Measurement-computing USB-ERB24 Manuel d'utilisateur télécharger pdf (Page 13)

USB-ERB24 User's Guide Installing the USB-ERB24

Relay control logic polarity

Configure the

Invert/non-invert switch (S1) to set the relay control logic polarity for each relay bank for invert

or non-invert. By default, this switch is shipped with all banks configured for non-inverted logic, as shown in

. Figure 2-4

Figure 2-4. Relay logic switch S1

NON-INVERTINVERT

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

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

Switch settings for polarity can be read back via software through the USB bus. Switch settings for S1 do not

affect the power-on condition.

Relay power-on state

Configure the

Pull-up/pull-down switch (S2) to set the state of each relay bank at power-up. By default, this

product is shipped with the switch for all banks configured for pull-down (relays inactive at power up), as

shown in Fi . Switch settings can be read back via software through the USB bus. gure 2-5

Figure 2-5. Resistor pull-up/down switch S2

PULL UPPULL DOWN

 PULL-UP: the relays are put into an energized state at power-up, regardless of the state of switch S1

 PULL-DOWN: the relays are put into a non-energized state at power-up.

Connecting the external power supply

Power to the USB-ERB24 is provided with the 9 V, 3 A external power supply (CB-PWR-9V3A). You must

connect the external power supply before connecting the USB connector to the USB-ERB24.

To connect the power supply to your USB-ERB24, do the following:

Connect the external power cord to the power connector labeled

POWER IN on the USB-ERB24 enclosure

(PWR IN on the board). Refer to Fi for the location of this connector. gure 3-1

Plug the AC adapter into a power outlet.

The

PWR LED illuminates green when 9 V power is supplied to the USB-ERB24. If the voltage supply is less

than 6.0 V or more than 12.5 V, the PWR LED does not light.

Do not connect external power to the POWER OUT connector

The power connector labeled POWER OUT on the enclosure (PWR OUT on the board) is used to provide power

to an additional MCC USB Series product. If you connect the external power supply to the POWER OUT

connector, the USB-ERB24 does not receive power, and the PWR LED will not illuminate.

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Measurement-computing USB-ERB24 Manuel d'utilisateur Page 13