11.4
MODBUS RTU Format
11-13
11.4 MODBUS RTU Format
11.4.1 MODBUS RTU Command Format
MODBUS RTU command format
START ADDRESS
FUNCTION DATA CRC
CHECK END
3.5-character
time
8 bits
8 bits
n*8 bits 16
bits
3.5-character
time
ADDRESS
(station no.)
8 bits, 0 to 247 (decimal)
(Note) 0 = Broadcast address
FUNCTION 8
bits
DATA
Varies depending on commands.
CRC 16
bits
END
3.5-character time
(Differs depending on baud rate. Refer to the "reception judgment time" section.)
Reception 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. Reception done judgment time is set at approx. 32 bits of time.
Baud rate
Reception done
judgment time
300
Approx. 106.7 ms
600
Approx. 53.3 ms
1200
Approx. 26.7 ms
2400
Approx. 13.3 ms
4800
Approx. 6.7 ms
9600
Approx. 3.3 ms
19200
Approx. 1.7 ms
38400
Approx. 0.8 ms
57600
Approx. 0.6 ms
115200
Approx. 0.3 ms
230400
Approx. 0.14 ms
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