verified connector library

Selec MFM384 multifunction meter

Register map(s) for this device, each at the trust rung it earned. Addresses are 0-based as on the wire; word order and scaling are only confirmed at the hardware-verified rung.

interop-verified

Read + decoded cleanly over a real network vs an independent third-party Modbus test server (transport and framing; reads are remapped into the server's register window, so the map's own addresses are NOT exercised). Does NOT prove word order/scaling against the actual device.

pointaddress (0-based)typescaleunit
voltage_v10F32BE1
voltage_v22F32BE1
voltage_v34F32BE1
voltage_v126F32BE1
voltage_v238F32BE1
voltage_v3110F32BE1
voltage_avg_ln12F32BE1
voltage_avg_ll14F32BE1
current_i116F32BE1
current_i218F32BE1
current_i320F32BE1
current_avg22F32BE1
active_power_p124F32BE1
active_power_p226F32BE1
active_power_p328F32BE1
active_power_total30F32BE1
reactive_power_q132F32BE1
reactive_power_q234F32BE1
reactive_power_q336F32BE1
reactive_power_total38F32BE1
apparent_power_s140F32BE1
apparent_power_s242F32BE1
apparent_power_s344F32BE1
apparent_power_total46F32BE1
power_factor_pf148F32BE1
power_factor_pf250F32BE1
power_factor_pf352F32BE1
power_factor_avg54F32BE1
frequency56F32BE1
active_energy58F32BE1
reactive_energy60F32BE1
apparent_energy62F32BE1

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 1; MODBUS RTU protocol over RS485. Half duplex.

bench facts as documented (unverified)
terminalsScrew terminals with protection covering
A/B polarityRS485 + and -
terminationSuggested terminating resistor (120 ohm, 1/4 watt)
shield/groundShielded cable
wiring notesTransmission distance 500 m maximum
response timeout100 ms
protocol notesResponse time is 100 ms independent of baud rate
power85 to 270V AC/DC auxiliary supply, 50/60Hz, Power Consumption: 0.5 VA max. @ 5A per phase
environmentOperating temperature: 0 to +50°C, Storage temperature: -20 to +75°C, Humidity: 95% (non condensing)
accuracyVoltage/Current: ±0.5% of Full scale, Frequency: ±0.1%, Active/Apparent/Reactive Power & Energy: Class 1
doc revisionOperating / 1008 / MFM384 / Ver1A, OP278-V01A

generated by gemini:gemini-3.5-flash · harvested from https://www.site-electrics.co.uk/pdfs/Selec_Multifunction_Meter_Manual.pdf (Selec); manual-faithful — the document's claims, panel risk: LOW — panel concurs, no field disagreements; proved interop-verified on 2026-06-10 · recorded 2026-06-10

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

Need it proven on your own device? Hardware verification — if it doesn't verify, you don't pay.

Building a platform? License the verified library — machine-readable maps, firmware matrix, API access.