TOHO ELECTRONICS TTM000 - Manual (Page 29)

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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” , “B”
c) Function code “0” , “3”
h) Number of data items “0” , “4” Number of registers 2
i)
Data for the first register
(a low-level word)
High level “0” , “3” 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 “0” , “9” ④
Data for the first register + 1
(a high-level word)
High level “0” , “0” ①
Low level “0” , “0” ②
f) LRC “D” , “2”
g) End code CR, LF
6.9.2 Response message for a write/store 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 “0” , “0”
e) Number of registers
High level “0” , “0”
Fixed at 2
Low level “0” , “2”
f) LRC “E” , “B”
g) End code CR, LF
6.9.3 Response message in the case of an error
a) Start code “:”
b) Slave address “1” , “B”
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” , “2”
f) LRC “6” , “0”
g) End code CR, LF