Modbus limits

Octave
#1

Hi,
I want to know the limits on the Modbus RTU and TCP registers.

  • what is the maximum number of registers that can be read at once in TCP and RTU
  • what is the maximum group number of register groups
    Thank you
    Romuald
#2

The maximum number of consecutive registers that can be read in a single register group is 121.
The maximum number of register groups is 1024 (cumulative total across all servers).