Basic Format Of Data Transfer - YASKAWA VS mini V7 User Manual

5.2

Basic Format of Data Transfer

The basic format for transferring data is as follows.
The size of the header for a data link layer is fixed at two bytes.
By setting pin 2 on DIP switch S1, either 17 bytes (17-byte mode) or 32 bytes (32-byte
mode) can be selected as the data size for the data link layer. If 32-byte mode is selected,
only the first 29 bytes are used as application data.
* The first 30 bytes are used only when the INV_I/O sub-command is used.
+00H
+01H
+02H
+03H
+04H
+11H
+12H
+00H
+01H
+02H
+03H
+04H
+11H
+12H
+13H
+14H
+1FH
+21H
Command data
Station address +00H
+01H
Control code
Command code +02H
− +03H
+04H
+06H
Data
+11H
WDT
+12H
Basic format of data transfer (17-byte mode)
Command data
+00H
Station address
+01H
Control code
+02H
Command code
− +03H
+04H
Data
+11H
WDT
+12H
Sub-command
−
+13H
+14H
Data
+1FH
Not used.
+21H
Basic format of data transfer (32-byte mode)
19
Response data
Station address Header of
data link layer
Control code
Response code
Alarm
Status
Data link layer data
and application layer
Data
EWDT
Response data
Station address
Header of data link layer
Control code
Response code
Alarm
Status
Application layer
Data
EWDT
Sub-command
Sub-status
Data in data link layer
Data
Not used.
5 Transmission Interface