Supported Modbus Function Codes
Serial communications protocol provided by SD300 drive adhere to Modbus.
The drive uses four reading and writing functions from all of the functions
that exist in Modbus protocol. These are:
The implementation of these function codes allows reading up to 120
registers from a Parameter Group using a single frame. If you want to access
to a consecutive memory registers, but belonging to different groups, you
should access in as many frames as groups are involved.
Modbus Function Code Nº 3: Registers Reading
This function code allows the Modbus controller (master) to read the
content of the data registers indicated in the drive (slave). This function
code only admits unicast addressing. Broadcast or groupcast addressing
are not possible with this function code.
The implementation of this function code in the drive allows reading up to
120 registers with consecutive addresses of the drive in a single frame.
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