Service Data Channel - Bosch Rexroth OptiFeed-FS EcoDrive 03 FLP04VRS Functional Description

ECODRIVE03-FL*-04VRS

Service Data Channel

Reading a Datum
Writing a Datum
Structure of the Control Word in
the Service Data Channel
Control Word
DOK-ECODR3-FL*-04VRS**-FK01-EN-P
All the programs, parameters, variables and status information can be
sent to the slave or read out via this channel.
The data exchange occurs after the ASCII Data Protocol of the 'Serial
Interface.' The checksum and 'CR LF' at the end of the protocol were
disregarded. The station number is not checked.
1. Read request (e.g. ? N0000)
2. Readout of the requested datum
1. Write request
2. Readout of the response telegram Å Read
Handling the Service Data Channel
The control word is sent in the direction of master to slave. It is 16 bits
wide and the individual bits are defined as follows:
Fig. 11-15: Structure of the Control Word in the Service Data Channel
The individual bits are defined as follows:
Format: These bits indicate the meaning of the transmitted data.
Currently, only one format (B) exists.
Length: These four bits indicate the length of the valid data byte in the
Service Data Channel, not including the control word. The
content of the invalid data is not defined.
Toggle: This bit changes its status for each new cycle. It is used for a
software handshake between master and slave. The master
may only send this bit if the toggle bit in the status word has
the same status as in the control word that was just sent.
Last: Last Bit: This bit is set when the last fragment of a data set is
sent. This way, the slave can recognize that it can assemble
and edit the previously collected fragments.
R/W: Read/Write; Read = 1, The master sets this bit when it would
like to read data.
C: Reserved. (Always 0)
Note: Reserved Bits are to be set to 0.
Command Communications
Å Write
Å Read
Å Write
Bit 0 - 3: Format
Bit 4 - 7: Length
Bit 8: Toggle
Bit 9: Reserved
Bit 10: Last Bit
Bit 11: Reserved
Bit 12: R/W Bit
Bit 13: Reserved
Bit 14: Reserved
Bit 15: C Bit
11-9