INST.No.INE-863B KR2S【Communication Interface】Instruction Manual
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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