TOHO ELECTRONICS TTM000 - Manual (Page 27)

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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 “1” , “B”
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 “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”
d) Register address
High level “0” , “0”
First register address
Low level “C” , “0”
e) Number of registers
High level “0” , “0”
Fixed at 2
Low level “0” , “2”
h) Number of data items “0” , “4” Number of registers 2
i)
Data for the first register
(a low-level word)
High level “0” , “0” ③ 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.)
Low level “6” , “F” ④
Data for the first register + 1
(a high-level word)
High level “0” , “0” ①
Low level “0” , “0” ②
f) LRC “E” , “0”
g) End code CR, LF