Modbus - Libelium Waspmote Technical Manual

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21.4. Modbus

The Modbus is a software library that can be operated physically on the RS-485 modules. Thus, Modbus is a
software layer which provides with interesting services.
Technical details:
Protocol: Modbus
Data area: Up to 255 bytes per job
Interface: Layer 7 of the ISO-OSI reference model
Connector: DB9 (RS-485 module)
Number of possible connections: up to 32 in multi point systems
Frame format: RTU
Applications:
Multiple master-slave applications
Sensors and Instruments
Industrial Networking
Building and infrastructure
Transportation and energy applications
Related API libraries:
Wasp485.h, Wasp485.cpp
ModbusMaster.h, ModbusMaster.cpp
ModbusSlave.h, ModbusSlave.cpp
All information about their programming and operation can be found in the
Modbus Communication
All the documentation is located in the Development section in the Libelium website.
Guide.
RS-485 Communication Guide
-114-
Industrial Protocols
Figure: RS-485 module
and
v8.2

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