Delta ASD-A3-0121, Руководство пользователя

Страница: 476 / 603

ASDA-A3 MODBUS Communication
Revision December, 2017
9-9
9
Example 3: function code 10H, writing multiple words:
The master issues a command to the 1
st
slave and writes data 0BB8H and 0000H to the start
data address 0112H. In other words, 0BB8H is written into 0112H and 0000H is written into
0113H. The maximum allowable data in one single access is 8. The slave sends a response
message to the master after the writing is completed. The calculation of LRC and CRC is
described below.
ASCII mode:
Command Message (Master):
Response Message (Slave):
Start ‘ : ’ Start ‘ : ’
Slave Address
‘0’
Slave Address
‘0’
‘1’ ‘1’
Function
‘1’
Function
‘1’
‘0’ ‘0’
Start Data Address
‘0’
Start Data Address
‘0’
‘1’ ‘1'
‘1’ ‘1’
‘2’ ‘2’
Data Number
(In words)
‘0’
Data Number
‘0’
‘0’ ‘0’
‘0’ ‘0’
‘2’ ‘2’
Data Number
(In bytes)
‘0’
LRC Check
‘D’
‘4’ ‘A’
Content of the 1st Data
Frame
‘0’ End 1 (0DH) (CR)
‘B’ End 0 (0AH) (LF)
‘B’
‘8’
Content of the 2nd
Data Frame
‘0’
‘0’
‘0’
‘0’
LRC Check
‘1’
‘3’
End 1 (0DH) (CR)
End 0 (0AH) (LF)