Measurement-computing USB-PDISO8/40 Uživatelský manuál stáhnout pdf (Strana 14)

USB-PDISO8/40 User's Guide Functional Details

External power connectors

The USB-PDISO8/40 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-PDISO8/40. 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-PDISO8/40 is connected to a computer or external USB hub.

Blinks continuously

Initial communication is established between the USB-PDISO8/40 and the computer, or data is

being transferred.

PWR LED

The USB-PDISO8/40 incorporates an on-board voltage supervisory circuit that monitors 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 +9 V external power is supplied to the USB-PDISO8/40.

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:

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

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

The USB-PDISO8/40 requires between 6.5 V and 12.5 V of external power. An 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 USB-PDISO8/40 to provide external power to this

connector.

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