Banner SureCross DX85 remote I/O

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
discrete_in_1	0	U16	1
discrete_in_2	1	U16	1
discrete_in_3	2	U16	1
discrete_in_4	3	U16	1
analog_in_1	4	U16	1	mA/V
analog_in_2	5	U16	1	mA/V
device_message	7	U16	1
discrete_out_1	8	U16	1
discrete_out_2	9	U16	1
discrete_out_3	10	U16	1
discrete_out_4	11	U16	1
analog_out_1	12	U16	1	mA/V
analog_out_2	13	U16	1	mA/V
control_message	14	U16	1

link settings as documented (unverified): RTU; default 19200 8N1; unit ID 1; Baud rate and parity are configured via internal DIP switches. Slave ID is configured via rotary dials.

⚠ Do not use this device for personnel protection. Using this device for personnel protection could result in serious injury or death. — Starkest reads only; we never write a control register.

bench facts as documented (unverified)

terminals	External terminals for C models, 5-pin M12 male quick-disconnect connector for non-C models
A/B polarity	RS485 / D1 / B / + and RS485 / D0 / A / -
connector	5-pin M12 male or external terminals
shield/ground	Comms Ground on Pin 5 of M12
power	10 V DC to 30 V DC (Outside the USA: 12 V DC to 24 V DC, ± 10%). Consumption: Less than 1.4 W (60 mA) at 24 V DC.
environment	Operating temperature: -40 °C to +85 °C (Electronics), -20 °C to +80 °C (LCD). 95% max relative humidity (non-condensing). IP67/NEMA 6 or IP20/NEMA 1 depending on model.
accuracy	0.1% of full scale +0.01% per °C for analog inputs and outputs
certifications	UL Listed
doc revision	131629 Rev. I

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

confirmed: comms defaults (baud rate 19200, no parity, 1 stop bit, Modbus RTU) — confirmed by SureCross DX85 Modbus RTU Remote I/O Device Datasheet (p/n 131599 / 131629) [1.2.2]
confirmed: physical connector and terminals (5-pin M12 male or external terminals for C models) — confirmed by DX85 Modbus RTU Remote IO (4422) Device Manual (p/n 131629)
confirmed: RS485 polarity (RS485 / D1 / B / + and RS485 / D0 / A / -) — confirmed by Sure Cross DX85 Modbus RTU Remote I/O Device Manual (p/n 131629)
confirmed: shield ground (Comms Ground on Pin 5 of M12) — confirmed by Sure Cross DX85 Modbus RTU Remote I/O Device Manual (p/n 131629)
confirmed: analog accuracy (0.1% of full scale +0.01% per °C) — confirmed by DX85 Modbus RTU Remote IO (4422) Device Manual (p/n 131629)
confirmed: register map (discrete_in_1 @ 0, discrete_in_2 @ 1, discrete_in_3 @ 2, discrete_in_4 @ 3, analog_in_1 @ 4, analog_in_2 @ 5, device_message @ 7, discrete_out_1 @ 8, discrete_out_2 @ 9, discrete_out_3 @ 10, discrete_out_4 @ 11, analog_out_1 @ 12, analog_out_2 @ 13, control_message @ 14) — confirmed by DX85 Modbus RTU Remote IO (4422) Device Manual (p/n 131629)

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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