TOHO ELECTRONICS TTX-700 - Manual (Page 23)

Single
a) Slave address 03H
b) Function code 06H
High level 00H
c) Register address
Low level C0H
First register address
High level 00H
g)
Data for the first register
(a low-level word)
Low level 6FH
High level C4H
e) CRC-16
Low level 5AH
6.4.3 Response message in the case of an error
a) Slave address 1BH
b) Function code 83H
h) Error code 02H
High level E1H
e) CRC-16
Low level 36H
←
In the case of an error, the function
code for the request message +
80H is entered.
6.5 Description of RTU codes
n The codes from a) slave address to b) function code to h) error code shown below are expressed
in 8-bit binary numbers.
a) Slave address
This is the address of the party (this product) with which the high-level computer
communicates. The address in the response message from this product represents the source
of the response message. Note that, when CH2 is used, 2 addresses are occupied. (When the
ADR is set to 1, addresses 1 and 2 are occupied.)
b) Function code
Enter a code 03H, 06H, or 10H.
03H: To read data from this product
06H: To write or store data in this product (multiple)
10H: To write or store data in this product (single)
c) Register address
The locations of the data to be read or that to be written are specified in 2 bytes.
The data is written in the holding register.
For the addresses of the commands, see "10. Table of identifiers (codes)."
d) Number of registers
This specifies the number of registers to be written in. Since this product has a fixed number
of registers (which is 2), specify 0002H.
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