Driver documentation
The extract below from the North documentation shows compatible equipment, available values, and prerequisites.
Download the full documents: Autometers Application Note (PDF, 15 pages). Modbus Driver Manual (PDF, 36 pages).
Technical summary
| Driver version | Modbus v3.1 |
|---|---|
| Physical connection | RS485 RS485 connections require an RS232-485 converter. |
| Interface licence | Free to use Starting the driver does not require an interface licence. |
| Available on Commander | Factory installed Firmware updates available via cloud update and included with ObSys engineering software. |
| Available on ObSys |
Software
ObSys engineering software
ObSys Setup provides a complete toolkit for configuring the Modbus driver, including firmware updates, drivers, and documentation.
ObSys released July 2026 (130 MB)
Download ObSys Setup
Version history
Build 2025.01.21
Modbus Server: Improved documentation generation for third-party integrations; clarified signed/unsigned integer registry boundaries.
Modbus Client: Added a decoding option for isolating a single register from a multi-register read loop.
Modbus Client: Introduced connection caching and TCP keep-alive options.
Modbus Client: Resolved a request/response timing mismatch observed on high-speed serial links.
Build 2023.03.01
Fixes an issue decoding 4-register (8-byte) values.
Build 2022.11.16
To improve security, Modbus TCP server is disabled by default.
Build 2022.06.01
TCP Server Setup driver object returns full label from Essential Data.
Build 2021.04.04
Fixed an issue with the Modbus server, negative values incorrectly read as ‘-1’.
Build 2020.06.01
Added O, P, and Q decode types.
Resolved an occasional rounding error when writing to register value using a formula.
Corrected issue with ObView pages only referencing registers 0-99.
Build 2019.12.02
New version
Incorporates features from our existing range of Modbus drivers (Modbus, ModbusTCP, and ModbusSlave) replacing them with a single unified driver.
Getting help
Whether you have a specific driver query, a question about a North device, or are simply looking for general advice on how our products can help your project, our team is here to assist.
Get in touch. We are always happy to help.