Machine operators
Retrofit existing machines with QR payment, remote start, telemetry, and fault reporting without rebuilding the full cabinet.
Who this helpsQR payment controller boards for unattended machines
Add QR payment, API control, and data upload to vending, laundry, locker, and self-service machines.
QuLink supplies QR payment controller boards and API-ready control boards that connect MDB, pulse, relay, serial, RS485, and custom machine interfaces to your server. Your platform sends commands; QuLink handles the machine-side protocol, payment callback, data upload, and scan-to-start action.
Not sure which board fits?
Send the machine photo, current board photo, or coin/payment module photo. We will identify the interface and suggest a sample test path.
Machine interfacesMDB, pulse, relay, UART, RS485, serial, custom wiring
Project entrySend a machine photo, board photo, wiring note, or API requirement
Delivery pathSample test, API integration, field pilot, then OEM customization
QuLink Control Layerdevice: VM-1049
MachineMDB / Pulse / Relay / Serial
QuLink BoardTranslate + Connect
Your ServerCommands + Data + Events
POST /v1/devices/VM-1049/commands
{
"command": "trigger_relay",
"source": "api_or_qr",
"duration_ms": 800
}
No platform lock-inNo closed SaaSNo protocol rebuild
Popular machine use cases
Start from your machine type.
Choose the closest use case first. Each guide explains the machine interface, trigger workflow, data upload path, and what to send for a sample test.
Vending QR payment
Scan-to-pay vending with API vend trigger and result upload.
Open guide
Laundry QR payment
Timed relay or pulse start for washers and dryers.
Open guide
Smart locker unlock
API or QR-triggered relay unlock with door status upload.
Open guide
RS485 data upload
Telemetry, fault, meter, and serial data callbacks.
Open guide
MDB cashless retrofit
Add QR or wallet callback to existing MDB vending machines.
Open guide
Massage chair payment
QR scan-to-start timed sessions for massage chairs.
Open guide
EV charging socket
Timed power sessions, relay control, and usage data.
Open guide
Kiddie ride pulse
Coin pulse replacement for rides and amusement devices.
Open guideDevice control hardware
Keep your platform. Use QuLink for the machine-side QR payment and control layer.
Your platform controls
- Your cloud, app, and business logic
- Your payment provider, wallet, checkout, or QuLink QR payment workflow
- Your customer data and backend
- Your pricing, loyalty, and operations flow
QuLink hardware handles
- Machine control board and connectivity
- MDB, pulse, relay, serial, and QR payment trigger logic
- Device commands, data upload, webhooks, and telemetry
- OEM board customization for repeat deployment
Who this helps
Different buyers, one machine-side control layer.
QuLink is most useful when software, payment, or operations teams need a physical machine to react reliably after an API command or payment confirmation.
Payment apps / wallets
Keep the checkout and user flow in your platform; use QuLink for the machine-side trigger and result callback.
Who this helpsSystem integrators
Use API commands, webhooks, and board-level interface mapping instead of rebuilding MDB, pulse, relay, or serial behavior.
Who this helpsMachine OEMs
Move from sample validation to firmware, connector, enclosure, and board customization for repeat deployment.
Who this helpsBoard selection
Start from the machine interface, not from a product name.
Most customers do not know the exact board model at first. Send the machine type, interface, wiring photo, or target action; QuLink will map it to a control board and API workflow.
Machine interface
Choose this board
Typical machines
What it solves
MDB
MDB-to-Cloud Gateway
Vending, coffee, smart retail
Vend command, MDB event, telemetry, payment trigger
Pulse / Relay
Pulse Relay Controller
Laundry, kiddie rides, massage chairs, car wash
Timed run, relay output, pulse simulation, session result
UART / RS485 / Serial
Machine Data Bridge
Cabinets, terminals, metered devices
Status upload, sensor data, fault alert, command callback
QR scan-to-start
QR / API Trigger Board
Payment boxes, lockers, charging, vending
Payment confirmation to machine action
Custom wiring
OEM Control Board
Machine OEMs and repeat deployments
Connector, firmware, enclosure, board layout customization
Board examples
Real board styles for machine integration projects.
These board examples cover the machine-side jobs customers usually ask about: retail control, PLC vending, lift control, QR/API trigger, 4G data transmission, display/payment terminals, relay control, metering, charging, and lock control.
Retail / 4G / Data
Retail 100-channel 4G control board
Vending and smart retail main control, multi-channel I/O, 4G connectivity, telemetry, and remote commands.
- Best for
- Retail / 4G / Data
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
PLC / Vending / Relay
PLC vending multifunction board
PLC vending control, relay outputs, motor/slot control, cabinet wiring, and API-driven operation.
- Best for
- PLC / Vending / Relay
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Lift / Vend / Sensor
Lift vending control board
Lift cabinet control, elevator motor coordination, drop detection, serial/MDB integration, and vend result reporting.
- Best for
- Lift / Vend / Sensor
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
4G / Cabinet / Telemetry
4G retail controller board
Retail cabinet controller with cellular module, SIM, multi-port wiring, machine status upload, and remote control.
- Best for
- 4G / Cabinet / Telemetry
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
QR / API / Trigger
QR / API trigger board
Scan-to-start and API command board for payment callback, relay trigger, timed run, unlock, or dispense actions.
- Best for
- QR / API / Trigger
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
4G / IoT / OTA
4G IoT terminal enclosure
Compact cellular control box for remote equipment connection, data upload, OTA support, and field installation.
- Best for
- 4G / IoT / OTA
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
4G / Retrofit / Data
Compact 4G control box
Small 4G controller for machine data transmission, remote command, and retrofit integration.
- Best for
- 4G / Retrofit / Data
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Module / Data / Server
4G data module board
Cellular data module for connecting legacy machines to a server with telemetry and command callbacks.
- Best for
- Module / Data / Server
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Android / Display / QR
Android display main board
Display or smart cabinet main board for touch screens, QR workflows, media UI, and peripheral connections.
- Best for
- Android / Display / QR
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Display / Payment / Serial
Display payment main board
Screen payment terminal board with SIM, USB, serial, audio, and API connectivity for scan-to-start machines.
- Best for
- Display / Payment / Serial
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Display / Terminal / API
Display payment main board variant
Another display-controller form factor for payment screens, interactive panels, and connected smart devices.
- Best for
- Display / Terminal / API
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Face / Payment / Screen
Face payment terminal
Terminal-style hardware for face recognition, screen payment, wallet login, or identity-based machine start workflows.
- Best for
- Face / Payment / Screen
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Lock / Relay / Access
Door lock relay controller
Lock, gate, access, room, locker, and timed relay control with QR/API command trigger.
- Best for
- Lock / Relay / Access
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Metering / I/O / Relay
Multi-I/O metering control board
Water, laundry, charging, sensor input, metering, relay output, and equipment-state reporting.
- Best for
- Metering / I/O / Relay
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Charging / Payment / Session
Charging payment controller kit
Charging and payment controller kit for display, card/QR module, relay output, and usage session control.
- Best for
- Charging / Payment / Session
- Supports
- API command, telemetry, webhook, remote status
- Project fit
- Sample test, retrofit, or OEM customization
Machine coverage
Machine scenarios these boards can cover.
Use the real board examples above as building blocks. QuLink maps them to the control, connectivity, data upload, and payment-trigger layer for common unattended machines. AI vision, RFID parking, or highly specialized controllers should be evaluated as OEM projects.
Covered
Vending / Smart Retail Boards
Screen and no-screen vending boards, MDB equipment, PLC vending boards, lift controllers, drop sensors, and smart cabinet control.
MDB gateway / OEM controller
Covered
QR Payment / Payment Box
QR payment screens, payment boxes, card terminals, and scan-to-start controllers that need a payment callback to trigger the machine.
QR/API trigger board
Covered
Timed Pulse / Relay Equipment
Kiddie rides, amusement machines, massage chairs, laundry, car wash, charging sockets, table rooms, and timed relay devices.
Pulse / relay controller
Covered
Machine Data Upload
Status, fault alerts, usage logs, vend results, telemetry, video/result events, and cloud callback data.
Machine data bridge
Custom
Water / Charging / Metered Devices
Water control, liquid dispenser boards, e-bike charging, power metering, time billing, and full-stop charging logic.
OEM control board
Evaluate
AI / RFID / Vision Kits
Face recognition, AI cabinet vision, RFID parking, BLE beacons, and advanced sensing modules.
OEM integrationControl workflow
From your API command to a real machine action.
QuLink sits between your server and the machine interface. Your system sends a command, the board translates it into MDB, pulse, relay, or serial control, then reports the machine result back.
Identify device
Select the machine by device ID, route, cabinet, slot, relay channel, or timed session.
Send command
Your server sends a signed command such as start_session, trigger_relay, unlock, dispense, stop, or query_status.
Run machine
The QuLink board translates the command into MDB, pulse, relay, serial, unlock, or timed-run action.
Report result
The board returns online status, command result, telemetry, fault alerts, vend result, or session data to your cloud.
QuLink QR payment
Add QR payment when the machine needs scan-to-start.
QuLink can provide the QR payment workflow as an add-on. After payment is confirmed, QuLink turns the payment event into the same machine control command.
Generate QR
Create a QR code for a machine, product, price rule, relay channel, or timed session.
Confirm payment
Use QuLink QR payment, or connect your own wallet/provider callback when you already have a payment stack.
Trigger action
After confirmation, QuLink starts, unlocks, dispenses, pulses, or runs the machine and reports the result.
How projects start
A low-friction path from machine photo to working sample.
You do not need a perfect technical brief on day one. Share what the machine should do, send, or report; QuLink can help identify the interface and next test step.
Send machine details
Machine model, board photo, wiring photo, coin/payment module, or target action is enough to begin.
Confirm interface
We check whether it is MDB, pulse, relay, serial, RS485, QR trigger, data upload, or a custom OEM case.
Test sample workflow
Connect a sample board, confirm command/API behavior, verify machine action and data callback.
Move to deployment
Adjust firmware, connector, enclosure, QR payment, or OEM board design for repeat deployment.
Machine categories
Built for equipment where software must trigger a physical action.
Vending and Smart Retail
MDB vend, QR vend, telemetry, inventory event, drop result.
Amusement and Kiddie Rides
Pulse simulation, timed play, token replacement, session start.
Laundry and Service Equipment
Timed relay, cycle start, QuLink QR payment or app callback, machine state event.
Lockers and Charging Devices
Unlock, rent, return, charge session, device online/offline, data upload.
Use-case guides
Search by machine problem, not only by board name.
Start with the featured guides below. Each page explains the machine interface, payment trigger, data upload path, and what to send for a sample test.
How to Add QR Payment to a Vending Machine
A practical path for adding QR payment to vending machines using a machine-side controller, payment callback, vend trigger, and result upload.
Read guideConnect an MDB Vending Machine to an API
Connect MDB vending machines to your backend with API vend commands, payment callbacks, telemetry, and MDB event upload.
Read guideVending Machine QR Payment Board
Connect vending machines to QR payment, API commands, vend triggers, telemetry, and server callbacks without rebuilding the whole vending controller.
Read guideLaundry Machine QR Payment Controller
QR payment and API control board for laundry machines, timed relay start, pulse simulation, session status, and machine data upload.
Read guidePayment Callback to Machine Action
Turn payment approval from your wallet, app, checkout, or backend into a physical machine action with QuLink control boards.
Read guideSelf-Service Machine Data Upload to Cloud
Upload self-service machine telemetry, faults, usage logs, vend results, meter values, and session events to your own cloud.
Read guideFull guide library
All machine-side integration guides.
Browse every use-case page for MDB, QR payment, pulse/relay, data upload, and OEM integration projects.
MDB Vending Machine API Gateway
Connect MDB vending machines to your server with an API-ready gateway for vend commands, telemetry, QR payment triggers, and machine events.
Read guideQR Payment Controller Board for Scan-to-Start Machines
QuLink QR payment controller boards turn payment confirmation into relay, pulse, serial, unlock, dispense, or timed machine actions.
Read guidePulse Relay Controller for Laundry and Timed Machines
API-ready pulse relay controllers for laundry, amusement, massage chairs, car wash, charging sockets, and other timed self-service machines.
Read guideMachine Data Upload IoT Board for Self-Service Equipment
Upload machine status, telemetry, sensor values, fault alerts, usage logs, vend results, and session events from self-service equipment to your server.
Read guideOEM Control Board for Unattended and Self-Service Machines
OEM control board customization for unattended machines: firmware, connector, enclosure, QR payment, API commands, data upload, and production rollout.
Read guideVending Machine QR Payment Board
Connect vending machines to QR payment, API commands, vend triggers, telemetry, and server callbacks without rebuilding the whole vending controller.
Read guideLaundry Machine QR Payment Controller
QR payment and API control board for laundry machines, timed relay start, pulse simulation, session status, and machine data upload.
Read guideMassage Chair Payment Controller Board
Payment and API trigger controller board for massage chairs, timed relay sessions, QR scan-to-start, and session result callbacks.
Read guideKiddie Ride Coin Pulse Controller
API and QR payment controller for kiddie rides, amusement machines, coin pulse simulation, relay output, timed run, and session callbacks.
Read guideSmart Locker Relay Unlock Controller
Relay unlock controller board for smart lockers, cabinets, access doors, QR payment, API unlock commands, and door status upload.
Read guideEV Charging Socket Payment Controller
Payment and API control board for charging sockets, timed power output, metering, QR payment, relay control, and session data upload.
Read guideRS485 Machine Data Upload Board
RS485 and serial machine data upload board for telemetry, fault alerts, metering values, usage logs, and webhook callbacks to your server.
Read guideMDB Cashless Vending Retrofit Board
MDB cashless vending retrofit board for QR payment, wallet callback, API vend command, telemetry, and machine event upload.
Read guideHow to Add QR Payment to a Vending Machine
A practical path for adding QR payment to vending machines using a machine-side controller, payment callback, vend trigger, and result upload.
Read guideConnect an MDB Vending Machine to an API
Connect MDB vending machines to your backend with API vend commands, payment callbacks, telemetry, and MDB event upload.
Read guideQR Payment Retrofit for Coin-Operated Laundry Machines
Retrofit coin-operated washers and dryers with QR payment, pulse or relay start, timed sessions, and session callbacks.
Read guideRelay Controller for Coin-Operated Machines
Use a relay or pulse controller to retrofit coin-operated machines for QR payment, API start, timed sessions, and data callbacks.
Read guidePayment Callback to Machine Action
Turn payment approval from your wallet, app, checkout, or backend into a physical machine action with QuLink control boards.
Read guideSelf-Service Machine Data Upload to Cloud
Upload self-service machine telemetry, faults, usage logs, vend results, meter values, and session events to your own cloud.
Read guideDuitNow QR Vending Machine Payment Controller
Use a QuLink controller board to turn DuitNow QR or wallet payment approval into vending, relay, pulse, or machine start actions.
Read guideUPI QR Payment Controller for Vending Machines
Connect UPI QR payment approval to vending machine vend commands, relay outputs, pulse starts, telemetry, and result callbacks.
Read guideQRIS Vending Machine Payment System Hardware
Machine-side hardware for QRIS vending payment projects: payment callback to vend trigger, relay output, telemetry, and result upload.
Read guidePromptPay QR Payment for Vending Machines
Use QuLink hardware to connect PromptPay QR payment approval to vending, relay, pulse, unlock, or timed machine actions.
Read guideMDB vs Pulse for Vending Machine QR Payment
Compare MDB and pulse retrofit paths for vending machine QR payment, payment callbacks, vend triggers, and machine result upload.
Read guideStatic QR vs Dynamic QR for Self-Service Machines
Compare static QR and dynamic QR payment flows for vending, laundry, lockers, payment boxes, and other scan-to-start machines.
Read guideDeveloper API
Control and data APIs for machine protocols.
Your software team should not need to rebuild MDB timing, pulse width, relay duration, serial frames, telemetry upload, or vend-result handling from scratch.
Commands
start_session, trigger_relay, dispense, unlock, stop, query_status
Data and Events
device.online, command.accepted, telemetry.updated, machine.fault, vend.result, session.completed
POST /v1/devices/{device_id}/commands
{
"command": "start_session",
"source": "api_command",
"machine_action": {
"type": "relay",
"duration_ms": 800
},
"reference_id": "CMD-2026-10492"
}
POST /webhooks/qulink
{
"event": "payment.confirmed",
"device_id": "VM-1049",
"action": "trigger_relay",
"telemetry": {
"online": true,
"last_result": "session_started"
}
}
Technical FAQ
Common questions from machine operators, OEMs, and system integrators.
Can QuLink provide QR payment?
Yes. QuLink can provide QR payment workflows for scan-to-start machines. Customers can also connect their own payment provider, wallet, app, or server callback.
Can QuLink collect machine data?
Yes. QuLink boards can upload status, telemetry, vend results, fault alerts, sensor values, and operation logs to your server.
Which machine interfaces can QuLink connect?
QuLink supports MDB, pulse, relay, UART, serial, RS485, QuLink QR payment workflows, and custom OEM board interfaces.
Who is this built for?
System integrators, machine operators, payment apps, wallet providers, and machine OEMs that want hardware connected to their own backend.
Project RFQ
Send a machine photo. We help identify the board, interface, and next test step.
A machine photo, board photo, or wiring photo is enough to start. We can confirm the machine interface, API workflow, data upload, QR payment or your own payment callback, and sample path in the next step.
A good first message
If you are unsure about the exact interface, send what you have. Photos often answer more than a long spec.
- Machine type and target country
- Machine photo, board photo, or wiring photo
- Action after payment or API command
- Need data upload? expected quantity?
Fastest first step
- Send a machine photo
- Describe the action after API or payment
- Tell us if data upload is needed