VEGA VEGABAR 87 Modbus and Levelmaster protocol - Operating Instructions - Manual (Page 66)

66
10 Supplement
VEGABAR 87 • Modbus and Levelmaster protocol
46297-EN-131107
FC6 Write Single Register
With this function code an individual holding register can be written.
Request:
Parameter Length Code/Data
Function Code 1 Byte 0x06
Start Address 2 Bytes 0x0000 to 0xFFFF
Number of Registers 2 Bytes Data
Response:
Parameter Length Code/Data
Function Code 1 Byte 0x04
Start Address 2 Bytes 2*N
Register Value 2 Bytes Data
FC8 Diagnostics
With this function code different diagnostic functions can be triggered or diagnostic values read out.
Request:
Parameter Length Code/Data
Function Code 1 Byte 0x08
Sub Function Code 2 Bytes
Data N*2 Bytes Data
Response:
Parameter Length Code/Data
Function Code 1 Byte 0x08
Sub Function Code 2 Bytes
Data N*2 Bytes Data
Implemented function codes:
Sub Function Code Name
0x00 Return Data Request
0x0B Return Message Counter
With sub function codes 0x00 only one 16 bit value can be written.
FC16 Write Multiple Register
With this function code, several holding registers can be writen. Only registers can be written in an
enquiry which are immediately consecutive. If there are gaps (registers do not exist) between the
registers, then they cannot be written in a telegram.