TOHO ELECTRONICS TTM200 - Manual (Page 24)

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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 “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” ③
Data composition is ①, ②, ③,
and ④H. (① represents 1
byte.) Low level “0” , “0” ④
First register data
(a high-level word)
High level “0” , “0” ①
Low level “0” , “0” ②
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