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FINS Frames Section 7-2
7-2 FINS Frames
The FINS communications service is carried out through the exchange of
FINS command frames and their corresponding response frames. (There are
also commands with no responses.)
Both command frames and response frames are comprised of a FINS header
for storing transfer control information, a FINS command field for storing a
command, and a FINS parameter/data field for storing command parameters
and transmission/response data.
FINS command frames and FINS response frames are used with both FINS/
UDP and FINS/TCP.
FINS Command
Frame Format
FINS Response
Frame Format
FINS Header
Information
ICF (Information Control
Field)
FINS header
FINS command
FINS parameter/data
Parameter/
data field
Size (bytes)
Contents
Displays frame information
Reserved by system.
Permissible number of gateways
Destination network address
Destination node address
Destination unit address
Source network address
Source node address
Source unit address
Service ID
Main request code
Sub-request code
2000 max.
Command parameters and send data
The data length depends on the MRC and SRC.
1
1
1
1
1
1
1
1
1
1
1
1
ICF
RSV
GCT
DNA
DA1
DA2
SNA
SA1
SA2
SID
MRC
SRC
FINS
parameter/data field
FINS header
FINS command
Data
Size (bytes)
Contents
Same as in command frame.
Same as in command frame.
Main response code
Sub-response code
1998 max.
Response data
There are some frames in which
the data length is 0.
10
2
1
1
MRES
SRES
76543210
1 0 0 0 0 0
Bit
Response Request Bit
(0: Response required; 1: Response not required)
Kind of data (0: command; 1: response)