235
FINS Commands Section 5-3
Note For Modbus-RTU, set the Modbus-RTU Slave address (1 byte) in the
leftmost byte of S+1 and the function code (1 byte) in the rightmost
byte of S+1.
5-3-48 CONVERT TO MODBUS-ASCII COMMAND: 28 05
When this command is sent to a serial port on a Serial Communications Unit
or Board (Ver. 1.2 or later), the Serial Communications Unit/Board removes
the FINS header and sends the enclosed Modbus-ASCII command.
With this command, OMRON components connected to a PLC through Mod-
bus-ASCII communications can be accessed from a PLC or PT by sending a
FINS message containing a Modbus-ASCII command.
Execution Conditions
Command Format
Response Format
Parameters Command
Slave Address
Specify the Modbus-ASCII device address. Set the address in ASCII between
01 and F7 hex (3031 to 4637 ASCII), which is 1 to 247 in decimal.
Function Code
Specify the function code of the Modbus-ASCII command. Set the address in
ASCII between 01 and FF hex (3031 to 4646 ASCII), which is 1 to 255 in dec-
imal.
Communications Data
Specify the required parameters (in ASCII) associated with the function code.
The amount of communications data varies. (In some cases, there is no com-
munications 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 05
Command
code
Slave
address
(ASCII)
Function
code
(ASCII)
Communications
data (ASCII)
28 05
Command
code
End code Slave
address
(ASCII)
Function
code
(ASCII)
Communications
data (ASCII)
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