Table of Contents
Advertisement
11-10
Command Communications
Status Word
The status word is sent in the direction of slave to master. It is 16 bits
wide and the individual bits are defined as follows:
Fig. 11-16: Structure of the Status 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 slave
recognizes new data when the received toggle bit (control
word) is not equal to the sent toggle bit.
Last:
Last Bit: This bit is set when the last fragment of a data set is
sent. This way, the slave can display to the master that it is
sending the last fragment.
R/W:
Read/Write; Read = 1, The slave sets this bit.
(Copy of the master bit)
Error Bit: This bit indicates an error that has occurred in the slave. The
following data indicate the reason for the error.
C:
Reserved.
Note:
Reserved Bits are to be set to 0.
ECODRIVE03-FL*-04VRS
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: Error Bit
Bit 14: Reserved
Bit 15: C Bit
DOK-ECODR3-FL*-04VRS**-FK01-EN-P
Advertisement
Table of Contents
