9 Modbus RTU – integrated Modbus port specification
9.3 Modbus register map
56 PXR Electronic trip unit 01/21 MN012005EN www.eaton.com
The structure of the four-register format and the calculation of the energy
values are outlined below.
Energy register 0
Energy register 1
Energy register 2
Energy register 3
The energy value (four-register energy value) is calculated as follows:
1514131211109876543210
Byte 1 of the mantissa Byte 0 of the mantissa
1514131211109876543210
Byte 3 of the mantissa Byte 2 of the mantissa
1514131211109876543210
Byte 5 of the mantissa Byte 4 of the mantissa
1514131211109876543210
a = technical unit b = mantissa factor
Energy = 2
a
x 48-bit energy value x 10
b
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