Delta ASD-B2-0121-F, User Manual

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ASDA-B2-F Communications
September, 2015
8-7
8
RTU Mode:
Command Message (Master): Response Message (Slave):
Slave Address 01H Slave Address 01H
Function 03H Function 03H
Start Data Address
02H (High)
Data Number
(in byte)
04H
00H (Low)
Data Number
(in word)
00H
Content of Start Data
Address 0200H
00H (High)
02H B1H (Low)
CRC Check Low C5H (Low)
Content of Second Data
Address 0201H
1FH (High)
CRC Check High B3H (High) 40H (Low)
CRC Check Low A3H (Low)
CRC Check High D4H (High)
Note:
Before and after transmission in RTU mode, 10 ms of silent interval is needed.
Example 2: function code 06H, writing single word:
The master issues command to the 1
st
slave and writes data 0064H to address 0200H. The slave
sends response message to the master after writing is completed. The calculation of LRC and
CRC will be described in the following section.
ASCII Mode:
Command Message (Master):
Response Message (Slave):
Start ‘ : ’ Start ‘ : ’
Slave Address
‘0’
Slave Address
‘0’
‘1’ ‘1’
Function
‘0’
Function
‘0’
‘6’ ‘6’
Start Data Address
‘0’
Start Data Address
‘0’
‘2’ ‘2'
‘0’ ‘0’
‘0’ ‘0’
Data Content
‘0’
Data Content
‘0’
‘0’ ‘0’
‘6’ ‘6’
‘4’ ‘4’
LRC Check
‘9’
LRC Check
‘9’
‘3’ ‘3’
End 1 (0DH)(CR) End 1 (0DH)(CR)
End 0 (0AH)(LF) End 0 (0AH)(LF)