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FINS Commands and Responses
Section 6-4
Command Codes
The command code consists of two bytes of data, and indicates the contents
of the command. A FINS command must begin with a 2-byte command code,
and any parameters must follow the command code.
Response Codes
The response code consists of two bytes of data, and indicates the result of
the command execution. The first byte is the MRES (main response code),
which indicates the broad classification of the execution result. The second
byte is the SRES (sub-response code), which gives the detailed classification.
The following table shows the main response codes and the execution results.
For a more detailed listing of response codes, including the sub-response
codes, refer to 6-7 Response Codes.
Command
Response
Word
Word
1 byte
FINS header
Automatically prepared and added.
2 bytes
2,000 bytes max.
Command code
Text
Controller
Link Unit
CPU Unit
CS/CJ, CVM1,
CV-series,
or CQM1H-
series PC
Computer
Controller Link
Support Board
2 bytes 2 bytes
1,998 bytes max.
FINS header
Automatically
added.
Command
code
Response
code
Text
1 byte
Response
Command
Automatically pre-
pared and added.
1 byte
1 byte
@CMND
S
S+1
S+2
15
87
D
D+1
D+2
15
87
S
D
C
0
0
MRES
Execution result
MRES
Execution result
00
Normal completion
21
Write not possible
01
Local node error
22
Not executable in current mode
02
Destination node error
23
No unit
03
Communications controller error 24
Start/stop not possible
04
Not executable (service not sup-
ported)
25
Unit error
05
Routing error
26
Command error
10
Command format error
30
Access error
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