Red Lion PAX2A panel meter

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
Input Relative Value	0	I32BE	1
Maximum Value	2	I32BE	1
Minimum Value	4	I32BE	1
Total Value	6	I32BE	1
Setpoint 1 Value	8	I32BE	1
Setpoint 2 Value	10	I32BE	1
Setpoint 3 Value	12	I32BE	1
Setpoint 4 Value	14	I32BE	1
Setpoint 1 Band/Dev. Value	16	I32BE	1
Setpoint 2 Band/Dev. Value	18	I32BE	1
Setpoint 3 Band/Dev. Value	20	I32BE	1
Setpoint 4 Band/Dev. Value	22	I32BE	1
Setpoint Output Register (SOR)	24	U16	1
Manual Mode Register (MMR)	25	U16	1
Reset Output Register	26	U16	1
Analog Output Register (AOR)	27	U16	1
Input Absolute Value	28	I32BE	1
Input Offset Value	30	I32BE	1
Input Range	80	U16	1
Temperature Scale (TC or RTD only)	81	U16	1
Ice Point Compensation (TC only)	82	U16	1
ADC Conversion Rate (samples/sec)	83	U16	1
Decimal Point	84	U16	1
Rounding Factor	85	U16	1
Digital Input Filter	86	U16	1
Filter Band	87	U16	1
Input Scaling Points in List Function	88	U16	1
Number of Scaling Points (List A)	99	U16	1
Reserved (List A)	100	U16	1
Scaling Pt.1 Input Value (Hi word) (List A)	101	U16	1
Scaling Pt.1 Input Value (Lo word) (List A)	102	U16	1
Scaling Pt.1 Display Value (Hi word) (List A)	103	U16	1
Scaling Pt.1 Display Value (Lo word) (List A)	104	U16	1
Scaling Pt.16 Input Value (Hi word) (List A)	162	U16	1
Scaling Pt.16 Input Value (Lo word) (List A)	163	U16	1
Scaling Pt.16 Display Value (Hi word) (List A)	164	U16	1
Scaling Pt.16 Display Value (Lo word) (List A)	165	U16	1
Setpoint 1 Value (Hi word) (List A)	166	U16	1
Setpoint 1 Value (Lo word) (List A)	167	U16	1
Setpoint 2 Value (Hi word) (List A)	168	U16	1
Setpoint 2 Value (Lo word) (List A)	169	U16	1
Setpoint 3 Value (Hi word) (List A)	170	U16	1
Setpoint 3 Value (Lo word) (List A)	171	U16	1
Setpoint 4 Value (Hi word) (List A)	172	U16	1
Setpoint 4 Value (Lo word) (List A)	173	U16	1
Setpoint 1 Band/Dev. Value (Hi word) (List A)	174	U16	1
Setpoint 1 Band/Dev. Value (Lo word) (List A)	175	U16	1
Setpoint 2 Band/Dev. Value (Hi word) (List A)	176	U16	1
Setpoint 2 Band/Dev. Value (Lo word) (List A)	177	U16	1
Setpoint 3 Band/Dev. Value (Hi word) (List A)	178	U16	1
Setpoint 3 Band/Dev. Value (Lo word) (List A)	179	U16	1
Setpoint 4 Band/Dev. Value (Hi word) (List A)	180	U16	1
Setpoint 4 Band/Dev. Value (Lo word) (List A)	181	U16	1
Number of Scaling Points (List B)	200	U16	1
Reserved (List B)	201	U16	1
Scaling Pt.1 Input Value (Hi word) (List B)	202	U16	1
Scaling Pt.1 Input Value (Lo word) (List B)	203	U16	1
Scaling Pt.1 Display Value (Hi word) (List B)	204	U16	1
Scaling Pt.1 Display Value (Lo word) (List B)	205	U16	1
Scaling Pt.16 Input Value (Hi word) (List B)	262	U16	1
Scaling Pt.16 Input Value (Lo word) (List B)	263	U16	1
Scaling Pt.16 Display Value (Hi word) (List B)	264	U16	1
Scaling Pt.16 Display Value (Lo word) (List B)	265	U16	1
Setpoint 1 Value (Hi word) (List B)	266	U16	1
Setpoint 1 Value (Lo word) (List B)	267	U16	1
Setpoint 2 Value (Hi word) (List B)	268	U16	1
Setpoint 2 Value (Lo word) (List B)	269	U16	1
Setpoint 3 Value (Hi word) (List B)	270	U16	1
Setpoint 3 Value (Lo word) (List B)	271	U16	1
Setpoint 4 Value (Hi word) (List B)	272	U16	1
Setpoint 4 Value (Lo word) (List B)	273	U16	1
Setpoint 1 Band/Dev. Value (Hi word) (List B)	274	U16	1
Setpoint 1 Band/Dev. Value (Lo word) (List B)	275	U16	1
Setpoint 2 Band/Dev. Value (Hi word) (List B)	276	U16	1
Setpoint 2 Band/Dev. Value (Lo word) (List B)	277	U16	1
Setpoint 3 Band/Dev. Value (Hi word) (List B)	278	U16	1
Setpoint 3 Band/Dev. Value (Lo word) (List B)	279	U16	1
Setpoint 4 Band/Dev. Value (Hi word) (List B)	280	U16	1
Setpoint 4 Band/Dev. Value (Lo word) (List B)	281	U16	1
User Input Active State	300	U16	1
User Input 1 Action	301	U16	1
User Input 2 Action	302	U16	1
User F1 Key Action	303	U16	1
User F2 Key Action	304	U16	1
User F1 Second Action	305	U16	1
User F2 Second Action	306	U16	1
Line 1 Display Color	330	U16	1
Display Intensity Level	331	U16	1
Display Contrast Level	332	U16	1
Line 1 Display	333	U16	1
Units Mnemonic	334	U16	1
Units Digit 1 (Left)	335	U16	1
Units Digit 2 (Center)	336	U16	1
Units Digit 3 (Right)	337	U16	1
Line 2 Input Display Access	338	U16	1
Line 2 Totalizer Display Access	339	U16	1
Line 2 Maximum (Hi) Value Access	340	U16	1
Line 2 Minimum (Lo) Value Access	341	U16	1
Line 2 List Selection Access	342	U16	1
Line 2 Setpoint 1 Value Access	343	U16	1
Line 2 S1 Band/Dev. Value Access	344	U16	1
Line 2 Setpoint 2 Value Access	345	U16	1
Line 2 S2 Band/Dev.Value Access	346	U16	1
Line 2 Setpoint 3 Value Access	347	U16	1
Line 2 S3 Band/Dev.Value Access	348	U16	1
Line 2 Setpoint 4 Value Access	349	U16	1
Line 2 S4 Band/Dev.Value Access	350	U16	1
Line 2 Display Color Access	355	U16	1
Line 2 Display Intensity Level Access	356	U16	1
Line 2 Display Contrast Level Access	357	U16	1
Line 2 Zero (Tare) Display Access	358	U16	1
Line 2 Batch Input to Totalizer Access	359	U16	1
Line 2 Reset Totalizer Access	360	U16	1
Line 2 Reset Max (Hi) Display Access	361	U16	1
Line 2 Reset Min (Lo) Display Access	362	U16	1
Line 2 Reset Max and Min Access	363	U16	1
Line 2 Reset Alarm 1 Access	364	U16	1
Line 2 Reset Alarm 2 Access	365	U16	1
Line 2 Reset Alarm 3 Access	366	U16	1
Line 2 Reset Alarm 4 Access	367	U16	1
Line 2 Reset Alarm 3 and 4 Access	368	U16	1
Line 2 Reset Alarm 2, 3 and 4 Access	369	U16	1
Line 2 Reset All Alarms (1-4) Access	370	U16	1
Line 2 Print Request Access	371	U16	1
Line 2 Security Code Value	372	U16	1
Max (Hi) Capture Value Assignment	380	U16	1
Max (Hi) Capture Delay Time	381	U16	1
Min (Lo) Capture Value Assignment	382	U16	1
Min (Lo) Capture Delay Time	383	U16	1
Display Update (readings per second)	384	U16	1
Totalizer Decimal Point	390	U16	1
Totalizer Time Base	391	U16	1
Totalizer Scale Factor	392	U16	1
Totalizer Reset at Power Up	393	U16	1
Totalizer Low Cut Value (Hi word)	394	U16	1
Totalizer Low Cut Value (Lo word)	395	U16	1
Assignment (Setpoint 1)	400	U16	1
Action (Setpoint 1)	401	U16	1
Hysteresis Value (Setpoint 1)	402	U16	1
On Time Delay (Setpoint 1)	403	U16	1
Off Time Delay (Setpoint 1)	404	U16	1
Output Logic (Setpoint 1)	405	U16	1
Reset Action (Setpoint 1)	406	U16	1
Standby Operation (Setpoint 1)	407	U16	1
Annunciator (Setpoint 1)	408	U16	1
Color (Setpoint 1)	409	U16	1
Probe Failure Action (TC or RTD only) (Setpoint 1)	410	U16	1
Assignment (Setpoint 2)	420	U16	1
Action (Setpoint 2)	421	U16	1
Hysteresis Value (Setpoint 2)	422	U16	1
On Time Delay (Setpoint 2)	423	U16	1
Off Time Delay (Setpoint 2)	424	U16	1
Output Logic (Setpoint 2)	425	U16	1
Reset Action (Setpoint 2)	426	U16	1
Standby Operation (Setpoint 2)	427	U16	1
Annunciator (Setpoint 2)	428	U16	1
Color (Setpoint 2)	429	U16	1
Probe Failure Action (TC or RTD only) (Setpoint 2)	430	U16	1
Assignment (Setpoint 3)	440	U16	1
Action (Setpoint 3)	441	U16	1
Hysteresis Value (Setpoint 3)	442	U16	1
On Time Delay (Setpoint 3)	443	U16	1
Off Time Delay (Setpoint 3)	444	U16	1
Output Logic (Setpoint 3)	445	U16	1
Reset Action (Setpoint 3)	446	U16	1
Standby Operation (Setpoint 3)	447	U16	1
Annunciator (Setpoint 3)	448	U16	1
Color (Setpoint 3)	449	U16	1
Probe Failure Action (TC or RTD only) (Setpoint 3)	450	U16	1
Assignment (Setpoint 4)	460	U16	1
Action (Setpoint 4)	461	U16	1
Hysteresis Value (Setpoint 4)	462	U16	1
On Time Delay (Setpoint 4)	463	U16	1
Off Time Delay (Setpoint 4)	464	U16	1
Output Logic (Setpoint 4)	465	U16	1
Reset Action (Setpoint 4)	466	U16	1
Standby Operation (Setpoint 4)	467	U16	1
Annunciator (Setpoint 4)	468	U16	1
Color (Setpoint 4)	469	U16	1
Probe Failure Action (TC or RTD only) (Setpoint 4)	470	U16	1
USB Mode	480	U16	1
Type	481	U16	1
Baud Rate	482	U16	1
Data Bits	483	U16	1
Parity	484	U16	1
Address	485	U16	1
Transmit Delay	486	U16	1
Abbreviated Transmission (RLC only)	487	U16	1
Print Options (RLC only)	488	U16	1
Load Serial Settings	489	U16	1
Type (Analog Output)	490	U16	1
Assignment (Analog Output)	491	U16	1
Analog Low Scale Value (Hi word)	492	U16	1
Analog Low Scale Value (Lo word)	493	U16	1
Analog High Scale Value (Hi word)	494	U16	1
Analog High Scale Value (Lo word)	495	U16	1
Update time	496	U16	1
Probe Failure Action (TC or RTD only)	497	U16	1
Slave ID	1000	U16	1

link settings as documented (unverified): RTU/ASCII; default 38400 8N?; unit ID 247; Type factory setting is Modbus ASCII (2). Data bits factory setting is 8 bits (1).

bench facts as documented (unverified)

max registers/read	32
protocol notes	Maximum 32 register writes and 32 register reads.
model register	41001
firmware register	41001
identification notes	Slave ID register 41001-41010 contains model 'RLC-PAX2A' and version number.
doc revision	4/15/13 LP0931A

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

confirmed: Baud rates [1200, 2400, 4800, 9600, 19200, 38400], default baud 38400, default unit ID 247, framing RTU/ASCII, and parity N — confirmed by Red Lion PAX2A Manual
confirmed: Slave ID register 41001-41010 contains model 'RLC-PAX2A' and version number — confirmed by Red Lion PAX2A Manual
confirmed: Maximum 32 register writes and 32 register reads — confirmed by Red Lion PAX2A Manual
confirmed: Register map addresses (e.g., input_relative_value at 40001, maximum_value at 40003, minimum_value at 40005, total_value at 40007, setpoint_1_value at 40009, setpoint_output_register at 40025, manual_mode_register at 40026, reset_output_register at 40027, analog_output_register at 40028, input_absolute_value at 40029, input_offset_value at 40031) — confirmed by Red Lion PAX2A Manual

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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