AutomationDirect Click PLC (C0 series)

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 only confirmed at the hardware-verified rung.

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
ds1	0	I16	1
ds2	1	I16	1
ds3	2	I16	1
ds4	3	I16	1
ds5	4	I16	1
ds6	5	I16	1
ds7	6	I16	1
ds8	7	I16	1
ds9	8	I16	1
ds10	9	I16	1
ds11	10	I16	1
ds12	11	I16	1
ds13	12	I16	1
ds14	13	I16	1
ds15	14	I16	1
ds16	15	I16	1
ds17	16	I16	1
ds18	17	I16	1
ds19	18	I16	1
ds20	19	I16	1

link settings as documented (unverified): RTU/ASCII/TCP; default 38400 8O1; unit ID 1; FC 01,03,05,06,16; Port 1 (RS-232) has fixed settings (38400 bps, Odd parity, 1 stop bit, Address 1, Modbus RTU slave only). Port 2 (RS-232) and Port 3 (RS-485) have configurable settings with default baud 38400, default parity Odd, default stop bit 1, default address 1. Port 1 (Ethernet) supports Modbus TCP.

bench facts as documented (unverified)

terminals	Port 3: 3-pin terminal block (+, -, LG). Port 1 & 2: 6-pin RJ12. Port 1 (Ethernet): 8-pin RJ45.
A/B polarity	Port 3 RS-485: Pin 1 is + (Plus) Signal A, Pin 2 is - (Minus) Signal B.
termination	Add a termination resistor between the + and - terminals on Port 3 and on the last device. Resistance needs to match the impedance of the communication cable.
connector	6-pin RJ12, 3-pin Terminal Block, 8-pin RJ45
isolation	Non-isolated (Port 1 RS-232C, Port 2 RS-232C, Port 3 RS-485)
shield/ground	Port 3 Pin 3: LG Logic Ground (0 V)
wiring notes	RS-232 ports can provide 5VDC to power one monochrome Micro-Graphic panel.
broadcast	supported
protocol notes	Ethernet Port 1 can communicate with up to 4 servers (slaves) and up to 3 clients (masters) simultaneously. Use a repeater if connecting more than 32 slaves to Port 3.
identification notes	Modbus addresses can be verified using the Address Picker in the CLICK programming software.
power	RS-232 ports can provide 5VDC power for one monochrome C-more Micro-Graphic panel.
doc revision	6th Edition, Rev. Q – C0-USER-M

generated by gemini:gemini-3.5-flash · harvested from https://cdn.automationdirect.com/static/manuals/c0userm/ch4.pdf (AutomationDirect); manual-faithful — the document's claims, panel risk: LOW — panel concurs, no field disagreements; proved interop-verified on 2026-06-10 · recorded 2026-06-10

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.

Have a device that isn't here? Upload its register map — generation is free, and the connector earns its rung by being proven, not claimed.

Need it proven on your own device? Hardware verification — if it doesn't verify, you don't pay.

Building a platform? License the verified library — machine-readable maps, firmware matrix, API access.