Relay2-DR (2 Isolated Outputs)

Convert BrightSign Output to Relay Contacts

Isolated output (Relay2)    

Relay2-DR-uP

Features:

• small footprint (3.2 x 3.0 inches)
• Both GPIO have to go low to enable relays (prevents pulse of relays on power up by the BrightSign)
• Connect to BrightSign GPIO to drive 3V relays with isolated contacts
• 2 Relays with Isolated Outputs (Normally Open Contacts)
• 'Snubber networks' included for EMI/RFI noise reduction.
• Use with the BrightSign 3.3V power

Outputs:

The relay is used to supply isolated outputs (switch closures) to remote devices or lamps.  U.L. Single Contact Ratings: 10 amps 120/240VAC

Operation:

Because the BrightSign powers up with 3V on the GPIO (pull up resistors pull up the inputs to 3V).  When BrightAuthor sets the GPIO pins to outputs (See: Presentation Properties),  the outputs then go low.  A microprocessor is used to solve this dilemma of not turning the relays on until the outputs go low.  The microprocessor is also programmed to hold the relays off for 2 seconds after power is applied.  This prevents a possible 'race condition' on power-up that could cause a pulse of the relay while the BrightSign boots.  Set the GPIO outputs to high ('ON' in BrightAuthor) to activate the corresponding relay.

Note: Both GPIO control pins (K1 and K2 connections) have to be low (Off) before the processor will respond the the signal going high (ON)

Note: If driving a logic circuit using the relays, it may be necessary to disconnect the snubber network to prevent the snubber network from sending a pulse to the logic board when power is applied.  I.E. with no BrightSign connections: If applying power to the contacts of the relay triggers (pulses) your logic circuitry, then open the connection between the capacitor and resistor of the snubber network (see the schematic for details).

TB1 Connections:

• Connect the BrightSign 3.3V to V+ on the board.
• Connect the GPIO's to 'K1 or K2' pins on the board
  Note: One GPIO output can drive both relays if required.
• Connect 0V of the BrightSign to 0V on the board.

Last Revised: 08/27/2024