A switch, such as a Request to Exit button, can be connected across the DI and 0V signal INPUT connections.

The INPUT connection is on the 2‑way 3.5mm pitch connector highlighted in the diagram.

The circuit can detect a change of state between input voltage of <1V (input low) and input voltage of >4V (input high). And this input change can trigger a custom script, to perform tasks such as a beep, an LED sequence, or trigger an output.

In Local mode, this input can be monitored by custom software or a script, which will trigger defined operations or perform tasks such as running an LED sequence, buzzer or relay output.

Two OUTPUT relays can be used to switch loads up to 5A @ 50V AC. Normally open (NO), Common (COM) and normally closed (NC) contacts are available, and the outputs can be set to: ON, OFF, timed ON/OFF, or delay ON/OFF. These options support a wide range of scenarios.

Both output connectors provide +12V and up to 1A to power the equipment connected. If the connected equipment requires a higher current, the power must be supplied by using a different wiring scheme.

OUTPUT1 and OUTPUT2 connection is via the two 5‑way 3.5mm pitch connectors highlighted in the diagram.

VTAP PRO readers can drive external serial LEDs using the VTAP100‑PRO‑EXP1 expansion board. The serial LEDs can be configured to show a default colour or sequence. Alternatively, they could change colour, flash or run an animation in response to events. Those events could be a successful pass or card/tag read, VTAP reader start-up or certain error conditions.

The serial LEDs connection is on the 3‑way 3.5mm connector highlighted in the diagram.

If you are using VTAP PRO readers in Cloud mode, please contact vtap‑support@dotorigin.com to define an LED sequence and triggering event in VTAP Cloud.

In Local mode, the VTAP command interface can be used to drive serial LEDs from a free terminal emulator such as TeraTerm or PuTTY, or your own custom software or script. (Refer to VTAP Application Note on External LED control with VTAP50 for example LED control sequences).

External LED output can be used in VTAP reader applications which require LED feedback, such as:

• Kiosks;

• Turnstiles

• Arcade gaming machines (VTAP PRO readers with a VTAP PRO I/O expansion board replacing the coin mechanism)

Depending on the application, a serial LED matrix, a serial LED strip or combination of the two could be used.

The LEDs output can be configured to drive up to 255 serial LEDs. It uses the Neopixel protocol for driving serial LEDs.

The VTAP100-PRO-EXP1 will supply +5V and up to 1.5A to power an LED strip or matrix. The power drawn by your chosen LEDs (and the way you intend to use them) can restrict the number of serial LEDs that can be supported. The number of LEDs will be most restricted when each RGB LED is being run at full power (white) continuously. If your use only requires red, blue or green, or if a pattern on a matrix will only use a subset of LEDs, then a larger number of LEDs can be supported.

Serial LEDs are typically specified in terms of the current drawn by a single red, green or blue LED. Common LED current specifications are 5mA, 12mA and 20mA. Test results for the number of LEDs of each type that can be powered are given in the following table:

Any theoretical maximum number of LEDs, using lower power LEDs on a lighter duty cycle, would still be restricted by the 255 maximum number of LEDs that can be configured.