Measurement-computing USB-PDISO8 Manuel d'utilisateur télécharger pdf (Page 12)

USB-PDISO8 User's Guide Functional Details

USB OUT connector

The USB OUT connector is a downstream hub output port intended for use with other Measurement Computing

USB products only. The USB hub is self-powered, and can provide 100 mA maximum current at 5 V. The USB

out connector is labeled

USB OUT on the enclosure and on the board.

For information on daisy chaining to other Measurement Computing USB products, refer to "

" on page 3-6.

Daisy chaining

additional modules to the USB-PDISO8

USB IN connector

Connect the USB IN connector to the USB port on your computer (or USB hub connected to your computer).

The USB in connector is labeled

USB IN on the enclosure and on the board.

External power connectors

The USB-PDISO8 has two external power connectors labeled POWER IN and POWER OUT on the enclosure.

The

POWER IN connector is labeled PWR IN on the board, and the POWER OUT connector is labeled PWR

OUT on the board.

To supply external power, connect the

POWER IN connector to the supplied +9 V external power supply (CB-

PWR-9).

The

POWER OUT connector lets you power additional daisy chained Measurement Computing USB products

from a single external power supply. The C-MAPWR-x cable is available from MCC to connect additional

Measurement Computing USB products.

USB LED

The USB LED indicates the communication status of the USB-PDISO8. This LED uses up to 5 mA of current

and cannot be disabled. explains the function of the USB LED. Table 3-1

Table 3-1. USB LED Illumination

USB LED

illumination

Indication

Steady green The USB-PDISO8 is connected to a computer or external USB hub.

Blinks continuously

Initial communication is established between the USB-PDISO8 and the computer, or data is

being transferred.

PWR LED

The USB-PDISO8 incorporates an on-board voltage supervisory circuit that monitors the USB VBUS (5V) and

the external 9 V power supply. If the input voltage falls outside of the specified ranges the

PWR LED shuts off

(see ). Table 3-2

Table 3-2. PWR LED Illumination

PWR LED

illumination

Indication

Steady green USB +5 V power or +9 V external power is supplied to the USB-PDISO8.

Off

Input power is not supplied, or a power fault has occurred. A power fault occurs when the input

power falls outside of the specified voltage range:

USB VBUS (+5 V): 4.75 V to 5.25 V

External power: (+9 V): 6.5 V to 12.5 V

3-2

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Measurement-computing USB-PDISO8 Manuel d'utilisateur Page 12

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