Bus Wireless Receiver (Stop-Request + Accessibility Buttons, up to 16 paired)

Overview — why a wireless receiver

City buses, coaches and BRT vehicles need a "next-stop request" signalling path from any passenger seat to the driver. The traditional wired approach runs a hard-wired button cable from every passenger seat back to a centralised input pin on the cluster — doable on a small vehicle but quickly becomes a harness-routing nightmare on a 12-metre coach with 50+ seats spread across two decks. The wireless approach pairs an in-cabin transmitter button at every signalling location with a single receiver near the driver — one cable from the receiver to the cluster, no wiring back to every seat.

The EBX-2404 implements this pattern with a dedicated twist for the modern accessibility-mandated bus programme: two separate output channels on the connector face. The general stop-request channel (pin 4) carries the standard passenger-press signal — the cluster / annunciator system shows the "next-stop" indicator and sounds the chime. The dedicated disability-accessibility channel (pin 3) carries the wheelchair-ramp / accessibility-stop signal — a separate button placed in the accessibility seat / priority-seat area, which the vehicle programme can act on differently from a routine stop — for example a longer dwell at the next stop, an extended wheelchair-ramp deploy time, or an accessibility-priority annunciation from the driver-side speaker. The two channels are independent low-active outputs — the upstream cluster subscribes to each channel separately and dispatches the corresponding behaviour.

Functional sequence

1. Pairing a new transmitter button

To pair a new wireless transmitter button with the receiver:

1. Press the on-board learn button on the receiver once — the run-state LED turns steady-on, indicating that the receiver is now in pairing mode
2. Press the new transmitter button once — the receiver captures the new button's wireless ID and adds it to the paired-button list (up to 16 buttons total)
3. On successful pairing, the receiver's LED flashes 250 ms on / 250 ms off as the pair-confirmation indication, then returns to steady-off (waiting for the next pairing event)
4. Repeat steps 2–3 for each additional transmitter button (up to 16 total)

2. Exiting pairing mode

The receiver exits pairing mode under two conditions:

• Time-out: No transmitter button is paired within 30 s of entering pairing mode — auto-exit
• Manual: Press the on-board learn button again while in pairing mode — immediate exit (useful when the operator has finished a partial pairing run and wants to leave the rest of the buttons for a later session)

3. Clearing all paired buttons

Long-press the on-board learn button for > 3 seconds — the receiver clears all 16 paired-button records and returns to the un-paired baseline. Useful for fleet redeployment / handover or when the fleet operator wants to re-provision a vehicle with a new set of transmitter buttons.

4. Press handling — general stop-request channel (pin 4)

When the receiver demodulates a press signal from any of the paired general transmitter buttons, it asserts pin 4 (general stop-request output) low for the configured pulse width. The upstream cluster / annunciator subscribes to pin 4 and dispatches the "next-stop" indication + chime. After the first signal, the receiver ignores all incoming signals for 1 second — this is the debounce window that prevents a rapid double-press, a near-simultaneous press from two passengers or a momentary RF reflection from chaining multiple stop-requests through the cluster. After 1 s, the receiver returns to normal listening.

5. Press handling — disability-accessibility channel (pin 3)

The dedicated disability-accessibility channel works the same way as the general channel but on pin 3 and on a different paired-button subset (per the fleet's accessibility-button provisioning). When the receiver demodulates a press signal from a paired accessibility transmitter button, it asserts pin 3 (disability-accessibility output) low. The upstream cluster dispatches the "accessibility next-stop" behaviour — longer dwell at the next stop, extended wheelchair-ramp deploy time, accessibility-priority annunciation. The same 1-second debounce applies after the first accessibility signal.

Engineering details

• Two separate output channels — the dedicated disability-accessibility channel separates the standard stop-request from the wheelchair-ramp signal, letting the cluster / annunciator differentiate the two press types and dispatch the appropriate dwell + ramp behaviour
• Up to 16 paired transmitter buttons on a single receiver — sized for a typical 12-metre city bus or a touring coach with multiple stop-request locations spread across the cabin
• Wide 9-36 VDC supply — the same receiver SKU is usable on 12 V (smaller minibus / shuttle) and 24 V (city bus / coach) platforms without a separate part number
• ESD level 4 / class A — cabin-side mounting near passenger contact surfaces; ESD immunity at the level needed for the typical passenger-touch ESD environment
• 1-second debounce after first signal — prevents repeated near-simultaneous presses from chaining unwanted multiple stop-requests; returns to normal listening after the window
• On-board learn button + 2-LED status — pairing without any external tool, with clear pair-state and run-state visual indication
• IP5K2 baseline / IP65 with optional sealing gasket — cabin-side baseline is the IP5K2 dust-protected splash-protected class; for under-dash / wet-zone placement near windscreen-wash spillage, specify the optional sealing-gasket variant at quotation
• TE Deutsch DT04-4P / DT06-4S connector pair — industry-standard automotive 4-pin sealed connector with wide global availability for the matching wire-side housing, terminals and seals
• Compact 106 × 89 × 25 mm body — takes a small footprint on the driver-side bracket above the dashboard

Mechanical layout

4-pin pin-out reference

Comparison with related EBX-family wireless receivers

The EBX-2404 is the right choice for a bus / coach programme that wants the passenger-stop-request feature delivered as a wireless cabin-side receiver paired with multiple transmitter buttons, with the accessibility press signal carried on a separate output channel for cluster-side differentiation. For tyre-pressure monitoring with a wireless receiver, look at EBX-957 TPMS receiver; for the wireless passive-entry / push-start function, look at EBX-964 PEPS core controller.

Manufacturing & testing

Built under IATF 16949 with APQP project planning and a PPAP package available for OEM programmes. Every unit is end-of-line functional-tested before packaging — the pair-mode entry / exit / time-out cycle with the LED status profile, paired-button press detection on both pin 3 and pin 4 channels, the 1-second post-press debounce window and the long-press > 3 s clear-all behaviour. ESD class A immunity and the IP5K2 sealing baseline are qualified by type and sample testing rather than on every unit. The optional sealing-gasket variant adds a leak-test step before packaging.

How to ask

The EBX-2404 belongs to the Smart Control Modules family. To request the harness drawing, the wireless-button transmitter SKU, the fleet-provisioning pairing toolchain, the sealing-gasket variant for IP65 placement or a PPAP package, please use the contact page with your target vehicle programme, expected annual volume and key technical requirements (bus / coach platform voltage, transmitter-button count, accessibility-button location, mounting position, IP rating). Drawings welcome. For how the whole stop-request signal chain fits together — wired versus wireless and how a press reaches the driver — see the bus stop request button buyer guide.