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FINS Commands Section 5-3
Note For CompoWay/F, set SID 0 (1-byte ASCII: 30 hex) in the leftmost
byte of S+3 and the most significant digit of the CompoWay/F com-
mand code's MRC (1-byte ASCII) in the rightmost byte of S+3. Set
the least significant digit of the CompoWay/F command code's MRC
(1-byte ASCII) in the leftmost byte of S+4 and the most significant
digit of the CompoWay/F command code's SRC (1-byte ASCII) in the
rightmost byte of S+4. Be sure to set the remaining data with this 1-
byte offset as well.
5-3-47 CONVERT TO MODBUS-RTU COMMAND: 28 04
When this command is sent to serial port 1 or 2 on an Option Board of a CP-
series CPU Unit, or a serial port on a Serial Communications Unit/Board (ver-
sion 1.2 or later), the CPU Unit or Serial Communications Unit/Board removes
the FINS header and sends the enclosed Modbus-RTU command.
With this command, OMRON components connected to a PLC through Mod-
bus-RTU communications can be accessed from a PLC or PT by sending a
FINS message containing a Modbus-RTU command.
Execution Conditions
Command Format
Response Format
Parameters Command
Slave Address
Specify the Modbus-RTU device address. Set the address in hexadecimal
between 01 and F7 hex (1 to 247 decimal).
Function Code
Specify the function code of the Modbus-RTU command. Set the address in
hexadecimal between 01 and FF hex (1 to 255 decimal).
Communications Data
Specify the required parameters associated with the function code. The
amount of communications data varies. (In some cases, there is no communi-
cations data.)
Response
The response is the same as the command except that it contains an end
code.
Access right at
other device
UM read
protection
DIP switch UM write
protection
Network write
protection
OK OK OK OK
RUN mode MONITOR mode PROGRAM mode
OK OK OK
28 04
Command
code
Slave
address
Function
code
Communications
data
28 04
Command
code
End code
Slave
address
Function
code
Communications
data
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