Modbus Rtu Format; Modbus Rtu Command Format; Modbus Rtu Response Format - Panasonic FP-XH Series User Manual

10.3 MODBUS RTU Format

10.3 MODBUS RTU Format

10.3.1 MODBUS RTU Command Format

■

MODBUS RTU Command Format

START
3.5-character
time
ADDRESS (Unit
No.):
FUNCTION:
DATA:
CRC:
END:
■
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 time for approx. 32 bits.
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

10.3.2 MODBUS RTU Response Format

■
Response in normal status
● The same message as a command is returned for a single write command or for a loop back
test.
● A part of a command message (6 bytes from the beginning) is returned for multiple write
command.
10-8
ADDRESS FUNCTION
8 bits 8 bits
8 bits, 0 to 247 (decimal)
Note) 0 = Broadcast address
8 bits
Varies depending on commands.
16 bits
3.5-character time (Varies by baud rate. Refer to reception judgment time.)
DATA CRC CHECK
n*8 bits 16 bits
END
3.5-Character
time
WUME-FPXHCOMG-02