verified connector library

Phoenix Contact EMpro EEM-MA370 power 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
firmware_revision256U32BE1
day_of_production336U161
month_of_production337U161
year_of_production338U161
hour_of_production339U161
minute_of_production340U161
second_of_production341U161
serial_number342U32BE1
hardware_revision346U161

link settings as documented (unverified): RTU/TCP; default 19200 8E1; unit ID 1; FC 03,04,06,16; Modbus/TCP opens port 502. Up to four Modbus/TCP connections can be open in parallel.

⚠ Only use external current transformers with reinforced or double isolation. Install current transformers and corresponding measuring devices only when the power supply of the system is disconnected. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)
terminalsGND, B-, A+, Ω
A/B polarityA+ (non-inverted), B- (inverted)
terminationIntegrated 120 Ω resistor, activated by bridging terminals Ω and A+
connectorRS-485 connection, RJ45 Ethernet connection
isolationBasic insulation against neighboring devices up to 300 V OVC III. Minimum clearance of 6 mm to neighboring elements must be maintained to achieve double insulation.
shield/groundGND: Shield of signal line
wiring notesMaximum tightening torque for the relevant screws: 0.5 Nm ... 0.6 Nm.
response timeout250 ms
broadcastsupported
protocol notesThe device does not differentiate between holding and input registers. Both function codes return the same registers.
identification notesThe device has three NetBios names, including manufacturer-specific NetBios names containing the device name and serial number.
power100 V AC ... 230 V AC ±20%, 150 V DC ... 250 V DC ±20%
accuracyWhen measuring by means of current transformers or Rogowski coils, the accuracy is greatly influenced by the quality of the current sensors used.
doc revisionUM EN EMpro DIN rail, Revision 00

generated by gemini:gemini-3.5-flash · harvested from https://media.digikey.com/pdf/Data%20Sheets/Phoenix%20Contact%20PDFs/um_en_empro_din_rail_109357_en_00_UM.pdf (Phoenix Contact); 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.