Fins-Mini Structure - Omron S8AS User Manual

Frame Structure
Invalid Subaddress and BCC
6-2-3

FINS-mini Structure

PDU Structure
Type Code
(Variable Type)
94
■
Command
Node No. Subaddress
0 1 0
STX
■
Response
Node No. Subaddress
0 1 0
STX
The end code is 13 (BCC error).
There was a subaddress error, but the BCC error has a higher error priority.
The FINS-mini command text and response text provides the contents of the
command and response communications.
The MRC (Main Request Code), SRC (Sub-Request Code), and any required
data are transmitted in the command frame.
■ Service Request PDU
MRC SRC
The MRC and SRC shown above, MRES (Main Response Code), SRES
(Sub-Response Code), and the response data are transmitted in the
response frame.
■
Service Response PDU (Normal Response)
SRC
MRC MRES
If the specified FINS-mini command could not be executed, service response
PDU will contain only the MRC/SRC and MRES/SRES.
■
Service Response PDU (Specified FINS-mini Command Not Executed)
SRC
MRC MRES
The MRES and SRES become the response code when the command was
not completed normally.
The following table shows the variable area type codes.
Variable type
80 R
81 R/W
BCC
A Err
ETX
End code
0
1 3
ETX
Data
Data
SRES
SRES
R/W Size
Word
Word
Section 6-2
BCC
Contents
Monitored values and alarm status
Setting and checking set values