CyberResearch® Digital I/O

UCERB 24

Each DIP switch sets the configuration of one relay group. The DIP switch labeled A configures relays 1 to 8, the switch labeled B configures relays 9 to 16, the switch labeled CL configures relays 17 to 20, and the switch labeled CH configures relays 21 to 24 (Figure 2-2).

A

Configures relays 9-16 B

Configures relays17-20 CL

Configures relays21-24 CH

Figure 2-2. Typical board switch

Port A consists of relays 1 through 8, Port B consists of relays 9 through 16, Port CL consists of relays 17 through 20, and Port CH consists of relays 21 through 24.

Remove from the enclosure to access the on-board switches

To change the configuration of a switch, you must first remove the UCERB 24 from the enclosure.

Relay control logic polarity

Configure the Invert/non-invertswitch (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 2-3.

INVERT NON-INVERT

A

B

CL

S1 CH

Figure 2-3. Relay logic switch S1

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

ƒINVERT 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-downswitch (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 Figure 2-4.Switch settings can be read back via software through the USB bus.

PULL DOWN PULL UP

A

B

CL

S2 CH

Figure 2-4. Resistor pull-up/down switch S2

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

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

Connecting the external power supply

Power to the UCERB 24 is provided with the 9 V, 3 A external power supply. You must connect the the external power supply before connecting the USB connector to the UCERB 24.

To connect the power supply to your UCERB 24, do the following:

1.Connect the external power cord to the power connector labeled POWER IN on the UCERB 24 enclosure (PWR IN on the board). Refer to Figure 3-1for the location of this connector.

2.Plug the AC adapter into a power outlet.

CyberResearch, Inc.

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