80
Bosch Rexroth AG
| Tightening Technology
3 608 870 A47
Nexo cordless Wi-Fi nutrunner
| 3 608 870 A47/2019-10
7.5.2
Message structure
A message in the Rexroth Open Protocol has an ASCII format structure and consists of:
•
Header (see Table
)
•
Data (see Tables
,
•
End character (see Table
)
The following table explains the message structure.
The following tables explain the data structure.
Table 7–1:
Message structure in the Open Protocol (header)
Header components
Meaning
Bytes
Message length
Header data length
Value range: 0000 – 9999
Example:
4
Header length
20 bytes
Data length
37 bytes
Value
0057
MID (message ID)
Describes how the sent message should be interpreted. Each
message ID is assigned to a specific message.
Value range: 0000 – 9999
Example:
4
Value
0002
Message
Acknowledgement of communication start
Revision
Is required if different versions are available for the same MID.
Value range: 000 – 999
Example:
3
Revision
1
Value
001
No ack flag
Only for subscription MIDs
Presetting: 0
Reliable mode:
If the No ack flag has not been set (value = 0), the tightening system
will expect acknowledgement of messages.
Unreliable mode:
If the No ack flag has been set (value = 1), the tightening system will
not expect acknowledgement of messages.
1
Reserve
Reserved space for future header expansions.
This space must be filled with eight characters, which will not be
evaluated (e. g. 00000000).
8
Header length
20
