EV/DV300 Series Power Meter
V:2.0 Revised October 2018
47
The relation between real value (Val_r) and communication value (Val_c)
Table 4.15 The relation between real value and communication value
Parameter
Relation
Unit
U1, U2, U3, Uavg U12 U23,
U31, Ulavg
Val_r= Val_cX (PT1 / PT2) /10
Volt
I1, I2, I3, Iavg, In
Val_r = Val_c X(CT1/5) /1000
Amp
P, Q, S
Val_r = Val_c X (PT1 / PT2) X (CT1/5)
Watt, Var, VA
PF
Val_r = Val_c / 1000
NA
F
Val_r = Val_c / 100
Hz
Load nature RT
ASCII L(4CH), C(43H), R(52H)
NA
Ep, Eq
Val_r = Val_c / 10
Kwh, Kvah
A (4~20mA)
Val_r = Val_c / 1000
mA
AO (0~1mA)
Val_r = Val_c / 10000
mA
AO (0~5V)
Val_r = Val_c / 1000
Volt
Meter parameter area
The meter parameters are stored in this area. The register is read by using of function code
03 and write in function code 16.
Table 4.16 parameter register address table
Address
Parameter
Access
Range
Type
0101H
Access code
R/W
0~9999
Word
0102H
Address
R/W
1~255
Word
0103H
Baud rate
R/W
1200, 2 400, 4800, 9600, 19200
Word
0104H
PT1 (Low)
R/W
100~500000
Dword
0105H
PT1 (High)
R/W
0106H
PT2
R/W
100~400
Word
0107H
CT1
R/W
5~9999
Word
0108H
CT2
R/W
5
Word
0109H
Relay output
mode
R/W
0-Latch, 1-Monmentary, 2-Alarm
Word
010AH
AO1 to parameter
assignment
R/W
0-U1
1-U2
2-U3
3-U12
4-U23
5-U31
6-I1
7-I2
8-I3
9-Uavg
10-Ulavg
11-Iavg
12-P
13-Q
14-S
15-F
16-PF
Word
010BH
AO2 to parameter
R/W
Same as AO1
Word
0130H
LCD Back Light
Time
R/W
0~120
Word
