Siemens 7KT0310, Manual, Page: 15 / 21

15
SMART 7KT0310 Manual
Communication
7
Protocol and interface
Protocol: Modbus RTU
Interface: Integrated RS485 interface
Communication parameters
Communication address 1 to 255
Transmission mode Half duplex
Data types Float and Integer
Transmission distance 500m maximum
Transmission Speed 300, 600, 1200, 2400, 4800,
9600, 19200 (in bps)
Parity None, Odd, Even
Stop bits 1 or 2
Response Time 100ms Max & Independent, at
Baud rate
Connection diagram for communication
RS485-RS232
Converter
Master
Suggested
terminating resistor
(120 ohm, ¼ watt)
F2 F3 F4 F1 F2 F3 F4 F1 F2 F3 F4 F1
Contact sales for PC based monitoring software to
communicate with the meters.
Modbus register addresses list
Readable Parameters: [Length (Register): 2; Data Structure: Float]
Address Hex Address Parameter
30000 0x00 Voltage V1N
30002 0x02 Voltage V2N
30004 0x04 Voltage V3N
30006 0x06 Average Voltage LN
30008 0x08 Voltage V12
30010 0x0A Voltage V23
30012 0x0C Voltage V31
30014 0x0E Average Voltage LL
30016 0x10 Current I1
30018 0x12 Current I2
30020 0x14 Current I3
30022 0x16 Average Current
30024 0x18 kW1
30026 0x1A kW2
30028 0x1C kW3
30030 0x1E kVA1
30032 0x20 kVA2
30034 0x22 kVA3
30036 0x24 kVAr1
Address Hex Address Parameter
30038 0x26 kVAr2
30040 0x28 kVAr3
30042 0x2A Total KW
30044 0x2C Total KVA
30046 0x2E Total KVAr
30048 0x30 PF1
30050 0x32 PF2
30052 0x34 PF3
30054 0x36 Average PF
30056 0x38 Frequency
30058 0x3A Total net kWh
30060 0x3C Total net kVAh
30062 0x3E Total net kVArh
30064 0x40 kW Max Active Power
30066 0x42 kW Min Active Power
30068 0x44 kVAr Max Reactive Power
30070 0x46 kVAr Min Reactive Power
30072 0x48 kVA Max Apparent Power
30084 0x54 kWh1 (Imp)