Document reference MAODS301/E
USER MANUAL
Edition 4 - May 2022
SpeedSys300 ODS301 overspeed detection system
6 - 1
Introduction
MODBUS COMMUNICATIONS WITH A SPEEDSYS300 ODS301
6 MODBUS COMMUNICATIONS WITH A SPEEDSYS300
ODS301
This section provides an overview of the Modbus communications interface supported by the
SpeedSys300 ODS301 module.
6.1 Introduction
The SpeedSys300 ODS301 module implements a Modbus server in order to allow the
sharing of module information with external third-party systems, such as a DCS or PLC.
For communication with its Modbus server, the module provides a Modbus RTU serial
(RS-485, half-duplex (2-wire)) interface, that is available on the MODBUS RS485 connector.
See
2.2 SpeedSys300 ODS301 module connectors
for further information on the
MODBUS RS485 connector.
The default communication parameters for the SpeedSys300 ODS301 module’s
Modbus RTU interface are:
•
Modbus address:
1 (slave).
•
Modbus transmission speed: 19200 (baud rate).
•
Number of data bits:
8.
•
Number of stop bits:
1.
•
Modbus parity check:
None.
•
Modbus line termination:
Inactive.
All of these communication parameters, except for number of data and stop bits, can be
changed if required using the SpeedSys300 software. See
for further information.
The data transmitted by the module consists of real-time measurement values (speed,
acceleration, alarms and so on), status and/or configuration information. This data is typically
used by external systems for the purposes of machinery monitoring. See
for detailed Modbus register definitions and mapping information.
It is important to note that SpeedSys300 ODS301 module’s Modbus interface is read only and
cannot be used to change the configuration or operation of the ODS301 module.
NOTE:
The SpeedSys300 ODS301 module’s Modbus interface is read only and the
information to be shared is defined by the ODS301 module’s configuration.
Содержание vibro-meter SpeedSys300 ODS301
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