Tightening Technology | Bosch Rexroth AG 95/263
7.5.2 Message structure
A message in the Rexroth Open Protocol has an ASCII format structure and consists of:
• Header (see Table 7–1)
• Data (see Tables 7–2, 7–3 and 7–4)
• End character (see Table 7–5)
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 length + 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 is not set (value = 0), the tightening system will ex-
pect acknowledgement of the messages.
Unreliable mode:
If the No Ack Flag is set (value = 1), the tightening system will not ex-
pect acknowledgement of the messages.
1
Reserve Reserved space for future header expansions.
This space must be filled with eight characters, which will not be eval-
uated (e. g. 00000000).
8
Header length
20
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