Appendix A: Modbus Protocol; Modbus Communication Protocol; Modbus Protocol - Iskra MC320 User Manual

APPENDIX A: MODBUS PROTOCOL
APPENDIX A: MODBUS PROTOCOL
Modbus communication protocol
Modbus and DNP3 protocol are enabled via RS232 or RS485 or USB communication port. The response is the
same type as the request.
Modbus protocol
Modbus protocol enables operation of device on Modbus networks. For device with serial communication the
Modbus protocol enables point to point (for example Device to PC) communication via RS232 communication
and multi drop communication via RS485 communication. Modbus protocol is a widely supported open
interconnect originally designed by Modicon.
The memory reference for input and holding registers is 30000 and 40000 respectively.
At MODBUS register 40100 (MODBUS table for measurements) you can select register map. Value "0" is MC7X0
compatible register map. Value "1" is MI71X0 compatible register map.
Register table for the actual measurements
Parameter
Voltage U
1
Voltage U
2
Voltage U
3
~
Average phase Voltage U
Phase to phase voltage U
12
Phase to phase voltage U
23
Phase to phase voltage U
31
Avg. phase to phase Voltage U
Current I
1
Current I
2
Current I
3
Total Current I
Neutral current In
Real Power P
1
Real Power P
2
Real Power P
3
Total Real Power P
Reactive Power Q
1
Reactive Power Q
2
Reactive Power Q
3
Total Reactive Power Q
Apparent Power S
1
Apparent Power S
2
Apparent Power S
3
Total Apparent Power S
Measuring centres – MC320, MC330, MC350 & MC350H ‐ User's Manual
MC7x0 RM Comp. MI71x0 RM Comp.
Type
Start
T5 30107
T5 30109
T5 30111
T5 30113
T5 30118
T5 30120
T5 30122
~
T5 30124
pp
T5 30126
T5 30128
T5 30130
T5 30138
T5 30132
T6 30142
T6 30144
T6 30146
T6 30140
T6 30150
T6 30152
T6 30154
T5 30148
T5 30158
T5 30160
T5 30162
T7 30156
End Start End
30108 30044 30045
30110 30046 30047
30112 30048 30049
30114 30042 30043
30119 30081 30082
30121 30083 30084
30123 30085 30086
30125 30079 30080
30127 30036 30037
30129 30038 30039
30131 30040 30041
30139 30034 30035
30133 30074 30075
30143 30020 30021
30145 30022 30023
30147 30024 30025
30141 30018 30019
30151 30028 30029
30153 30030 30031
30155 30032 30033
30149 30026 30027
30159 30052 30053
30161 30054 30055
30163 30056 30057
30157 30050 30051
53