Toho Electronics TTX-800, Руководство по эксплуатации

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3.4 Explanation of MODBUS ASCII Communication
3.4.1 Structure of MODBUS ASCII Request Message (Data Transmission from the Upper Computer to This Product)
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See “ 3.4.3Explanation of MODBUS ASCII Codes ” for codes a) to j).
3.4.1.1 Structure of Read Request Message
a) Start Code ‘ : ’
b) Slave Address ‘ 0 ’ , ’ 1 ’
c) Function Code ‘ 0 ’ , ’ 3 ’
d) Register Address
Upper ‘ 0 ’ , ’ 0 ’
First register address
Lower ‘ 0 ’ , ’ 0 ’
e) Number of Registers
Upper ‘ 0 ’ , ’ 0 ’ 2 (fixed)
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Except for communication monitor
register address
Lower ‘ 0 ’ , ’ 2 ’
f) LRC ‘ F ’ , ’ A ’
g) End Code CR,LF
3.4.1.2 Structure of Write Request Message
a) Start Code ‘ : ’
b) Slave Address ‘ 0 ’ , ’ 1 ’
c) Function Code ‘ 1 ’ , ’ 0 ’
d) Register Address
Upper ‘ 0 ’ , ’ 1 ’
First register address
Lower ‘ 0 ’ , ’ 0 ’
e) Number of Registers
Upper ‘ 0 ’ , ’ 0 ’
2 (fixed)
Lower ‘ 0 ’ , ’ 2 ’
h) Number of Bytes ‘ 0 ’ , ’ 4 ’ Number of Registers x 2
i)
Data for the First Register
(Lower Word) Upper ‘ 0 ’ , ’ 0 ’ ③
Data structure is ①②③④H.
(① represents 1 byte)
Lower ‘ 0 ’ , ’ 0 ’ ④
Data for the First Register
(Upper Word) Upper ‘ 0 ’ , ’ 0 ’ ①
Lower ‘ 0 ’ , ’ 0 ’ ②
f) LRC ‘ E ’ , ’ 8 ’
g) End Code CR,LF
3.4.1.3 Structure of Save Request Message
a) Start Code ‘ : ’
b) Slave Address ‘ 0 ’ , ’ 1 ’
c) Function Code ‘ 1 ’ , ’ 0 ’
d) Register Address
Upper ‘ 0 ’ , ’ 9 ’
First register address
Lower ‘ 0 ’ , ’ C ’
e) Number of Registers
Upper ‘ 0 ’ , ’ 0 ’
2 (fixed)
Lower ‘ 0 ’ , ’ 2 ’
h) Number of Bytes ‘ 0 ’ , ’ 4 ’ Number of Registers x 2
i)
Data for the First Register
(Lower Word)
Upper ‘ 0 ’ , ’ 0 ’
Data for saving the setting is optional.
Lower ‘ 0 ’ , ’ 0 ’
Data for the First Register
(Upper Word)
Upper ‘ 0 ’ , ’ 0 ’
Lower ‘ 0 ’ , ’ 0 ’
f) LRC ‘ B ’ , ’ B ’
g) End Code CR,LF