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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Страница 10: ...Table of Contents viii Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 21: ...2 Names and Functions of Parts Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 24: ...Names and Functions of Parts 2 4 Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 25: ...3 Wiring the COM Port Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 45: ...3 I O Allocation Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 52: ...I O Allocation 4 8 Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 57: ...6 PLC Link Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 97: ...9 General Purpose Communication Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 114: ...General Purpose Communication 9 18 Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 115: ...4 Troubleshooting Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
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Страница 125: ...11 Specifications Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...