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9 Modbus RTU – integrated Modbus port specification
9.3 Modbus register map
56
The structure of the four-register format and the calculation of the energy
values are outlined below.
Energy register 0
15
14
13
12
11
Byte 1 of the mantissa
Energy register 1
15
14
13
12
11
Byte 3 of the mantissa
Energy register 2
15
14
13
12
11
Byte 5 of the mantissa
Energy register 3
15
14
13
12
11
a = technical unit
The energy value (four-register energy value) is calculated as follows:
PXR Electronic trip unit 01/21 MN012005EN www.eaton.com
10
9
8
7
10
9
8
7
10
9
8
7
10
9
8
7
a
Energy = 2
x 48-bit energy value x 10
6
5
4
3
2
Byte 0 of the mantissa
6
5
4
3
2
Byte 2 of the mantissa
6
5
4
3
2
Byte 4 of the mantissa
6
5
4
3
2
b = mantissa factor
b
1
0
1
0
1
0
1
0
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