# How to connect existing RS-485 instruments to LoRaWAN with EdgeBus — ManThink

> Confirm electrical interfaces and protocols, choose the right collector, then implement reading and processing with EdgeBus / JS. Matching interfaces do not mean matching protocols; existing adapters still need verification for the specific device configuration.

Canonical: https://www.manthink.cn/en/resources/edgebus-retrofit-checklist/

Technical articles / EdgeBus · RS-485 · RETROFIT EXISTING EQUIPMENT

Confirm electrical interfaces and protocols, choose the right collector, then implement reading and processing with EdgeBus / JS. Matching interfaces do not mean matching protocols; existing adapters still need verification for the specific device configuration.

Based on official product documentation  ·  Updated 2026-09-25

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## Get the device protocol before choosing a collector

RS-485 defines an electrical interface, not the instrument’s registers, commands or data semantics. Before starting, obtain the model, communication settings, protocol documentation and required data points. Even if an EdgeBus adapter already exists, confirm its model, protocol version and supported functions.

- Device interface, power supply and communication address.
- Baud rate, parity and supported communication protocol.
- Required data fields, units, scaling factors and exceptional values.
- Data update rate, acquisition interval and permitted polling methods.

## Match the collector to the site

Consider KC25 for DIN-rail RS-485 installations, or KC21 when selecting RS-485 acquisition by power and mounting conditions. For M-Bus equipment, use a matching product such as KC22. Meters with different physical interfaces cannot simply share the same type of port.

Check the exact model and configuration for the collector’s ability and limits when powering external equipment. Purely mechanical instruments also need an accessible electrical signal output before they can join this data path.

## Turn the protocol into verifiable acquisition logic

EdgeBus runs acquisition and processing programs on the collector. AI can help interpret protocols and write JavaScript, but returned data must still be checked against the device manual, field readings and sample messages. Programs should handle communication failures, data validation and unit conversions.

Organize acquisition and reporting around application needs instead of forwarding every serial response unchanged. Before deployment, assess data volumes, reporting intervals and network conditions, and retain program versions and configuration records.

## Validate the complete path with one device

- Read the instrument and compare raw responses with its actual readings.
- Check parsing, units, scaling and error handling.
- Connect to ThinkLink through a LoRaWAN gateway and verify the data fields.
- Verify that data updates meet the needs of dashboards, alerts and workflows.
- Record the configuration and validation results before adding more devices.

Use the official ThinkLink documentation for full protocol and development guidance. Integration feasibility depends on device protocols, firmware capabilities and on-site validation.

## Sources

Refer to the corresponding official documentation and confirmed configuration for exact models, interfaces and options.

- [Official EdgeBus technical overview](https://www.think-link.net/zh/edgebus/)
- [Integrated device list](https://www.think-link.net/zh/devices/)
- [KC25 Official manual](https://www.think-link.net/docs/zh/Device/LoRaWANEBCollector/kc25)
- [KC21 Official manual](https://www.think-link.net/docs/zh/Device/LoRaWANEBCollector/kc21)
- [KC22 Official manual](https://www.think-link.net/docs/zh/Device/LoRaWANEBCollector/kc22)

## Related products

[Explore products ↗](https://www.manthink.cn/en/products/)

[![KC25 — product image](https://www.manthink.cn/assets/kc25.jpg)
**KC25**  DIN-rail RS-485 collector](https://www.manthink.cn/en/products/collectors/kc25/) [![KC21 — product image](https://www.manthink.cn/assets/kc21.png)
**KC21**  IP65 RS-485 collector](https://www.manthink.cn/en/products/collectors/kc21/) [![KC22 — product image](https://www.manthink.cn/assets/kc22.png)
**KC22**  IP65 M-Bus collector](https://www.manthink.cn/en/products/collectors/kc22/)

Confirm your selection against the site’s interfaces and installation conditions.

[Discuss product selection ↗](mailto:info@manthink.cn?subject=How+to+connect+existing+RS-485+instruments+to+LoRaWAN+with+EdgeBus+%C2%B7+Product+selection+inquiry&body=)