TOHO ELECTRONICS TTM-00BT User Manual

Page 21

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21

7.9.6 Composition of a response message (transmitted from this product to a

high-level computer)

n For codes ① to ⑪, see "7.9.9 Code description."
n For specific examples of request messages, see "7.9.11 Examples of communications to be

read" and "7.9.12 Examples of communications to be written."

1) Response message in response to a read request message

S
T
X

□ □

A
C
K

□ □ □ □ □ □ □ □

E
T
X

B
C
C

① ② ③ ⑨

―⑤―

―――⑥―――

⑦ ⑧

Start code

Unit number

Channel

Acknowledge code

Identifier

Numerical data

End code

BCC data


2) Response message in response to a write/store request message

S
T
X

□ □

A
C
K

E
T
X

B
C
C

① ② ③ ⑨ ⑦ ⑧

Start code

Unit number

Channel

Acknowledge code

End code

BCC data


3) Response message in the case of an error

S
T
X

□ □

N
A
K

E
T
X

B
C
C

① ② ③ ⑩ ⑪ ⑦ ⑧

Start code

Unit number

Channel

Error code

ERR type

End code

BCC data

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