TOHO ELECTRONICS TTM200 - Manual (Page 25)

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6.9 Composition of ASCII response messages (transmitted from this product
to a high-level computer)
 For the codes a) through g), see "6.10 Description of ASCII codes."
6.9.1 Response message for a read request message
a) Start code “:”
b) Slave address “1” , “1”
c) Function code “0” , “3”
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 “5” , “3”
g) End code CR, LF
6.9.2 Response message for a write/store 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”
f) LRC “E” , “C”
g) End code CR, LF
6.9.3 Response message in the case of an error
a) Start code “:”
b) Slave address “0” , “1”
h) Function code “8” , “3” 
In the case of an error, the function
code for the request message +
80H is entered.
j) Error code “0” , “3”
f) LRC “7” , “9”
g) End code CR, LF