Modbus Slave Serial Channel Tag

Help Contents

Introduction

The Modbus Slave Serial Channel Tag Channel Tag Icon provides a serial SCADA communication channel that receives and processes Modbus commands from other Modbus drivers.

Configuration Properties

The Modbus Slave serial channel supports the properties of the Modbus Slave Channel Tag plus these properties:

Property Type Version Description
Port WSTRING 3.10 The name of the communications port. For example 'COM1:'
Mode WSTRING 3.10 The serial port communication speed, data format and handshake mode.
Click the Browse button Browse button to edit the serial port mode using the Serial Port Mode Editor. You can also type in the serial port mode string directly. See Serial Port Mode String for how this property is formatted.
Protocol USINT 3.10 The communications protocol. 0 = Modbus RTU, 1 = Modbus ASCII.

Tag Commands

The Modbus Slave Serial Channel Tag supports the tag commands of the Modbus Channel Tag.

Example Configuration

This is an example of channel configuration suitable for Modbus RTU:

PropertyValue
PortCOM1
ModeBaud=9600 Parity=N Data=8 Stop=1
ProtocolModbus RTU

Notes:

Relationships to Other Tag Types

The Modbus Slave Serial Channel Tag builds on the features of these tag types:

Further Information

Passive Channel Tag

To learn about the properties common to all passive channel types.

Modbus Slave TCP Channel Tag

To learn about Modbus Slave TCP Channel Tags.

Modbus Slave Device Tag

To learn about Modbus Slave Device Tags that can be associated with Modbus Slave Serial Channels.

Serial Communications

For background information on serial communications.

Serial Port Mode Editor

To learn how to set the communications speed, data format, and handshake mode of the serial port.

Glossary

For the meaning of terms used in Fernhill SCADA.