Toho-electronics TTM200 Bedienungsanleitung Seite 24

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24
6.8 Composition of an ASCII request message (transmitted from a high-level
computer to this product)
For the codes a) through g), see "6.10 Description of ASCII codes."
6.8.1 Composition of a read request message
a)
Start code
:
b)
Slave address
0 , 1
c)
Function code
0 , 3
d)
Register address
High level
0 , 0
First register address
Low level
0 , 0
e)
Number of registers
High level
0 , 0
Fixed at 2
Low level
0 , 2
f)
LRC
F , A
g)
End code
CR, LF
6.8.2 Composition of a write request message
a)
Start code
:
b)
Slave address
0 , 1
c)
Function code
1 , 0
d)
Register address
High level
0 , 1
First register address
Low level
0 , 0
e)
Number of registers
High level
0 , 0
Fixed at 2
Low level
0 , 2
h)
Number of byte items
0 , 4
Register 2
i)
First register data
(a low-level word)
High level
0 , 0
Data composition is , , ,
and H. ( represents 1
byte.)
Low level
0 , 0
First register data
(a high-level word)
High level
0 , 0
Low level
0 , 0
f)
LRC
E , 8
g)
End code
CR, LF
6.8.3 Composition of a store request message
a)
Start code
:
b)
Slave address
0 , 1
c)
Function code
1 , 0
d)
Register address
High level
2 , 0
First register address
Low level
0 , E
e)
Number of registers
High level
0 , 0
Fixed at 2
Low level
0 , 2
h)
Number of byte items
0 , 4
Register 2
i)
First register data
(a low-level word)
High level
0 , 0
The data about the storage of settings
is arbitrary.
Low level
0 , 0
First register data
(a high-level word)
High level
0 , 0
Low level
0 , 0
f)
LRC
B , B
g)
End code
CR, LF
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