Eaton ELC-PB - Appendix A - Communications; A.1 Communication Ports

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A
-1
Communications
This chapter contains information regarding the built-in communications ports of the ELC
processors.
This Chapter Contains
A.1 Communication Ports .........................................................................................................A-2
A.2 Configuration of the communication ports ...................................................................... A-3
Selecting master or slave operation. ......................................................................................A-3
Selecting transmission mode..................................................................................................A-3
Selecting data packet format. .................................................................................................A-3
A.3 Communication Protocol ASCII transmission mode....................................................... A-5
ADR (Modbus Address)..........................................................................................................A-5
CMD (Function code) and DATA (data characters) ................................................................A-5
LRC CHK (check sum) ...........................................................................................................A-7
A.4 Communication Protocol RTU transmission mode......................................................... A-8
Address (Modbus Address) ....................................................................................................A-8
CMD (Function code) and DATA ............................................................................................A-8
CRC CHK (check sum)...........................................................................................................A-9
A.5 ELC Modbus Address mapping....................................................................................... A-10
A.6 Function Code support (Slave Mode).............................................................................. A-14
Command Code：01, Read Coil Status of Contact (Input point X is not included) ............ A-14
Command Code：02, Read Input Status ............................................................................ A-15
Command Code：03, Read Content of Register (T, C, D) ................................................. A-16
Command Code：05, Force Single Coil ............................................................................. A-17
Command Code：06, Preset Single Register..................................................................... A-18
Command Code：15, Force Multiple Coils ......................................................................... A-19
Command Code：16, Preset Multiple Register .................................................................. A-20
Command Code：17, Report Slave ID ............................................................................... A-21
A.7 Function Code Support (Master mode)............................................................................. A-22