Toho-electronics TRM-006A Manual de usuario Pagina 21
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6.3 Composition of an RTU request message (transmitted from a high-level
computer to this product)
n For codes a) through i), see "6.5 Description of RTU codes."
6.3.1 Composition of a read request message
a)
Slave address 1BH
b)
Function code 03H
High level
00H
c)
Register address
Low level
00H
First register address
High level
00H
d)
Number of registers
Low level
02H
Fixed at 2
High level
C6H
e)
CRC-16
Low level
31H
6.3.2 Composition of a write request message
a)
Slave address 03H
b)
Function code 10H
High level
00H
c)
Register address
Low level
C0H
First register address
High level
00H
d)
Number of registers
Low level
02H
Fixed at 2
f)
Number of data items 04H Number of registers × 2
High level
00H ③
Data for the first register
(a low-level word)
Low level
6FH ④
High level
00H ①
g)
Data for the first register + 1
(a high-level word)
Low level
00H ②
When writing ①, ②, ③, and
④ H in the data, write them in
the order described on the
left-hand side. (① represents 1
byte.)
High level
C4H
e)
CRC-16
Low level
5AH
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