Hitachi WJ200 drive

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 confirmed at the hardware-verified rung and at no rung below it.

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.

point	address (0-based)	type	scale	unit
output_frequency_monitor	4096	U32BE	0.01
output_current_monitor	4098	U16	0.1	Hz
rotation_direction_monitoring	4099	U16	1	A
process_variable_pid_feedback_monitoring	4100	U32BE	0.1
intelligent_input_terminal_status	4102	U16	1
intelligent_output_terminal_status	4103	U16	1
scaled_output_frequency_monitor	4104	U32BE	0.01
actual_frequency_monitor	4106	U32BE	0.01
torque_command_monitor	4108	I16	1
torque_bias_monitor	4109	I16	1
torque_monitor	4111	I16	1
output_voltage_monitor	4112	U16	0.1
power_monitor	4113	U16	0.1	V
watt_hour_monitor	4114	U32BE	0.1	kW
elapsed_run_time_monitor	4116	U32BE	1
elapsed_power_on_time_monitor	4118	U32BE	1
heat_sink_temperature_monitor	4120	I16	0.1
dc_voltage_monitoring	4133	U16	0.1
brd_load_factor_monitoring	4134	U16	0.1	V
electronic_thermal_overload_monitoring	4135	U16	0.1	%

link settings as documented (unverified): RTU; default 9600 8N1; unit ID 1; FC 01,03,05,06,08,15,16,23; Built-in RS-485 serial communications, featuring the ModBus RTU protocol.

bench facts as documented (unverified)

terminals	SP, SN
A/B polarity	SP (+), SN (-)
termination	Built-in 200 ohm resistor activated by a dip switch
connector	Terminal connector
max registers/read	16
response timeout	0 ms
broadcast	supported
protocol notes	Silent interval of 3.5 characters is required for latency time.
identification notes	No explicit model/serial/firmware registers defined in the Modbus holding register list.
power	Single-phase 200V class, Three-phase 200V class, Three-phase 400V class
environment	Ambient temperature: -10 to 50 °C, Humidity: 20 to 90% RH (non-condensing), Vibration: 5.9 m/s2 (0.6 G) 10 ~ 55Hz, Location: Altitude 1000m or less, indoors
accuracy	Digital command: ±0.01% of maximum frequency, Analog command: ±0.2% of maximum frequency
certifications	CE, UL, ISO13849-1
doc revision	NT325X, May 2010

field reports — community-sourced, unverified (checked 2026-06-11)

The WJ200 has a firmware bug where the 'is_at_speed' status bit is set even if the motor is running in the wrong direction. [source]
confirmed: comms defaults (baud rate 9600, unit ID 1, parity N, stop bits 1, RTU framing) — confirmed by Hitachi WJ200 Series Inverter Instruction Manual (NT325X)
confirmed: physical terminals (SP, SN) and polarity (SP (+), SN (-)) — confirmed by Hitachi WJ200 Series Inverter Instruction Manual (NT325X)
confirmed: built-in 200 ohm termination resistor activated by a dip switch — confirmed by Hitachi WJ200 Series Inverter Instruction Manual (NT325X)
confirmed: supported Modbus function codes (1, 3, 5, 6, 8, 15, 16, 23) — confirmed by Hitachi WJ200 Series Inverter Instruction Manual (NT325X)
confirmed: silent interval of 3.5 characters required for latency — confirmed by Hitachi WJ200 Series Inverter Instruction Manual (NT325X)
confirmed: maximum read registers limit of 16 — confirmed by Hitachi WJ200 Series Inverter Instruction Manual (NT325X)
confirmed: register map addresses (e.g., output_frequency_monitor @ 4096, output_current_monitor @ 4098, rotation_direction_monitoring @ 4099) — confirmed by Hitachi WJ200 Series Inverter Instruction Manual (NT325X) under 0-based addressing (register number - 1)
confirmed: environmental specifications (ambient temperature -10 to 50 °C, humidity 20 to 90% RH, vibration 5.9 m/s2 (0.6 G) 10 ~ 55Hz, altitude 1000m or less) — confirmed by Hitachi WJ200 Series Inverter Instruction Manual (NT325X)

The trust ladder

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

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
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.
simulator-verified — Decoded correctly against a protocol emulator seeded with known-true values — catches word-order/scaling errors vs the emulator, not the physical device.
hardware-verified x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

If your device isn't here, upload its register map. Generation is free, and the connector keeps the rung it earns under testing.

To prove a connector against your own device, order hardware verification. If it doesn't verify, you don't pay.

Platform builders can license the verified library: machine-readable maps, the firmware matrix, API access.