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MODBUS RTU command message frame
START
ADDRESS
FUNCTION
3.5-character time
8 bits
8 bits
ADDRESS (Unit No.)
FUNCTION
DATA
CRC
END
DATA
n*8 bits
CRC CHECK
16 bits
END
3.5-character time
8 bits, 0 to 99 (decimal)
Note1) 0= Broadcast address
Note2) Slave unit No. is 1 to 99 (decimal)
Note3) For MODBUS, 0 to 247 (decimal)
8 bits
Varies depending on commands.
16 bits
3.5-character time (Differs depending on baud rate. Refer to reception
judgement time.)
Response in normal status
The same message as a command is returned for single write command.
A part of a command message (6 bytes from the beginning) is returned for multiple write command.
Response in abnormal status
In case a parameter disabled to be processed is found in a command (except transmission error)
Slave address (unit number)
Function code + 80H
Error code
CRC
One of either 1, 2 or 3
Error code contents
1: Function code error
2: Device number error (out of range)
3: Device quantity error (out of range)
Reception done judgment time
The process for receiving a message completes when the time that is exceeding the time mentioned
below has passed after the final data was received.
Baud rate
2400
4800
9600
19200
38400
57600
115200
Reception done judgment time
Approx. 13.3 ms
Approx. 6.7 ms
Approx. 3.3 ms
Approx. 1.7 ms
Approx. 0.8 ms
Approx. 0.6 ms
Approx. 0.3 ms
Note) The reception done judgment time is an approx. 32-bit time.
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