RS485 Interface
5.2.3
Master: Request Data
Byte:
Value:
DA = Destination address = slave address = 0x7E
SA = Source address = master address = 0x01
FCS = Checksum = 0x7E+0x01+0x43 = 0xC2
Slave: Response Data
Byte:
Value:
LE
DA
SA
FCS = Checksum = 0x01 + 0x7E + ....
capaNCDT 61xx/IP
Example of the Measuring Value Transmission
SD
DA
0x10
x
SD
LE
0x68
0x13
= Length = 16 data bytes + 3 bytes (DA, SA, FC) = 19 bytes = 0x13
= Destination address = master address = 0x01
= Source address = slave address = 0x7E
SA
FC
FCS
x
0x4C
x
FCS
LE
SD
DA
rep
rep
0x13
0x68
0x01
ED
0x16
SA
FC
Data
0x7E
0x08
e.g.
16 bytes
FCS
FCS
ED
x
0x16
Seite 32
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