Socomec DIRIS A-10

Compatibility

Compatible with EpiSensor Edge over Modbus RTU

Socomec documents RS-485 Modbus RTU for reference 48250401 and publishes a register table with decimal and hexadecimal addresses, register counts, units and data types. This is documented compatibility, without a physical Edge test.

DIRIS A-10 with RS485 Modbus, reference 48250401, using communication table V202.81 (February 2025) as a best-effort starting map. The A-10 table names its blocks READ but prints no function code or word order, so the first read is a single-register frequency point compared with the display. Reference 48250400 has no communication port. Read-only monitoring.

Connect it with

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

Models

Specifications

Choose the A-10 for a single low-voltage feeder or board measured through CTs where a modular meter with a display and RS-485 is enough. Order 48250401 for communication; 48250400 is the display-only reference. Both carry the same IEC 61557-12 measurement, a two-tariff input and a pulse output.^2, 3

Exact references

DIRIS A-10 with RS485 Modbus: 4825 0401. DIRIS A-10 without communication: 4825 0400.^2, 3

Networks

Three-phase three or four wire, two-phase and single-phase, set as 1BL, 2BL, 3BL, 3NBL, 4BL or 4NBL in the programming menu. Balanced networks can use one CT; unbalanced three-wire networks can use two.^1, 2, 3

Current inputs

Through CTs with a 5 A secondary and a primary from 5 to 9999 A. Minimum measuring current 5 mA; permanent overload 6 A; input consumption below 0.6 VA.^2, 3

Voltage inputs

Direct connection, 50 to 520 V AC phase to phase and 50 to 300 V AC phase to neutral; 45 to 65 Hz. Fuse each voltage input with 0.5 A gG.^2, 3

Accuracy

Active energy class 0.5S to IEC 62053-22; reactive energy class 2 to IEC 62053-23. PMD to IEC 61557-12. Measurements update every second.^2, 3

Auxiliary supply

Separate supply on terminals 20 and 22: 110 to 277 V AC, 50/60 Hz in both documents; the catalogue also lists 120 to 300 V DC. Check the rating label on the installed meter.^2, 3

RS-485

Reference 48250401 only. Modbus RTU (JBUS) over two-wire half-duplex RS-485 on terminals 15 (+) and 17 (-). Address 1 to 255 in the menu; 2400 to 38400 bit/s; odd, even or no parity; one or two stop bits.^2, 3

Other interfaces

Pulse output on 4 (+) and 6 (-) to IEC 62053-31 class A and B, up to 30 V DC and 27 mA. Tariff input on 8 and 10: 0 V AC selects tariff 1 and an AC voltage selects tariff 2. Internal temperature sensor.^2, 3

Mounting

Four modules on a DIN rail, 72 x 90 x 64 mm in the catalogue; 4 mm² terminals for current and voltage and 2.5 mm² for the others; front IP52.^2, 3

Environment

Indoor use up to 2000 m; operating -10 to +55 °C, storage -20 to +70 °C. Immunity to IEC 61326-1 and emissions to CISPR 11 class B.^2, 3

Interface

Documented measurements and integration boundaries for DIRIS A-10.

• Addresses in the table are decimal PDU addresses with the hexadecimal beside them: 50520 is 0xC558 and goes on the wire as C5 58. Read every point with FC03 and do not mix blocks in one request.
• Frequency at 51287 (0xC857): one register, U16, hundredths of a hertz. The safest first read, because it needs no word order.
• Phase-to-phase voltage U12, U23, U31 at 50514, 50516 and 50518, and phase-to-neutral voltage V1, V2, V3 at 50520, 50522 and 50524: two registers each, U32, hundredths of a volt.
• Frequency as a 32-bit value at 50526: two registers, U32, hundredths of a hertz.
• Current I1, I2, I3 and neutral In at 50528, 50530, 50532 and 50534: two registers each, U32, milliamps, in the block Socomec marks as affected by the current transformers.
• Total active power at 50536 (S32, units of 10 W, signed for import and export), total reactive power at 50538 (S32, units of 10 var), total apparent power at 50540 (U32, units of 10 VA) and total power factor at 50542 (S32, divide by 1000; negative is leading, positive lagging).
• Active power per phase at 50544, 50546 and 50548: S32, units of 10 W. Reactive power per phase follows at 50550 to 50554 and apparent power at 50556 to 50560.
• Energy at 50780 positive active (Ea+), 50786 negative active (Ea-), 50782 positive reactive and 50788 negative reactive: two registers each, U32, kWh or kvarh in whole units. Socomec labels these counters partial.
• Tariff energy: current tariff number at 50849, then active energy for tariff 1 and tariff 2 at 50850 and 50852 (U32, kWh).
• Total harmonic distortion at 51536 to 51544 (U12 to U31, V1 to V3, I1 to I3): one register each, U16, tenths of a percent.
• Identity: 50000 holds "SOCO" in four registers, 50006 the table version, 50007 the software version and 50050 the product name in eight registers.
• Leave the setup table at 36352, the reset command at 1024 and the action register at 57856 out of the polling configuration. They accept writes with lock level NONE and change the CT ratio, zero counters or restore factory settings.

Setup

1. Identify the meter

   Read the reference on the side label. 48250401 has the RS-485 port and a communication activity indicator on the display; 48250400 has no port. Record the software version shown at the end of the programming menu.

2. Run the connection test first

   The TEST function reports Err 0 when the wiring is correct, Err 1 to Err 3 for a reversed CT and Err 4 to Err 6 for swapped voltages. It needs current and voltage on every phase and a power factor between 0.6 and 1. Clear any error before you collect power or energy.

3. Read the serial settings from the programming menu

   Enter the programming menu with the access code (100 in the instructions unless it has been changed) and note Adr, bdS, PAr and StOP. Enter the same address, speed, parity and stop bits in the Edge serial client, then leave the menu without changing anything else.

4. Wire the RS-485 pair

   Connect + to terminal 15 and - to terminal 17 with shielded twisted pair, as in Socomec's LIYCY-CY drawing. Fit a 120 ohm resistor between + and - at the ends of the line where needed. Terminal 13 is marked NC on the meter and in the instructions but 0 V in the catalogue drawing, so follow the label on the installed unit for the shield.

5. Make one frequency read

   Send FC03 to address 51287 for one register and divide the result by 100, as in the worked read below. Compare it with frequency on the display under the V F key.

6. Confirm the word order, then add points

   Read V1 at 50520 as two registers, high word first, and compare it with the display before enabling other 32-bit points. Then add current, power and energy from the same block, log Ea+ and Ea- separately where export is possible, and keep FC06 and FC16 out of the configuration.

Common questions

Which register block should I use for current and power?

Use the 32-bit block from 50512, which Socomec marks as affected by the current and voltage transformers, so currents, powers and energy are on the primary side. The table also has a 16-bit block from 51280 marked not affected by the transformers, with currents in mA in one register; it does not explain that block further, so use it for frequency and power factor, where the CT ratio makes no difference.¹

What function code and word order does the A-10 use?

The A-10 table marks its measurement blocks READ and its setup blocks READ, WRITE and WRITE_MANY without printing function-code numbers or a word order. Socomec's current tables define those labels as functions 3, 6 and 16 and decode U32 and S32 values high word first. Start with the one-register frequency read, then confirm the word order on a 32-bit voltage before adding more points.^1, 4

Can the energy counters be reset?

Yes. The table labels the energy at 50780 to 50788 partial, the display's rSET item zeroes counters, and the reset command at 1024 can clear kWh+, kWh-, kvarh and the hour meter over Modbus. Store each reading with its timestamp and treat a drop as a reset, not negative consumption. The counters move in whole kWh, which is coarse for short intervals on small loads.^1, 2

Should I use the non-resettable energy rows at 51311 to 51314?

Not without Socomec's confirmation. The table lists total positive and negative active and reactive energy there as single U16 registers with the unit written as Wh / 1E-06, which cannot hold a meter-sized total as printed. Use the 32-bit counters and compare them with the display.¹

Is the tariff input a dry contact?

No. With no voltage on terminals 8 and 10 the meter uses tariff 1, and an AC voltage selects tariff 2. The instructions give 110 to 277 V AC and the catalogue 200 to 277 V AC, so have the installer check the circuit against the installed meter. The current tariff is readable at 50849.^1, 2, 3