AppendixA:Modbusprotocol
User’sManual 41
7.1 Modbus communication protocol
Modbus is enabled via RS232 and RS485 or USB. The response is the same type as the request.
Two versions of MODBUS register tables are available:
−
VERSION 1: Compatibility with advanced family of transducers (MT500)
−
VERSION 2: Compatibility with previous family of transducers (MI400)
Modbus
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.
VERSION1:
Register table for the actual measurements
Parameter
MODBUS
Register
Type
Start End
Reserved 30101 30104
Frequency 30105 30106 T5
U1 30107 30108 T5
U2 30109 30110 T5
U3 30111 30112 T5
Uavg (phase to neutral) 30113 30114 T5
ϕ 12 (angle between U1 and U2)
30115 T17
ϕ 23 (angle between U2 and U3)
30116 T17
ϕ 31 (angle between U3 and U1)
30117 T17
U12 30118 30119 T5
U23 30120 30121 T5
U31 30122 30123 T5
Uavg (phase to phase) 30124 30125 T5
I1 30126 30127 T5
I2 30128 30129 T5
I3 30130 30131 T5
INc 30132 30133 T5
INm - reserved 30134 30135 T5
Iavg 30136 30137 T5
Σ I
30138 30139 T5
Active Power Total (Pt) 30140 30141 T6
Active Power Phase L1 (P1) 30142 30143 T6
Active Power Phase L2 (P2) 30144 30145 T6
Active Power Phase L3 (P3) 30146 30147 T6
To Next Page
Loading...
