Algodue Elettronica UEM80-4D R

Compatibility

Compatible with EpiSensor Edge over Modbus RTU

Algodue documents Modbus RTU and ASCII on the UEM80-4D R's built-in RS-485 port and publishes a register table with addresses, lengths, units and signs for read functions 03 and 04. This is documented compatibility, without a physical Edge test.

Algodue UEM80-4D R only (order codes 1104.0001.0001 to 1104.0004.0001), read with Algodue's MODBUS protocol manual v011 (August 2021) and the UEC80/UEM80 manual Ed2104. Check the register set and the signed-value mode before adding power and energy points. The UEM80-D M (M-Bus) and UEM80-4D E (Ethernet) are not covered. Read-only monitoring: no writes to the address, speed, register-set or counter registers.

Connect it with

• Modbus Interface ZMB-3X From €399 ex VAT Configure
• Gateway ZGW-20 From €899 ex VAT Configure

Models

Specifications

The UEM80-4D R suits a tenant feeder, sub-board or machine supply up to 80 A where a direct-connected, MID-capable meter with a serial port is wanted rather than CTs. The RS-485 version is for three-phase four-wire supplies only; the three-wire wirings in the manual belong to the pulse and M-Bus models.^2, 3

Order codes

1104.0001.0001 MID, 1104.0002.0001 MID S (Switzerland, no reactive counters on the display), 1104.0003.0001 without MID, 1104.0004.0001 without MID with reset of all counters.^3, 5

Current

Direct connection: Ist 20 mA, Imin 250 mA, Itr 500 mA, Iref 5 A, Imax 80 A.^2, 3, 4

Voltage and supply

3×230/400 to 3×240/415 V ±20%, 50/60 Hz; powered from the voltage circuit, at most 3.5 VA and 1 W per phase for the RS-485 model.^2, 3

Accuracy

Active energy class B to EN 50470-3 (MID packages) or class 1 to IEC/EN 62053-21 (without MID); reactive energy class 2 to IEC/EN 62053-23.^2, 3

MID approval

EU type-examination certificate 226/MID from IMQ (notified body 0051) for the UEM80-4D R and UEM80-4D E: current issue 20 May 2025, expiry 20 May 2035, software version 2.00.⁴

RS-485

Isolated port on COM, − and +, unit load 1/8; Modbus RTU or ASCII at 300 to 57600 bit/s. Factory setting Modbus RTU, 8N1, 19200 bit/s, address 01; addresses 01 to F7h (1 to 247).^1, 2

Inputs and outputs

One passive optoisolated S0 output, 27 VDC and 27 mA, 100 imp per kWh, kvarh or kVAh; active optoisolated tariff input, 80 to 276 VAC/DC selects tariff 2; metrological LED 1000 imp/kWh.^2, 3

Terminals

Measuring terminals 1.5 to 35 mm² at 2 Nm; S0, tariff and port terminals 0.14 to 2.5 mm² at 0.5 Nm.²

Housing

Four DIN modules to DIN 43880, 72 × 90 × 64 mm. IP51 front when installed in an IP51 enclosure, IP20 terminals.^2, 3

Environment

Operating −25 to +55 °C, storage −25 to +75 °C, humidity up to 80% without condensation; mechanical class M1, electromagnetic class E2.²

Interface

Documented measurements and integration boundaries for UEM80-4D R.

• Addresses below are the hexadecimal register addresses in Algodue's table. Send them as printed: the manual's own read example asks for 0002h with address bytes 00 02. Use FC03 or FC04 and read only consecutive registers, at most 127 per RTU request.
• The meter answers in one of two integer register sets: RegSet 0 (even and odd addresses) or RegSet 1 (even addresses only). Voltages and currents share addresses in both; power factor, power, frequency and energy do not. The set in use is reported at 0523h (RegSet 0, one register) or 0538h (RegSet 1, two registers): 0 = RegSet 0, 1 = RegSet 1.
• Phase voltages U1N, U2N and U3N at 0000h, 0002h and 0004h; line voltages at 0006h, 0008h and 000Ah; system voltage at 000Ch: two registers, mV, the same in both sets.
• Phase currents at 000Eh, 0010h and 0012h, neutral current at 0014h and system current at 0016h: two registers, mA, signed, the same in both sets.
• Power factor PF1 to PF3 and PFΣ: one register at 0018h to 001Bh in RegSet 0, two registers at 0018h, 001Ah, 001Ch and 001Eh in RegSet 1; multiply by 0.001, signed.
• Active power P1, P2, P3 and PΣ: three registers at 001Ch, 001Fh, 0022h and 0025h in RegSet 0, four registers at 0020h, 0024h, 0028h and 002Ch in RegSet 1; mW, signed. System apparent power is at 0031h or 003Ch (mVA) and system reactive power at 003Dh or 004Ch (mvar).
• Frequency at 0040h (one register, RegSet 0) or 0050h (two registers, RegSet 1), in mHz. Phase sequence at 0041h or 0052h: 0 = 123-CCW, 1 = 321-CW, 2 = not defined.
• System imported active energy +kWhΣ at 0109h (three registers, RegSet 0) or 010Ch (four registers, RegSet 1) and exported −kWhΣ at 0115h or 011Ch, unsigned, in 0.1 Wh. Per-phase, apparent and reactive totals start at 0100h; tariff 1 and tariff 2 counters start at 0200h and 0300h, partial counters at 0400h.
• The same measurements are repeated as IEEE-754 floats from 1000h, two registers each, in V, A, W and Wh: U1N at 1000h, PΣ at 1026h, frequency at 1038h and +kWhΣ at 1106h. The manual does not state the word order of the float block, so confirm it against the display before using it.
• Signed values follow the mode at 051Dh (RegSet 0) or 052Eh (RegSet 1): 0 = sign bit, where the top bit is the sign and the rest is the magnitude (8020h = −32), 1 = two's complement.
• Identity and status: serial number at 0500h (ten ASCII characters), counter model at 0505h or 0506h (08h = 80 A three-phase four-wire), counter type at 0506h or 0508h (02h = MID), firmware release at 0507h or 050Ah and error bits at 050Dh or 0514h (bit 0 phase sequence, bit 1 memory).

Setup

1. Confirm it is a UEM80-4D R

   The front label reads UEM80-4D (UEM80-4DS for the Swiss MID S package) and the RS-485 terminals are marked COM, − and +; the Ethernet version has a network socket instead. A MID meter shows the MID symbols and certificate number on the front, a meter without MID shows Cl.1 EN 62053-21. The info pages show the firmware releases and the communication type.

2. Check the wiring

   The RS-485 model supports three phases, four wires and three currents only. Check the phase-sequence symbol on the display before collecting readings; bit 0 of the error register at 050Dh (RegSet 0) or 0514h (RegSet 1) also flags a phase-sequence error.

3. Match the Setup 1 serial settings

   Hold ENTER for more than 3 s on the SEtUP? page to open Setup 1, then read the Addr (01 to F7h), bAud (300 to 57600 bit/s) and COM (RTU = 8N1, ASCII = 7E2) pages. Enter the same address, speed and RTU mode in Edge, and give every meter on the bus its own address. The factory setting is Modbus RTU, 8N1, 19200 bit/s, address 01.

4. Wire the RS-485 line

   Connect COM, − and + as a single daisy chain and fit a 120 to 150 Ω terminating resistor at the converter end and at the last meter. Algodue recommends at most 1200 m at 9600 bit/s; its wiring diagram groups up to 32 meters per segment and joins segments with repeaters.

5. Read the register set and sign mode

   Before adding power and energy points, read the register set (0523h in RegSet 0, 0538h in RegSet 1) and the signed-value mode (051Dh or 052Eh). Use the addresses and lengths of that set, and decode currents, power factors and powers with that sign mode.

6. Start with the L2 voltage read

   Read U2N with the example below and compare it with the L2 voltage on the display. Then add currents, powers and the energy counters, checking each new point against the matching display page.

Common questions

Do I send 0002h or 40003 for the L2 voltage?

Algodue's table gives hexadecimal register addresses that go on the wire as printed: its own read example asks for 0002h with address bytes 00 02. A client that takes the zero-based address enters 2; one that numbers holding registers from one enters 3, or 40003 in the five-digit style.¹

Why does energy read from the wrong address on some meters?

The protocol manual has two integer register sets. RegSet 0 packs values into consecutive addresses, so the system imported active energy is three registers at 0109h; RegSet 1 starts every value on an even address, so the same counter is four registers at 010Ch. Read the set in use at 0523h or 0538h and use that column. Changing the set is a write, which this read-only guide does not cover.¹

Why does a negative power look like a huge positive number?

Currents, power factors and powers are signed, and the meter reports how at 051Dh or 052Eh. In sign-bit mode the top bit is the sign and the rest is the magnitude, so 8020h means −32, not the two's-complement value. Decode with the mode the meter reports and check the sign against the import and export arrows on the display.^1, 2

How are the energy counters decoded?

Each counter is an unsigned integer in 0.1 Wh (0.1 varh or 0.1 VAh for the reactive and apparent rows): three registers in RegSet 0 and four in RegSet 1. Decode the most significant word first, as Algodue's two-register example does, then divide by 10 000 for kWh and compare with the total energy page on the display. The float copy at 1106h is in Wh.¹