Chapter 9 Communications
Example 2:
Function code: 06H, write 1 word
For example, writing 100 (0064H) to starting data address 0200H. The slave will send the
response message to the master after writing operation is completed.
ASCII Mode:
Command message (Master): Response message (Slave):
Start ‘:’ Start ‘:’
‘0’ ‘0’
Slave Address
‘1’
Slave Address
‘1’
‘0’ ‘0’
Function
‘6’
Function
‘6’
‘0’
‘0’
‘2’ ‘2'
‘0’ ‘0’
Starting data
address
‘0’
Starting data
address
‘0’
‘0’ ‘0’
‘0’ ‘0’
‘6’
‘6’
Content of data
‘4’
Content of data
‘4’
‘9’ ‘9’
LRC Check
‘3’
LRC Check
‘3’
End 1 (0DH)(CR) End 1 (0DH)(CR)
End 0 (0AH)(LF)
End 0 (0AH)(LF)
RTU Mode:
Command message (Master): Response message (Slave):
Address 01H Address 01H
Slave Function 06H Slave Function 06H
02H (High)
02H (High)
Starting data
address
00H (Low)
Starting data
address
00H (Low)
00H (High) 00H (High)
Content of data
64H (Low)
Content of data
64H (Low)
CRC Check Low 89H (Low) CRC Check Low 89H (Low)
CRC Check High 99H (High)
CRC Check High
99H (High)
Please note:
In RTU mode, a silent interval of more than 10ms is needed before and after transmission.
9-10 Revision January 2011
Call 1(800)985-6929 for Sales
Call 1(800)985-6929 for Sales
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