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Hex
Decimal
9C4B - 9C4B 40012 - 40012 Frequency
9C4C - 9C4C 40013 - 40013 Volts A-B
9C4D - 9C4D 40014 - 40014 Volts B-C
9C4E - 9C4E 40015 - 40015 Volts C-A
9C4F - 9C4F 40016 - 40016 CT numerator
9C50 - 9C50 40017 - 40017 CT multiplier
9C51 - 9C51 40018 - 40018 CT denominator
9C52 - 9C52 40019 - 40019 PT numerator
9C53 - 9C53 40020 - 40020 PT multiplier
9C54 - 9C54 40021 - 40021 PT denominator
9C55 - 9C56 40022 - 40023 W-hours, Positive
9C57 - 9C58 40024 - 40025 W-hours, Negative
9C59 - 9C5A 40026 - 40027 VAR-hours, Positive
9C5B - 9C5C 40028 - 40029 VAR-hours, Negative
9C5D - 9C5E 40030 - 40031 VA-hours
9C5F - 9C5F 40032 - 40032 Neutral Current
9C60 - 9CA2 40033 - 40099 Reserved
9CA3 - 9CA3 40100 - 40100 Reset Energy
ASCII
SINT16/UINT16
SINT32/UINT32
FLOAT
1
2
3
4
5
EPM 2200 MULTI-FUNCTION POWER METERING SYSTEM – USER GUIDE
Table Appendix B –1: Modbus Register Map (Sheet 7 of 7)
1
Format
Description
UINT16 0 to 2730
UINT16 2047 to 4095
UINT16 2047 to 4095
UINT16 2047 to 4095
UINT16 1 to 9999
UINT16 1, 10, 100
UINT16 1 or 5
UINT16 1 to 9999
UINT16 1, 10, 100
UINT16 1 to 9999
UINT32 0 to 99999999
UINT32 0 to 99999999
UINT32 0 to 99999999
UINT32 0 to 99999999
UINT32 0 to 99999999
UINT16 0 to 4095
N/A
UINT16 password
Accumulators
ASCII characters packed 2 per register in high, low order and without any termination
characters. For example, "EPM2200" would be 4 registers containing 0x5378, 0x6172,
0x6B31, 0x3030.
16-bit signed / unsigned integer.
32-bit signed / unsigned integer spanning 2 registers. The lower-addressed register is the
high order half.
32-bit IEEE floating point number spanning 2 registers. The lower-addressed register is the
high order half (i.e., contains the exponent).
All registers not explicitly listed in the table read as 0. Writes to these registers will be
accepted but won't actually change the register (since it doesn't exist).
Meter Data Section items read as 0 until first readings are available or if the meter is not in
operating mode. Writes to these registers will be accepted but won't actually change the
register.
Register valid only in programmable settings update mode. In other modes these registers
read as 0 and return an illegal data address exception if a write is attempted..
Meter command registers always read as 0. They may be written only when the meter is in
a suitable mode. The registers return an illegal data address exception if a write is
attempted in an incorrect mode.
If the password is incorrect, a valid response is returned but the command is not executed.
Use 5555 for the password if passwords are disabled in the programmable settings.
APPENDIX B: MODBUS MAPPING FOR EPM2200
Units or
6
Range
Resolution
Hz
volts
volts
volts
none
none
none
none
none
none
Wh per energy
format
Wh per energy
format
VARh per energy
format
VARh per energy
format
VAh per energy
format
amps
N/A
none
5
#
R
Comments
e
g
0= 45 or less, 2047= 60,
1
2730= 65 or more
freq = 45 + ((register /
4095) * 30)
2047= 0, 4095= +300
1
volts = 300 * (register -
1
2047) / 2047
1
CT = numerator *
1
multiplier / denominator
1
1
PT = numerator * multiplier
1
/ denominator
1
1
* 5 to 8 digits
2
* decimal point implied,
2
per energy format
* resolution of digit before
2
decimal point = units, kilo,
or mega, per energy
2
format
* see note 10
2
see Amps A/B/C above
1
67
write-only register; always
1
reads as 0
Block Size:
100
APPENDIX B–11
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