INST.No.INE-863B KR2S
【
Communication Interface
】
Instruction Manual
-2-
Table of Conte
Introduction ............................................................................................................................................................. 1
Table of Conte ........................................................................................................................................................ 2
1
For safe use ................................................................................................................ 4
1-1
Preconditions for use .................................................................................................................................... 4
1-2
Labels on this instrument .............................................................................................................................. 4
1-3
Symbols in this manual ................................................................................................................................. 4
2
General ........................................................................................................................ 5
2-1
RS-485 communications interface ................................................................................................................ 5
2-2
Ethernet ........................................................................................................................................................ 5
3
Communication protocol ............................................................................................. 6
3-1
MODBUS protocol ........................................................................................................................................ 6
4
Communications specifications.................................................................................. 7
4-1
Serial communications.................................................................................................................................. 7
4-2
Ethernet communications ............................................................................................................................. 7
4-2-1
Establishment of TCP connection ......................................................................................................................... 8
4-2-2
Data transmission and reception through TCP ...................................................................................................... 9
4-2-3
Disconnection of TCP connection ....................................................................................................................... 10
4-2-4
Functions at communications failure ................................................................................................................... 10
5
Confirmation of communications
specifications and settings ............................... 11
5-1
Confirmation of communications specifications .......................................................................................... 11
5-2
Settings from this unit ................................................................................................................................. 11
5-2-1
Settings for Ethernet............................................................................................................................................. 11
5-2-2
Settings for High order communications
.......................................................................................................... 12
6
Connections ............................................................................................................... 13
6-1
Connection precautions .............................................................................................................................. 13
6-1-1
Communications Terminals ................................................................................................................................. 13
6-1-2
Total extension of RS-485 communications cable is up to 1.2km. ....................................................................... 13
6-1-3
Take measures against noise .............................................................................................................................. 13
6-1-4
Crimp type terminals ........................................................................................................................................... 14
6-1-5
Attach a termination resistor ................................................................................................................................ 14
6-1-6
Number of this unit connectable .......................................................................................................................... 14
6-2
Communications cables ............................................................................................................................. 15
6-2-1
Communications cables for RS-485 .................................................................................................................... 15
6-2-2
Communications cables for Ethernet................................................................................................................... 16
6-3
Communication Line Wiring ........................................................................................................................ 17
6-3-1
Connections of High order communication RS-485............................................................................................. 17
6-3-2
Connections of low order communication RS-485 ............................................................................................... 18
6-3-3
Ethernet wiring .................................................................................................................................................... 19
7
MODBUS protocol ...................................................................................................... 20
7-1
Transmission mode of message ................................................................................................................. 21
7-1-1
Transmission data ............................................................................................................................................... 21
7-1-2
Message frame configuration
............................................................................................................................ 21
7-2
Data time interval ........................................................................................................................................ 22
7-3
Message configuration................................................................................................................................ 22
7-3-1
Slave address ..................................................................................................................................................... 22
7-3-2
Function code ..................................................................................................................................................... 22
7-3-3
Data part ............................................................................................................................................................. 23
7-3-4
Reference number .............................................................................................................................................. 24
7-3-5
Error check .......................................................................................................................................................... 26
7-3-6
Precautions at the time of data processing .......................................................................................................... 28
7-4
Message creation ....................................................................................................................................... 29
7-4-1
RTU mode message ........................................................................................................................................... 29
7-4-2
ASCII mode message ......................................................................................................................................... 30
7-5
Function Code ............................................................................................................................................ 31
7-5-1
Reading of digital setting values (Reading of coil status) ..................................................................................... 31
Содержание KR2S
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