"KCS" v3.24.2 firmware BIN file download

[Jan_W]

v3.24.2 improvement:
1: harden remote flash workflow
2: add standard Modbus RTU V2 protocol handler
3: DM32 Tuya DAC DP mapping
4: expand free GPIO DI monitor updates
5: update ifttt "THEN" action number from 12 up to 32.
6: upgrade Nx board ARM CPU energy modbus protocol
7: Nx board KCS monitor and home assistant energy value precision to 0.001kwh

What does „standard Modbus RTU V2 protocol handler” mean? Do You have any examples?