Modbus

About Modbus

With Modbus, you can use either ASCII frames or RTU frames, or both at at the same time if you have multiple serial interfaces. Micrium's Modbus module supports any number of communications channels.

Modbus-S is a Modbus Slave (server) software component enabling an embedded system to communicate to a Modbus Master (client).

Modbus-M is a Modbus Master (client) component that enables communication to a Modbus Slave.

Micrium's Modbus module enables a developer to read or write integer, floating-point (assuming Daniels extensions) and discrete values from and to the target system.

Key Features

The features of Micrium's Modbus module include:

• Allows for multiple RS-232C and/or RS-485 ports on the same target (limited only by the number of serial ports available)
• The baud rate for each port is independently adjustable.
• Select either Modbus ASCII or RTU on a per-channel basis.
• Easily assign nearly any application variable to any Modbus holding register (up to 65536), input register (up to 65536), coil (up to 65536) or input status (up to 65536).
• Complete, clean ANSI C source code included
• Scalable from 6K to 15K bytes. Compile only the function codes necessary for the target.
• Works with any CPU (8-, 16-, 32-, 64-bit or DSP)
• Works with or without an RTOS kernel
• Easily configurable