Measurement-computing USB-ERB24 Manual de usuario descargar pdf (Pagina 15)

Chapter 3

Functional Details

Internal components

The USB-ERB24 has the following internal components, as shown in Figure 3-1.

 Two (2) USB connectors

 Two (2) external power connectors

 USB LED

 PWR LED

 Invert/non-invert switch (S1) — sets the relay control logic polarity

 Pull-up/down switch (S2) — sets the relay power-on state

 Screw terminals

Invert/non-invert

switch (S1)

PWR LED

USB LED

USB I

POWER

OUT

POWER I

USB

OUT

Pull-up/pull-down

switch (S2)

Screw terminals

Figure 3-1. USB-ERB24 components

USB in connector

The USB out connector is labeled USB IN on the board and enclosure.

The USB IN connector is a USB 2.0 full-speed input connector that you connect to the USB port on your

computer (or USB hub connected to your computer). This connector supports USB 1.1, USB 2.0 devices.

USB out connector

The USB out connector is labeled USB OUT on the board and enclosure.

The

USB OUT connector is a downstream hub output port intended for use with other MCC USB Series

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

For information on daisy chaining to other MCC USB Series products, refer to Daisy chaining additional

modules to the USB-ERB08 on page 3-3.

External power connectors

The USB-ERB24 has two external power connectors labeled POWER IN and POWER OUT on the enclosure.

The

POWER IN connector is labeled PWR IN and P19 on the board, and the POWER OUT connector is labeled

PWR OUT and P20 on the board.

Connect the

POWER IN connector to the supplied +9 V external power supply. External power is required to

operate the USB-ERB24. The

POWER OUT connector lets you power additional daisy chained MCC USB

Series products from a single external power supply. Depending on your load requirements, daisy chained

products may require a separate power supply. Refer to "Power limitations using multiple USB-ERB24

devices" on page 3-4 for more information.

3-1

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