Tabla de contenido
Publicidad
Idiomas disponibles
Idiomas disponibles
Dynamic Fluid Measurement
CAPITULO 4: MODBUS DATA
MODBUS PROTOCOL
TRANSMISSION MODE
DATA BITS
START BITS
PARITY
STOP BITS
ERROR CHECKING
BAUD RATE
ASCII FRAMING
Framing is accomplished by using colon (:) character indicating the beginning of frame and carriage (CR),
line feed (LF) for the end of frame
ASCII MESSAGE FORMAT
ADDRESS
:
2 CHAR
8 BITS
16 BITS
RTU FRAMING
Frame synchronization is done by time basis only. The Smart Flow Computer allows 3.5 characters time
without new characters coming in before proceeding to process the message and resetting the buffer.
RTU MESSAGE FORMAT
ADDRESS
8 BITS
E-CHART Manual
ASCII
EVEN, ODD
LRC
1200-9600
FUNCTION
DATA
2 CHAR
Nx2 CHAR
16 BITS
Nx16 BITS
FUNCTION
8 BITS
www.dynamicflowcomputers.com
RTU
7
8
1
1
NONE
1
1
CRC
1200-9600
ERR\CHECK
2 CHAR
16 BITS
DATA
CRC
Nx8 BITS
16 BITS
Modbus Data — 4-1
CR
LF
8 BITS
8 BITS
Publicidad
Tabla de contenido
