MODULE FOR INTERFACING SENSOR SUBMERSIBLE HYDROLOGICAL MEASUREMENT SYSTEMS USING A MODBUS INTERFACE

Authors

  • A. L. Olenin Shirshov Institute of Oceanology, Russian Academy of Sciences

DOI:

https://doi.org/10.29006/1564-2291.JOR-2025.53(4).14

Keywords:

hydrological complex, Modbus, sensor, data acquisition system, data parsing, two-wire bus

Abstract

A functional diagram of a modified sensor interface module for a submersible measuring hydrological complex with certain functional advantages is presented. It consists of a set of interface controllers and RS-232 protocols in Modbus that collect data from sensors via RS232 interfaces. The controllers perform the conversion of the RS232-RS485 interface, the conversion of the protocol and the exchange rate of various digital sensors into a single Modbus protocol. The controllers are implemented on the basis of widely used off-the-shelf microcontroller boards. The controllers are connected to a Modbus RTU bus based on an electrical two-wire RS485 interface. Data from the Modbus registers of the controllers is read by the network wizard, which can be, for example, the interface software of the ship computer of the complex operator with time reference to the current operating system time. An operational mock-up of the module for sensor integration has been designed and manufactured to provide background hydrophysical measurements during underwater reconnaissance surveys in coastal waters, and its simplified electrical circuit and appearance are presented. Additional sensors are being connected by adding new controllers to the network. It is possible to connect ready-made measuring devices with a third-party Modbus RS485 interface. The module is part of the battery-powered sounding equipment and is used in the ongoing marine expeditionary work of the IO RAS.

References


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Downloads

Published

2025-12-21

Issue

Vol. 53 No. 4 (2025): Journal of Oceanological Research

Section

Marine techniques

License

Transfer of copyrights occurs on the basis of a license agreement between the Author and Shirshov Institute of Oceanology, RAS