Fuji PXR temperature controller

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.

structure-verified

Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.

point	address (0-based)	type	scale	unit
Write in non-volatile memory (FIX execution)	0	U16	1
PID/FUZZY/SELF selection	1	U16	1
SV value set on face panel	2	U16	1
Control RUN/standby	3	U16	1
Alarm 2 ON/OFF	4	U16	1
P	5	U16	1
I	6	U16	1
D	7	U16	1
Alarm 1 output	8	U16	1
Alarm 2 output	9	U16	1
Dead band	10	I16	1
HB alarm relay output	11	U16	1
Alarm 1 ON/OFF	12	U16	1
Alarm 2 ON/OFF	13	U16	1
SV offset	14	I16	1
HB alarm relay output	15	U16	1
Temperature unit	16	U16	1
Input scale lower limit	17	I16	1
Input scale upper limit	18	I16	1
Decimal point place	19	U16	1
Input filter time constant	21	U16	1
RCJ yes/no	22	U16	1
MV limit kind	23	U16	1
Output 1 lower limit	24	I16	1
Output 1 upper limit	25	I16	1
Output 2 lower limit	26	I16	1
Output 2 upper limit	27	I16	1
Set value (SV) lower limit	30	U16	1
Set value (SV) upper limit	31	U16	1
Heater burnout alarm set value	38	U16	1
Setting lock	39	U16	1
Alarm 1 type	40	U16	1
Alarm 2 type	41	U16	1
Alarm 1 set value or alarm 1 lower limit set value	43	I16	1
Alarm 2 set value or alarm 2 lower limit set value	44	I16	1
Alarm 1 upper limit set value	46	I16	1
Alarm 2 upper limit set value	47	I16	1
Alarm 1 hysteresis	49	U16	1
Alarm 2 hysteresis	50	U16	1
Alarm 1 ON-delay set value	52	U16	1
Alarm 2 ON-delay set value	53	U16	1
Ramp/soak No. 1 target value	56	U16	1
Ramp/soak No. 2 target value	57	U16	1
Ramp/soak No. 3 target value	58	U16	1
Ramp/soak No. 4 target value	59	U16	1
Ramp/soak No. 5 target value	60	U16	1
Ramp/soak No. 6 target value	61	U16	1
Ramp/soak No. 7 target value	62	U16	1
Ramp/soak No. 8 target value	63	U16	1
Ramp/soak No. 1 ramp time	64	U16	1
Ramp/soak No. 1 soak time	65	U16	1
Ramp/soak No. 2 ramp time	66	U16	1
Ramp/soak No. 2 soak time	67	U16	1
Ramp/soak No. 3 ramp time	68	U16	1
Ramp/soak No. 3 soak time	69	U16	1
Ramp/soak No. 4 ramp time	70	U16	1
Ramp/soak No. 4 soak time	71	U16	1
Ramp/soak No. 5 ramp time	72	U16	1
Ramp/soak No. 5 soak time	73	U16	1
Ramp/soak No. 6 ramp time	74	U16	1
Ramp/soak No. 6 soak time	75	U16	1
Ramp/soak No. 7 ramp time	76	U16	1
Ramp/soak No. 7 soak time	77	U16	1
Ramp/soak No. 8 ramp time	78	U16	1
Ramp/soak No. 8 soak time	79	U16	1
Ramp/soak mode	80	U16	1
Ramp/soak command	81	U16	1
Ramp/soak pattern selection	82	U16	1
PV stable range	84	U16	1
Communication DI action request	86	U16	1
Control action type code	87	U16	1
Output proportional cycle (output 1)	88	U16	1
Output proportional cycle (output 2)	89	U16	1
Alarm 1 option function	91	U16	1
Alarm 2 option function	92	U16	1
DI1 action setting	94	U16	1
Hysteresis mode setting	96	U16	1
User zero adjustment	98	I16	1
User span adjustment	99	I16	1
DSP1	100	U16	1
DSP2	101	U16	1
DSP3	102	U16	1
DSP4	103	U16	1
DSP5	104	U16	1
DSP6	105	U16	1
DSP7	106	U16	1
DSP8	107	U16	1
DSP9	108	U16	1
DSP10	109	U16	1
DSP11	110	U16	1
DSP12	111	U16	1
DSP13	112	U16	1
Non-volatile memory write-in (FIX execution)	1000	U16	1
Process value (PV)	1000	I16	1
PID/FUZZY/SELF selection	1001	U16	1
Currently used set value (SV)	1001	I16	1
SV value controlled on face panel	1002	I16	1
Currently used deviation (DV)	1002	I16	1
Control RUN/standby	1003	U16	1
MV (output 1)	1003	I16	0.01	%
Auto tuning command	1004	U16	1
MV (output 2)	1004	I16	0.01	%
P	1005	U16	0.1	%
Station No.	1005	U16	1
I	1006	U16	0.1	sec
Alarm status	1006	U16	1
D	1007	U16	0.1	sec
Input/main unit abnormal status	1007	U16	1
Hysteresis range at two-position control	1008	U16	1
Ramp/soak current running position	1008	U16	1
COOL	1009	U16	1
Dead band	1010	I16	1
Anti-reset windup	1011	I16	1
Output convergence value	1012	I16	1
PV shift	1013	I16	1
SV offset	1014	I16	1
Input type code	1015	U16	1
Temperature unit	1016	U16	1
Input scale lower limit	1017	I16	1
Input scale upper limit	1018	I16	1
Decimal point place	1019	U16	1
Input filter time constant	1021	U16	1
RCJ yes/no	1022	U16	1
MV limit kind	1023	U16	1
Output 1 lower limit	1024	I16	1
Output 1 upper limit	1025	I16	1
Output 2 lower limit	1026	I16	1
Output 2 upper limit	1027	I16	1
Set value (SV) lower limit	1030	I16	1
Set value (SV) upper limit	1031	I16	1
Heater burnout alarm set value	1038	U16	1
Setting lock	1039	U16	1
Alarm 1 type	1040	U16	1
Alarm 2 type	1041	U16	1
Alarm 1 set value or alarm 1 lower limit set value	1043	I16	1
Alarm 2 set value or alarm 2 lower limit set value	1044	I16	1
Alarm 1 upper limit set value	1046	I16	1
Alarm 2 upper limit set value	1047	I16	1
Alarm 1 hysteresis	1049	U16	1
Alarm 2 hysteresis	1050	U16	1
Alarm 1 ON-delay set value	1052	U16	1
Alarm 2 ON-delay set value	1053	U16	1
Ramp/soak No. 1 target value	1056	I16	1
Ramp/soak No. 2 target value	1057	I16	1
Ramp/soak No. 3 target value	1058	I16	1
Ramp/soak No. 4 target value	1059	I16	1
Ramp/soak No. 5 target value	1060	I16	1
Ramp/soak No. 6 target value	1061	I16	1
Ramp/soak No. 7 target value	1062	I16	1
Ramp/soak No. 8 target value	1063	I16	1
Ramp/soak No. 1 ramp time	1064	U16	1
Ramp/soak No. 1 soak time	1065	U16	1
Ramp/soak No. 2 ramp time	1066	U16	1
Ramp/soak No. 2 soak time	1067	U16	1
Ramp/soak No. 3 ramp time	1068	U16	1
Ramp/soak No. 3 soak time	1069	U16	1
Ramp/soak No. 4 ramp time	1070	U16	1
Ramp/soak No. 4 soak time	1071	U16	1
Ramp/soak No. 5 ramp time	1072	U16	1
Ramp/soak No. 5 soak time	1073	U16	1
Ramp/soak No. 6 ramp time	1074	U16	1
Ramp/soak No. 6 soak time	1075	U16	1
Ramp/soak No. 7 ramp time	1076	U16	1
Ramp/soak No. 7 soak time	1077	U16	1
Ramp/soak No. 8 ramp time	1078	U16	1
Ramp/soak No. 8 soak time	1079	U16	1
Ramp/soak mode	1080	U16	1
Ramp/soak command	1081	U16	1
Ramp/soak pattern selection	1082	U16	1
PV stable range	1084	I16	1
Communication DI action request	1086	U16	1
Control action type code	1087	U16	1
Output proportional cycle (output 1)	1088	U16	1
Output proportional cycle (output 2)	1089	U16	1
Alarm 1 option function	1091	U16	1
Alarm 2 option function	1092	U16	1
DI1 action setting	1094	U16	1
Hysteresis mode setting	1096	U16	1
User zero adjustment	1098	I16	1
User span adjustment	1099	I16	1
DSP1	1100	U16	1
DSP2	1101	U16	1
DSP3	1102	U16	1
DSP4	1103	U16	1
DSP5	1104	U16	1
DSP6	1105	U16	1
DSP7	1106	U16	1
DSP8	1107	U16	1
DSP9	1108	U16	1
DSP10	1109	U16	1
DSP11	1110	U16	1
DSP12	1111	U16	1
DSP13	1112	U16	1

link settings as documented (unverified): RTU; default 9600 8O1; unit ID 1; FC 01,02,03,04,05,06,16; Transmission speed, data length, and stop bit are fixed.

⚠ For avoiding electric shock and malfunctions, do not turn on the power supply until all wiring have been completed. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	7 (+), 8 (-)
A/B polarity	7 is +, 8 is -
termination	Both ends of the cable should be terminated with terminating resistors 100 ohm 1/2W
connector	Terminal block
isolation	Functional isolation between transmission circuit and others (withstand voltage: 500V AC)
shield/ground	The shield wire of the cable should be grounded at one place on the master station unit side.
wiring notes	Recommended cable: UL2464, UL2448, etc. Recommended noise filter: ZRAC2203-11/TDK
max registers/read	60
broadcast	not supported
protocol notes	While the data is being written in non-volatile memory after write via communication, the next write is attempted and will result in no response.
FC 43 device ID	not supported
doc revision	INP-TN512642a-E

⚠ disputed: terminals: "7 (+), 8 (-)" and polarity: "7 is +, 8 is -" — disputed by the official manual [3.4.1]. This terminal allocation is only correct for the PXR4 model. The PXR3 uses terminals 15 (+) and 14 (-), while the PXR5 and PXR9 use terminals 1 (+) and 2 (-).

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

The Process Value (PV) at register 31001 (relative address 1000) is located in the read-only Input Register space (3xxxx) and must be read using Modbus Function Code 04H. Attempting to read it using Function Code 03H (Read Holding Registers) is a common integration pitfall that will result in a Modbus exception response. [source]
During the non-volatile memory write-in (FIX) process triggered by writing 1 to register 40001/41001, the controller will not respond to any incoming Modbus commands for approximately 5 seconds. [source]
confirmed: Document revision INP-TN512642a-E matches the Fuji Electric Micro Controller X (PXR) RS-485 Modbus Communication Manual [1.2.3].
confirmed: Default communication settings are 9600 bps, 8 data bits, 1 stop bit, and Odd parity (CoM = 0), with a default station number (unit ID) of 1.
confirmed: Modbus RTU communication is prohibited if the station number is set to 0, meaning broadcast is not supported.

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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