ModBus ASCII
WebHMI supports various devices using the ModBus ASCII protocol
Version 1.5 supports 4 types of ModBus regisers :
Содержание
Cxx - Coils
Flag registers
ModBus functions: read - 0x01, write - 0x05
Data type: Bit
Register range: 0 <= xx <= 65535
Examples: C0, C12, C65535
DIxx - Discrete Inputs
Digital input registers
ModBus function: read- 0x02
Data type: Bit
Registers range: 0 <= xx <= 65535
Examples: DI0, DI2, DI65535
HRxx - Holding Registers
Holding Registers.
ModBus functions : read - 0x03, write - 0x06
Data type: Word
Registers range: 0 <= xx <= 65535
Examples: HR0, HR1, HR2, HR65535
MHRxx - Multiple Holding Registers
These registers identical to HRxx. The difference is that for write operations Modbus #16 (Preset Multiple Register) function is used.
IRxx - Input Registers
Регистры регистров ввода.
Функции ModBus: чтение - 0x04
Тип данных: Word
Диапазон регистров: 0 <= xx <= 65535
Примеры регистров: IR0, IR1, IR2, IR65535
