GE Multilin 469 motor management relay

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale	unit
Product device code	0	U16	1
Product hardware revision	1	U16	1
Product software revision	2	U16	1
Product modification number	3	U16	1
Boot program revision	16	U16	1
Boot program modification number	17	U16	1
Command function code	128	U16	1
Communications port passcode	136	I32BE	1
motor_status	512	U16	1
motor_thermal_capacity_used	513	U16	1	%
estimated_time_to_trip_on_overload	514	I32BE	1	s
motor_speed	516	U16	1
communication_setpoint_access	517	U16	1
General status	528	U16	1
Output relay status	529	U16	1
Cause of last trip	544	U16	1
Time of last trip (2 words)	545	U32BE	1
Date of last trip (2 words)	547	U32BE	1
Motor speed during trip	549	U16	1
Pre-trip tachometer RPM	550	U16	1	RPM
Phase A pre-trip current	551	U32BE	1	A
Phase B pre-trip current	553	U32BE	1	A
Phase C pre-trip current	555	U32BE	1	A
Pre-trip motor load	557	U16	0.01	FLA
Pre-trip current unbalance	558	U16	1	%
Pre-trip ground current	559	U32BE	0.01	A
Phase A pre-trip differential current	561	U16	1	A
Phase B pre-trip differential current	562	U16	1	A
Phase C pre-trip differential current	563	U16	1	A
Hottest stator RTD during trip	564	U16	1
Pre-trip temperature of hottest stator RTD	565	I16	1	°C
Hottest bearing RTD during trip	566	U16	1
Pre-trip temperature of hottest bearing RTD	567	I16	1	°C
Hottest other RTD during trip	568	U16	1
Pre-trip temperature of hottest other RTD	569	I16	1	°C
Hottest ambient RTD during trip	570	U16	1
Pre-trip ambient RTD temperature	571	I16	1	°C
Pre-trip voltage Vab	572	U16	1	V
Pre-trip voltage Vbc	573	U16	1	V
Pre-trip voltage Vca	574	U16	1	V
pre_trip_voltage_van	575	U16	1	V
pre_trip_voltage_vbn	576	U16	1	V
pre_trip_voltage_vcn	577	U16	1	V
pre_trip_system_frequency	578	U16	0.01	Hz
pre_trip_real_power	579	I32BE	1	kW
pre_trip_reactive_power	581	I32BE	1	kvar
pre_trip_apparent_power	583	U16	1	kVA
pre_trip_power_factor	584	I16	0.01
analog_input_1_pre_trip_power	585	I32BE	1
Remote alarm status	613	U16	1
Overload lockout block	688	U16	1	minutes
Access switch status	720	U16	1
Phase A current	768	U32BE	1	A
Phase B current	770	U32BE	1	A
Phase C current	772	U32BE	1	A
average_phase_current	774	U32BE	1	A
motor_load	776	U16	0.01	FLA
current_unbalance	777	U16	1	%
equivalent_motor_load	778	U16	0.01	FLA
ground_current	779	U32BE	0.01	A
phase_a_differential_current	781	U16	1	A
phase_b_differential_current	782	U16	1	A
phase_c_differential_current	783	U16	1	A
hottest_stator_rtd	800	I16	1	°C
rtd_1_temperature	801	I16	1	°C
rtd_2_temperature	802	I16	1	°C
rtd_3_temperature	803	I16	1	°C
rtd_4_temperature	804	I16	1	°C
rtd_5_temperature	805	I16	1	°C
rtd_6_temperature	806	I16	1	°C
rtd_7_temperature	807	I16	1	°C
rtd_8_temperature	808	I16	1	°C
rtd_9_temperature	809	I16	1	°C
rtd_10_temperature	810	I16	1	°C
rtd_11_temperature	811	I16	1	°C
rtd_12_temperature	812	I16	1	°C
hottest_stator_rtd_in_fahrenheit	816	I16	1	°F
rtd_1_temperature_in_fahrenheit	817	I16	1	°F
rtd_2_temperature_in_fahrenheit	818	I16	1	°F
rtd_3_temperature_in_fahrenheit	819	I16	1	°F
rtd_4_temperature_in_fahrenheit	820	I16	1	°F
rtd_5_temperature_in_fahrenheit	821	I16	1	°F
rtd_6_temperature_in_fahrenheit	822	I16	1	°F
rtd_7_temperature_in_fahrenheit	823	I16	1	°F
rtd_8_temperature_in_fahrenheit	824	I16	1	°F
rtd_9_temperature_in_fahrenheit	825	I16	1	°F
rtd_10_temperature_in_fahrenheit	826	I16	1	°F
rtd_11_temperature_in_fahrenheit	827	I16	1	°F
rtd_12_temperature_in_fahrenheit	828	I16	1	°F
vab	832	U16	1	V
vbc	833	U16	1	V
vca	834	U16	1	V
average_line_voltage	835	U16	1	V
van	836	U16	1	V
vbn	837	U16	1	V
vcn	838	U16	1	V
average_phase_voltage	839	U16	1	V
system_frequency	840	U16	0.01	Hz
Tachometer RPM	864	U16	1	RPM
power_factor	880	I16	0.01
real_power	881	I32BE	1	kW
real_power_hp	883	U16	1	hp
reactive_power	884	I32BE	1	kvar
apparent_power	886	U16	1	kVA
mwh_consumption	887	U32BE	0.001	MWh
mvarh_consumption	889	U32BE	0.001	Mvarh
mvarh_generation	891	U32BE	0.001	Mvarh
torque	893	U32BE	0.1	Nm/ftlb
current_demand	912	U32BE	1	A
real_power_demand	914	I32BE	1	kW
reactive_power_demand	916	I32BE	1	kvar
apparent_power_demand	918	U16	1	kVA
peak_current_demand	919	U32BE	1	A
peak_real_power_demand	921	I32BE	1	kW
peak_reactive_power_demand	923	I32BE	1	kvar
peak_apparent_power_demand	925	U16	1	kVA
analog_input_1	944	I32BE	1
analog_input_2	946	I32BE	1
analog_input_3	948	I32BE	1
analog_input_4	950	I32BE	1
analog_input_1_2_difference	952	I32BE	1
analog_input_3_4_difference	954	I32BE	1
Total number of trips	1072	U16	1
Number of motor starts	1136	U16	1
Motor running hours	1184	U32BE	1	hours
Order code	1216	U16	1
Relay serial number (read only)	1217	U16	1
Va angle	1280	U16	1	°
Default message cycle time	4096	U16	0.1	s
Slave address	4112	U16	1
Computer RS485 baud rate	4113	U16	1
Computer RS485 parity	4114	U16	1
Ethernet IP address	4128	U32BE	1
Clear last trip data prompt	4400	U16	1
Reset motor information	4416	U16	1
Phase CT primary	4480	U16	1	A
Voltage transformer connection type	4512	U16	1

link settings as documented (unverified): RTU; baud 1200/2400/4800/9600/19200; unit ID 254; FC 01,02,03,04,05,06,07,08,16; Supports up to 32 slaves on a single RS485 channel.

bench facts as documented (unverified)

terminals	one of two 2-wire RS485 ports from the rear terminal connector or the RS232 from the front panel connector
A/B polarity	Each '+' terminal of every 469 must be connected together for the system to operate
termination	120 ohm resistor in series with a 1 nF ceramic capacitor when used with Belden 9841 RS485 wire
connector	rear terminal connector or front panel connector
shield/ground	Shielded wire should always be used to minimize noise
max registers/read	125
broadcast	supported
protocol notes	Maximum of 60 holding registers can be stored in one transmission using function code 16.
model register	04C0
serial register	04C1
certifications	ISO9001:2000
doc revision	GEK-106491H
firmware applicability	5.1x

⚠ disputed: Function codes [1, 2, 3, 4, 5, 6, 7, 8, 16] — disputed by GE 469 Communication FAQs which state only function codes 3, 4, 5, 6, 7, 8, and 16 are supported (FC 1 and 2 are not supported)

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

Users reading 32-bit values (such as energy accumulation or currents) may experience word-swapping or signed/unsigned conversion issues depending on the Modbus master configuration, resulting in wrapped or negative values. [source]
Upgrading or downgrading the relay firmware triggers a resettable 'EEPROM DATA ERROR' self-test message to warn the user that the Modbus register addresses have changed in the new firmware version. [source]
confirmed: Baud rates [1200, 2400, 4800, 9600, 19200] — confirmed by GE 469 Motor Management Relay Instruction Manual
confirmed: Default unit ID 254 — confirmed by GE 469 Motor Management Relay Instruction Manual
confirmed: Modbus register map addresses (e.g., motor_status @ 512, motor_thermal_capacity_used @ 513, phase_a_current @ 768) — confirmed by GE 469 Modbus Memory Map

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.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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