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2.
RS 485 output data calculation method
Rx is parameter value returned by register; Umax represents rated voltage value; Imax represents rated
current value.
3 –phase 3-wire calculation
Parameter Name
Calculation Method
Data Format
Parameter Content
Line Voltage
Rx×Umax/
3
×0.0001
Unsigned Integer
Uca,Ubc,Uab
Current
Rx×Imax×0.0001
Unsigned Integer
Ia,Ic
Power Factor
Rx×0.0001
Signed Integer
COSφ
Total Active Power
Rx×Umax×Imax×
3
×0.0001
Signed Integer
Psum
Total Reactive
Power
Rx×Umax×Imax×
3
×0.0001
Signed Integer
Qsum
Total Apparent
Power
Rx×Umax×Imax×
3
×0.0001
Unsigned Integer
Ssum
3-phase 4-wire calculation
Parameter Name
Calculation Method
Data Format
Parameter Content
Phase Voltage Rx×Umax×0.0001
Unsigned Integer
Ua,Ub,Uc,
Line Voltage Rx×Umax/
3
×0.0001
Unsigned Integer
Uca,Ubc,Uab
Current
Rx×Imax×0.0001
Unsigned Integer
Ia,Ib,Ic
Power Factor Rx×0.0001
Signed Integer
COSφ，COSφ
a，
COSφ
b，
COSφ
c
Active Power Rx×Umax×Imax× 0.0001
Signed Integer
Pa,Pb,Pc
Reactive Power Rx×Umax×Imax× 0.0001
Signed Integer
Qa,Qb,Qc
Apparent Power
Rx×Umax×Imax
×0.0001
Unsigned Integer
Sa,Sb,Sc
Total Active
Power
Rx×Umax×Imax× 3×0.0001
Signed Integer
Psum
Total Reactive
Power
Rx×Umax×Imax× 3×0.0001
Signed Integer
Qsum
Total Apparent
Power
Rx×Umax×Imax
×3×0.0001
Unsigned Integer
Ssum
3.
Analogue Output Data Calculation
3-phase 3-wire
Output Parameter Output
Specification
Actual Output Value Calculation Formula
U
z ( Rated Output Line Voltage :V )
Iz (Rated Output Current :
mA)
0V～5V
Psum
=(
Uz-0)/5×(Ux×Ix×
3
)
1V～5V
Psum
=(
Uz-1)/4×(Ux×Ix×
3
)
2.5V±2.5V
Psum
=(
Uz-2.5)/2.5×(Ux×Ix×
3
)
3V±2V
Psum
=(
Uz-3)/2×(Ux×Ix×
3
)
Psum
0mA～20mA
Psum
=(
Iz-0)/20×(Ux×Ix×
3
)
Psum
=(
Iz-4)/16×(Ux×Ix×
3
4mA～20mA
)
Psum
=(
Iz-10)/10×(Ux×Ix×
3
10mA±10mA
)
Psum
=(
Iz-12)/8×(Ux×Ix×
3
12mA±8mA
)
0V～5V
Qsum
=(
Uz-0)/5×(Ux×Ix×
3
)
Qsum
=(
Uz-1)/4×(Ux×Ix×
3
1V～5V
)
Mianyang Weibo Electronics Co.,Ltd
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