Connecting boom barriers

How the Gate Agent opens a boom barrier — a short dry-contact pulse on the controller's OPEN input through a network relay (Shelly, KMtronic, ESP32), a Modbus TCP IO module (Waveshare, USR, Advantech ADAM), a USB relay, or a Hikvision / Dahua camera's alarm output. Wiring notes, testing, and the safety rules: never wire into the motor, keep the safety loop, and never leave a barrier without a manual override.

Hayat Gate does not replace your barrier's controller. It only presses the OPEN button for you: the agent closes a relay for half a second, wired in parallel with the barrier's own open push-button. The barrier closes by itself as it does today (timer, loop detector or photocell).

Safety rules

• Never wire the relay into the motor or mains circuit. Use only the controller's low-voltage OPEN (sometimes PB-open, OPEN/COM, Push button open) input, with a dry contact: relay NO to OPEN, relay COM to the controller's COM / GND.
• Keep the barrier's own safety — the loop detector under the road and the photocell — connected. Hayat only opens; it never decides when it is safe to close.
• Never leave a barrier with no manual override. The guard must always be able to open it without Hayat: keep the controller's push-button or remote in the cabin, a key switch outside, and the manual release (hand crank or key) for power cuts. Show every guard where they are.
• Put the PC, the switch and the relay board on a UPS. Fail-safe matters more than speed: if the relay board dies, the barrier must stay usable by hand.
• Test with the barrier disconnected first (see below).

Choosing a driver

On the lane in gate.hayaterp.com, Barrier → + Add, and pick the Driver:

Pulse (ms): how long the contact is closed. 500 suits most controllers; some need 1000. Username / Password: for relays and cameras that ask for a login (kept encrypted).

The agent never pulses the same lane twice within 5 seconds, so a car read twice does not jam the barrier. A guard's Open barrier from the screen always goes through.

Wiring examples

Modbus relay (Waveshare 8-channel)

In Hayat: driver Modbus TCP, address 192.168.1.70:502, channel 0, pulse 500. CH2 for the exit lane: channel 1.

Shelly 1 — set it to momentary / auto-off in the Shelly app; wire its output contacts (O and I on the Shelly 1, dry contact) to OPEN and COM. Give the Shelly a fixed IP on the camera network. Power the Shelly from a proper supply, not from the barrier's motor terminals.

Camera alarm output — Hikvision ANPR cameras: ALARM OUT 1 (the two terminals marked ALARM OUT or 1A / 1B) to OPEN and COM. Many outputs can switch only small currents; that is fine for an OPEN input, never for a motor.

Test before you go live

Nothing happens: check the relay's IP from the gate PC (ping 192.168.1.70), the channel number (does the manual count from 0 or 1?), and the username and password. For USB relays, check the COM port number in Windows Device Manager.

Who opens the barrier and when