Technical Documentation
BLR-CM Modbus
Rev. 05
2018-09
3
Content
1
OVERVIEW .......................................................................................................................................................... 4
2
MODBUS/ RS485 ................................................................................................................................................. 5
2.1
RS485 (defined in EIA485/ISO8482)................................................................................................................. 5
2.1.1
Connection ...................................................................................................................................................... 6
2.1.2
Line termination ............................................................................................................................................. 7
2.1.3
Line biasing ..................................................................................................................................................... 7
2.1.4
Communication indicator ............................................................................................................................... 7
2.2
The Modbus protocol ...................................................................................................................................... 8
2.2.1
Modbus - description ...................................................................................................................................... 8
2.2.2
Serial data format ........................................................................................................................................... 8
2.2.3
Serial transmission modes .............................................................................................................................. 9
2.2.4
Function codes ................................................................................................................................................ 9
2.2.5
Exception codes ............................................................................................................................................ 10
2.2.6
Master-Slave protocol .................................................................................................................................. 10
3
BLR-CM MODBUS ...............................................................................................................................................10
3.1
Setup ..............................................................................................................................................................10
3.2
Address space ................................................................................................................................................10
3.3
Measurement values ......................................................................................................................................11
3.4
Work counters ...............................................................................................................................................12
3.5
Parameter settings .........................................................................................................................................13
3.6
Stage status ....................................................................................................................................................17
3.7
Device status ..................................................................................................................................................18
3.8
Storage settings .............................................................................................................................................20
4
TROUBLE SHOOTING ..........................................................................................................................................21