one external clock output (AOCKO) for

analog outputs.

 You can connect an external clock signal to

AICKI and/or AOCKI.

When using an external clock,

AICKO outputs the pulse generated from AICKI, and AOCKO outputs the

pulse generated from

AOCKI.

 When using the internal clock,

AICKO outputs the ADC scan clock, and AOCKO outputs the DAC scan

clock.

Digital I/O

You can connect up to eight digital I/O lines to DIO0 through DIO7. Each digital channel is individually

configurable for input or output. The digital I/O terminals can detect the state of any TTL-level input. Refer to

the schematic shown in Figure 5.

Figure 5. Schematic showing switch detection by digital channel DIO0

If you set the switch to the +5 V input, DIO0 reads TRUE (1). If you move the switch to GND, DIO0 reads

FALSE (0).

Pull-up/down configuration

Unconnected inputs are pulled low by default to 0 V through 47 kΩ resistors via jumper

W1 on the circuit board

(see Figure 6).

Figure 6. W1 jumper location

The pull-up/pull-down voltage is common to all 47 kΩ resistors. Jumper W1 is configured by default for pull-

down. Figure 7 shows the jumper configured for pull-up and pull-down.

Caution! The discharge of static electricity can damage some electronic components. Before touching the

board, ground yourself using a wrist strap or touch the computer chassis or other grounded object

to eliminate any stored static charge.

Figure 7. W1 jumper configurations

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 25 26

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Measurement-computing USB-1608GX-2AO-OEM Manual de usuario Pagina 14