About Modbus Serial

Introduction

Communicating via Modbus enables data exchange between all devices connected to the bus. The Modbus Serial is a protocol that creates a hierarchical structure (one master and several slaves).

The master manages all exchanges in two ways:

The master exchanges with the slave and awaits a response.
The master exchanges with all the slaves without waiting for a response (general broadcast).

NOTE: Be careful that two masters (on the same bus) do not send requests simultaneously otherwise the requests are lost and each report will have a bad result which could be 16#0100 (request could not be processed) or 16#ODFF (slave is not present).

WARNING

CRITICAL DATA LOSS

Only use communication ports for non-critical data transfers.

Failure to follow these instructions can result in death, serious injury, or equipment damage.