28
Manual – MOVIDRIVE® MDX60B/61B Communication and Fieldbus Unit Profile
4
MOVILINK® protocol via RS485 transmission method
Serial Interfaces of MOVIDRIVE® B
Creating the block
check character
The following figure gives an example of how a block check character is created for a
cyclical telegram of type PDU 5 with 3 process data words. The EXOR logic operation
of the characters SD1 - PD3
low
results in the value 57
hex
as the block check character
BCC. This block check character will be sent as the last character of the telegram. The
recipient checks the character parity after having received the individual characters.
Next, the block check character is created from the received characters SD1 - PD3
low
according to the pattern described above. The telegram has been correctly transmitted
if the calculated and received block check characters are identical and there is no
character parity error. Any other result will be displayed as a transmission error.
01494BEN
SD1: 02 hex
ADR: 01 hex
TYP: 05 hex
PD1 high: 00 hex
PD1 low: 06 hex
PD2 high: 3A hex
PD2 low: 98 hex
PD3 high: 01 hex
PD3 low: F4 hex
57 hex
S
top
Parity
S
tart
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1
0
0
1
0
0
0
0
0
0
1
1
0
1
1
0
0
0
0
0
1
1
0
0
0
0
0
1
0
1
0
0
0
1
1
1
0
0
0
1
1
0
0
0
1
0
1
1
0
0
0
0
1
0
1
EXOR
EXOR
EXOR
EXOR
EXOR
EXOR
EXOR
EXOR
calculated BCC:
TIP
For a description of process data and the structure of the 8-byte parameter data
channel, refer to chapter "SEW unit profile".
Summary of Contents for MOVIDRIVE MDX60B
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