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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
Summary of Contents for ELC-PB
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