Seite 30
RS485 Interface
capaNCDT 61xx/IP
5.2.1
Reading Measuring Values
Master: Request Data
Byte:
SD
DA
SA
FC
FCS
ED
Value:
0x10
x
x
0x4C
x
0x16
FCS
Slave: Response Data
Byte:
SD
LE
LE
rep
SD
rep
DA
SA
FC
Data[]
FCS
ED
Value:
0x68
x
x
0x68
x
x
0x08
x
x
0x16
FCS
Abbreviations:
SD
StartDelimiter (0x10: telegram without data; 0x68 telegram with variable length)
LE
Length (number of bytes without SD, LE, LErep, SDrep, FCS, ED)
LErep
LE repeated
SDrep
SD repeated
DA
Destination Address /default 0x7E)
SA
Source Address (e.g. 0x01)
FC
Function Code
FCS
Checksum (sum of all bytes without SD, LE, LErep, SDrep, FCS, ED; without overflow, only 8 bits)
ED
EndDelimiter
Data[] - Measuring data (little endian)
