Measurement-computing USB-ERB08 Bedienungsanleitung PDF herunterladen (Seite 15)

USB-ERB08 User's Guide Functional Details

External power connectors

The USB-ERB08 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.

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

operate the USB-ERB08. 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-ERB08

devices" on page 3-4 for more information.

USB LED

The USB LED indicates the communication status of the USB-ERB08. It uses up to 5 mA of current and cannot

be disabled. explains the USB LED function. Table 3-2

Table 3-2. USB LED Illumination

USB LED

illumination

Indication

Steady green The USB-ERB08 is connected to a computer or external USB hub.

Pulsing green

Initial communication is established between the USB-ERB08 and the computer, or data is being

transferred.

PWR LED

The USB-ERB08 incorporates an on-board voltage supervisory circuit that monitors the external 9 V power. If

the input voltage falls outside of the specified range, the PWR LED shuts off. explains the function of

the PWR LED.

Table 3-3

Table 3-3. PWR LED Illumination

PWR LED

illumination

Indication

Steady green External power is supplied to the USB-ERB08.

Off

Power is not supplied by the external supply, or a power fault has occurred. A power fault occurs

when the input power falls outside of the specified voltage range of the external supply (6.0 V to

12.5 V).

Invert/Non-invert switch (S1)

The Invert/non-invert switch (S1) sets the relay control logic per relay bank to either inverted or non-inverted.

By default, switch S1 is configured for non-invert (see ). Figure 2-3

NON-INVERTINVERT

Figure 3-2. Switch S1 default configuration

The switch labeled CL configures relays 1 through 4, the switch labeled CH configures relays 5 through 8.



NON-INVERT: when "0" is written or read back via the USB bus, the relays are not energized.

 INVERT: when "0" is written or read back via the USB bus, the relays are energized.

Switch settings do not affect the power-on condition. Use InstaCal to read the current logic setting for each

module group.

3-2

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