Eastron SDM72D-M User Manual V1.1
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Input Registers
PART 3
Modbus Protocol
Input registers are used to indicate the present values of the measured and calculated electrical quantities. Each
parameter is held in two consecutive 16 big register. The following table details the 3X register address, and the
values of the the address bytes within the message. A (*) in the column indicated the parameter is valid for the
particular wiring system, Any parameter with a cross (X) will return the value zero. Each parameter is held in the 3X
registers. Modbus Protocol function code
04
is used to access all parameters.
For example, to request: Amps 1 Start address = 0006
No.of registers = 0002
Amps 2 Start address = 0008
No. Of register = 0002
Each request for data must be restricted to 30 parameters or less. Exceeding the 30 parameter limit will cause a
Modbus Protocol exception code to be returned.
Address
(Registe
r)
Input Register Parameter
Modbus
Protocol
Start
Address
Hex
Description
Length
(bytes)
Data
Format
Units
Hi
Byte
Lo
Byte
30001
Phase 1 line to neutral volts.
4
Float
V
00
00
30003
Phase 2 line to neutral volts.
4
Float
V
00
02
30005
Phase 3 line to neutral volts.
4
Float
V
00
04
30007
Phase 1 current.
4
Float
A
00
06
30009
Phase 2 current.
4
Float
A
00
08
30011
Phase 3 current.
4
Float
A
00
0A
30013
Phase 1 active power.
4
Float
W
00
0C
30015
Phase 2 active power.
4
Float
W
00
0E
30017
Phase 3 active power.
4
Float
W
00
10
30019
Phase 1
apparent power.
4
Float
VA
00
12
30021
Phase 2
apparent power.
4
Float
VA
00
14
30023
Phase 3
apparent power.
4
Float
VA
00
16
30025
Phase 1
reactive power.
4
Float
VAr
00
18
30027
Phase 2
reactive power.
4
Float
VAr
00
1A
30029
Phase 3
reactive power.
4
Float
VAr
00
1C
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•
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