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Contrel EMC series Modbus register map

Also covers EMM-µD3h-485

Multifunction electrical meter

  • Verified
  • 86 registers
  • Modbus RTU
  • Revision 3 · 2026-11-10

Verified: Tested on a real device.

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Communication

Protocol
Modbus RTU
Unit ID
1default
Serial
9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit defaults
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
0-based
Max read
32 registers per request

Connection values are defaults: the device may be configured differently.

Map

Registers
86 holding registers
Groups
6
Translation tables
3
Revision
3 · 2026-11-10
Added
()
File
maps/contrel/emc.mbmap.json · 18 KB · history
SHA-256
29587a5e4ee4b15d813a90bdb6919dd70cd690d5858a47d4d8aab242bcf1b07d
Manufacturer
contrel.it

Sources and notes

  • EMC series electrical multifunction meter communication protocol · version IM154-U v0.94
    register tables, pages 8-11

Source: Contrel EMC series communication protocol, instruction manual IM154-U v0.94

  • Every value is a 32-bit integer in two registers, high word first.
  • A value the meter cannot measure reads 0.
  • The meter answers at most 32 registers (16 values) per read; a read must not split a value.
  • Energy T1 is the total or time band 1 counter and T2 the partial or time band 2 counter, depending on the energy mode. Meters without these functions only have T1.
  • The model and firmware are reported by Report Slave ID (FC17), not by a register: slave ID 0x50, firmware in data bytes 19-20, options in bytes 17-18.
  • The manual does not give the scale of the power factor and cos phi registers. On a device they read as thousandths (574 = 0.574, equal to active / apparent power), so the map scales them by 0.001.
  • Tested on an EMM-µD3h-485 (EMM-µD3), read over a Modbus TCP gateway, November 2026: all 80 registers read without errors. Checked: voltages, currents, power, energy (T1, T2 empty), frequency, status, settings and the 32-bit word order (big). The Max voltage L1-L3 registers (0x1072-0x1076) read 105145, 1009514 and 675279 with 226 V on the line, so they do not fit any scale and were not verified. Temperature, hour counter and neutral current read 0 on this meter.
AreaAddressNameTypeAccessUnitScaleDescription
HR 4096 uint32 ABCD R V Three-phase system voltage
HR 4098 uint32 ABCD R V
HR 4100 uint32 ABCD R V
HR 4102 uint32 ABCD R V
HR 4104 uint32 ABCD R V
HR 4106 uint32 ABCD R V
HR 4108 uint32 ABCD R V
HR 4110 uint32 ABCD R A ×0.001 Three-phase system current (sent in mA)
HR 4112 uint32 ABCD R A ×0.001 Sent in mA
HR 4114 uint32 ABCD R A ×0.001 Sent in mA
HR 4116 uint32 ABCD R A ×0.001 Sent in mA
HR 4118 int32 ABCD R ×0.001 Raw value divided by 1000 (574 = 0.574); the manual does not give the scale, checked against active / apparent power on a device
HR 4120 int32 ABCD R ×0.001 Raw value divided by 1000 (574 = 0.574); the manual does not give the scale, checked against active / apparent power on a device
HR 4122 int32 ABCD R ×0.001 Raw value divided by 1000 (574 = 0.574); the manual does not give the scale, checked against active / apparent power on a device
HR 4124 int32 ABCD R ×0.001 Raw value divided by 1000 (574 = 0.574); the manual does not give the scale, checked against active / apparent power on a device
HR 4126 int32 ABCD R ×0.001 Raw value divided by 1000 (574 = 0.574); the manual does not give the scale, checked against active / apparent power on a device
HR 4128 int32 ABCD R ×0.001 Raw value divided by 1000 (574 = 0.574); the manual does not give the scale, checked against active / apparent power on a device
HR 4130 int32 ABCD R ×0.001 Raw value divided by 1000 (574 = 0.574); the manual does not give the scale, checked against active / apparent power on a device
HR 4132 int32 ABCD R ×0.001 Raw value divided by 1000 (574 = 0.574); the manual does not give the scale, checked against active / apparent power on a device
HR 4134 uint32 ABCD R VA
HR 4136 uint32 ABCD R VA
HR 4138 uint32 ABCD R VA
HR 4140 uint32 ABCD R VA
HR 4142 uint32 ABCD R W
HR 4144 uint32 ABCD R W
HR 4146 uint32 ABCD R W
HR 4148 uint32 ABCD R W
HR 4150 uint32 ABCD R var
HR 4152 uint32 ABCD R var
HR 4154 uint32 ABCD R var
HR 4156 uint32 ABCD R var
HR 4158 uint32 ABCD R kWh ×0.1 Three-phase, in units of 100 Wh
HR 4160 uint32 ABCD R kvarh ×0.1 Three-phase, in units of 100 varh
HR 4162 uint32 ABCD R kWh ×0.1 Three-phase, in units of 100 Wh
HR 4164 uint32 ABCD R kvarh ×0.1 Three-phase, in units of 100 varh
HR 4166 uint32 ABCD R Hz ×0.001 Sent in mHz
HR 4168 uint32 ABCD R A ×0.001 Sent in mA
HR 4170 uint32 ABCD R kVAh ×0.1 Three-phase, in units of 100 VAh
HR 4172 uint32 ABCD R kVAh ×0.1 Three-phase, in units of 100 VAh
HR 4192 uint32 ABCD R A ×0.001 Maximum instantaneous value
HR 4194 uint32 ABCD R A ×0.001 Maximum instantaneous value
HR 4196 uint32 ABCD R A ×0.001 Maximum instantaneous value
HR 4198 uint32 ABCD R W Maximum instantaneous value
HR 4200 uint32 ABCD R VA Maximum instantaneous value
HR 4202 uint32 ABCD R A ×0.001 Highest average value
HR 4204 uint32 ABCD R A ×0.001 Highest average value
HR 4206 uint32 ABCD R A ×0.001 Highest average value
HR 4208 uint32 ABCD R W Highest average value
HR 4210 uint32 ABCD R V Maximum instantaneous value
HR 4212 uint32 ABCD R V Maximum instantaneous value
HR 4214 uint32 ABCD R V Maximum instantaneous value
HR 4216 uint32 ABCD R var Maximum instantaneous value
HR 4218 uint32 ABCD R var Highest average value
HR 4220 uint32 ABCD R VA Highest average value
HR 4222 uint32 ABCD R W
HR 4224 uint32 ABCD R var
HR 4226 uint32 ABCD R VA
HR 4228 uint32 ABCD R A ×0.001 Maximum instantaneous value
HR 4230 uint32 ABCD R A ×0.001 Highest average value
HR 4232 uint32 ABCD R A ×0.001
HR 4234 uint32 ABCD R A ×0.001
HR 4236 uint32 ABCD R A ×0.001
HR 4238 uint32 ABCD R A ×0.001
HR 4246 uint32 ABCD R °C
HR 4248 uint32 ABCD R h ×0.1 Sent in tenths of an hour
HR 4250 uint16 bits 8–15 R High byte of the DO1 settings
HR 4250 uint16 bits 0–7 R Low byte of the DO1 settings: index of the measure in table A (three-phase alarm) or table B (max/min alarm) of the manual
HR 4251 uint16 bits 8–15 R High byte of the DO2 settings
HR 4251 uint16 bits 0–7 R Low byte of the DO2 settings: index of the measure in table A (three-phase alarm) or table B (max/min alarm) of the manual
HR 4252 uint16 bits 8–15 R
HR 4252 uint16 bits 0–7 R
HR 4253 uint16 bits 0–7 R
HR 4254 uint16 bits 8–15 R
HR 4254 uint16 bits 0–7 R
HR 4255 uint16 bits 8–15 R
HR 4255 uint16 bits 0–7 R
HR 4512 uint32 ABCD RW Current transformer ratio for L1-L2-L3
HR 4514 uint32 ABCD RW ×0.1 Voltage transformer ratio
HR 4516 uint32 ABCD RW
HR 4518 uint32 ABCD RW Current transformer ratio for the neutral
HR 4520 uint32 ABCD W Output state in the high word, enable code 0x55AA in the low word. Only when DO1 is set to remote control
HR 4522 uint32 ABCD W Output state in the high word, enable code 0x55AA in the low word. Only when DO2 is set to remote control
HR 4528 uint32 ABCD W Write 0x11B055AA
HR 4530 uint32 ABCD W Write 0x11B255AA
HR 4532 uint32 ABCD W Write 0x11B455AA
HR 4534 uint32 ABCD W Write 0x11B655AA: max values and counters

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