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Appendix A – Communications
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 (Command 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 Status of Contact (Input point X is not included) ..................... A-14
Command Code: 02, Read Status of Contact (Input point X is included) ........................... A-15
Command Code: 03, Read Content of Register (T, C, D) ................................................... A-16
Command Code: 05, Force ON/OFF single contact ........................................................... A-17
Command Code: 06, Set content of single register ............................................................ A-18
Command Code: 15, Force ON/OFF multiple contacts....................................................... A-19
Command Code: 16, Set content of multiple registers........................................................ A-20
Command Code: 17, Set content of multiple registers........................................................ A-21
A.7 Function Code Support (Master mode)...........................................................................A-22
Appendix B – Troubleshooting
B.1 Common Problems and Solutions..................................................................................... B-2
B.2 Fault code Table (Hex) ........................................................................................................B-5
B.3 Error Detection Devices......................................................................................................B-8
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