Toho-electronics TRM-006A Uživatelský manuál Strana 27

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6.8 Composition of an ASCII request message (transmitted from a high-level
computer to this product)
n 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 1 , B
c)
Function code 0 , 3
High level
0 , 0
d)
Register address
Low level
0 , 0
First register address
High level
0 , 0
e)
Number of registers
Low level
0 , 2
Fixed at 2
f)
LRC E , 0
g)
End code CR, LF
6.8.2 Composition of a write request message
a)
Start code :
b)
Slave address 0 , 3
c)
Function code 1 , 0
High level
0 , 0
d)
Register address
Low level
C , 0
First register address
High level
0 , 0
e)
Number of registers
Low level
0 , 2
Fixed at 2
h)
Number of data items 0 , 4 Number of registers × 2
High level
0 , 0
Data for the first register
(a low-level word)
Low level
6 , F
High level
0 , 0
i)
Data for the first register + 1
(a high-level word)
Low level
0 , 0
When writing , , , and
H in the data, write them in
the order described on the
left-hand side. ( represents 1
byte.)
f)
LRC E , 0
g)
End code CR, LF
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