Confirm protocol
Collect the RS485 wiring, baud rate, parity, slave ID, and register or frame map.
Guides
RS485 to 4G
RS485 to 4G gateway for machine data and remote commands.
Use QuLink when a PLC, cabinet controller, sensor, or legacy RS485 machine needs cellular data upload and remote commands without a local PC.
RS485 / Modbus4G uploadRemote commandsOTA-ready
Part of Machine Data Upload IoT Board for Self-Service Equipment
Project fit
For remote sites, PLCs, and legacy RS485 equipment
Buyer signals
- Machines with RS485 or Modbus RTU interfaces.
- Sites without reliable local network or PC.
- Projects that need telemetry, alarms, or remote commands.
- Fleets that need OTA-ready hardware and device identity.
What to send first
- Machine photo or existing board photo
- Interface or wiring note if available
- Target action after API command or payment
- Whether telemetry or data upload is required
Not the right fit if
- You only need a pure payment acquiring account and no machine-side control.
- There is no physical machine action after payment, booking, or API approval.
- The project has no machine photo, board photo, wiring note, or interface clue yet.
Integration model
RS485 frames become cloud data
QuLink reads or writes RS485 registers and frames, then publishes telemetry and events over 4G. Protocol details and register maps are confirmed per machine.
- Machine interface
- RS485 half/full duplex, Modbus RTU/ASCII or custom frames (project-dependent)
- Connectivity
- 4G cellular, SIM, antenna, OTA-ready profile
- Commands
- read registers, write register, relay output, query status
- Data returned
- telemetry, register values, fault, heartbeat, online/offline
- Project mode
- remote monitoring, PLC integration, OEM gateway
Workflow
From machine interface to API-controlled result.
Map data points
Define which values are read, written, logged, or alarmed.
Install and connect
Confirm SIM, antenna, power, enclosure, and network coverage.
Test remote flow
Verify polling, write commands, reconnect behavior, and alarm upload.
API example
A clear server command or webhook for the machine-side action.
The exact command fields depend on machine interface, firmware profile, and whether payment or your own app triggers the action.
POST /v1/devices/RS485-07/commands
{
"command": "read_registers",
"source": "api_command",
"machine_action": {
"slave_id": 1,
"register": 40001,
"count": 4
}
}
Project RFQ
Send a machine photo. We help identify the board, interface, and next test step.
Send the machine model, RS485 wiring, protocol and register map, data points, installation country, and quantity.
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
FAQ
Questions buyers usually ask before a sample test.
Does QuLink support Modbus RTU?
Support depends on the board and firmware profile. Send the register map, baud rate, and slave ID so we can confirm the integration.
Can it work without WiFi?
Yes, a 4G profile can be used where cellular coverage and SIM policy allow.
Can it both read and write registers?
Yes, read and write commands can be scoped per project, with safety and permission rules.
Can it upload alarms?
Yes. Fault, threshold, and device status events can be published to your backend.
Related use cases