APPENDIX B: MODBUS MAPPING FOR EPM 2200 MODBUS REGISTER MAP
EPM 2200 POWER METER – INSTRUCTION MANUAL B–3
The Mantissa is 11000010001110110111001 binary.
With the implied leading 1, the Mantissa is (1).C23B72 (hex).
The Floating Point Representation is therefore -1.75871956 x 2
10
Decimal equivalent: -1800.929
Note
Exponent = the whole number before the decimal point
Mantissa = the positive fraction after the decimal point
B.5 Modbus Register Map
Table B–1: Modbus Register Map (Sheet 1 of 7)
Hex Decimal
Description
1
Format
Range
6
Units or
Resolution
Comments #
R
e
g
Fixed Data Section
Identification Block
read-only
0000 - 0007 1 - 8 Meter Name ASCII 16 char none 8
0008 - 000F 9 - 16 Meter Serial Number ASCII 16 char none 8
0010 - 0010 17 - 17 Meter Type UINT16 bit-mapped -------t -----vvv t = 0
vvv = Software Option A1,
B1, or C1
1
0011 - 0012 18 - 19 Firmware Version ASCII 4 char none 2
0013 - 0013 20 - 20 Map Version UINT16 0 to 65535 none 1
0014 - 0014 21 - 21 Meter Configuration UINT16 bit-mapped -------- --ffffff ffffff = calibration
frequency (50 or 60)
1
0015 - 0015 22 - 22 ASIC Version UINT16 0-65535 none 1
0016 - 0026 23 - 39 Reserved 17
0027 - 002E 40 - 47 OEM Part Number 8
Block Size: 47
Meter Data Section
2
Primary Readings Block, 6 cycles (IEEE Floating
read-only
0383 - 0384 900 - 901 Watts, 3-Ph total FLOAT -9999 M to +9999 M watts 2
0385 - 0386 902 - 903 VARs, 3-Ph total FLOAT -9999 M to +9999 M VARs 2
0387 - 0388 904 - 905 VAs, 3-Ph total FLOAT -9999 M to +9999 M VAs 2
Block Size: 6
Primary Readings Block, 60 cycles (IEEE Floating Point) read-only
03E7 - 03E8 1000 - 1001 Volts A-N FLOAT 0 to 9999 M volts 2
03E9 - 03EA 1002 - 1003 Volts B-N FLOAT 0 to 9999 M volts 2
03EB - 03EC 1004 - 1005 Volts C-N FLOAT 0 to 9999 M volts 2
03ED - 03EE 1006 - 1007 Volts A-B FLOAT 0 to 9999 M volts 2
03EF - 03F0 1008 - 1009 Volts B-C FLOAT 0 to 9999 M volts 2
03F1 - 03F2 1010 - 1011 Volts C-A FLOAT 0 to 9999 M volts 2
03F3 - 03F4 1012 - 1013 Amps A FLOAT 0 to 9999 M amps 2
03F5 - 03F6 1014 - 1015 Amps B FLOAT 0 to 9999 M amps 2
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