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WAVESHARE · PUBLIC DEVICE MAP

Modbus RTU IO 8CH register map

Official digital I/O and output-control-mode map for the Waveshare Modbus RTU IO 8CH RS485 module. Coils 0–7 control outputs, discrete inputs 0–7 report isolated inputs, and holding registers 0x1000–0x1007 expose output modes.

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MAP OVERVIEW

4 groups, 26 decoded points.

01Digital outputs8 tags02Digital inputs8 tags03Output control modes8 tags04Device information2 tags
REGISTER MAP

Searchable source data.

Documentation addresses are derived from the zero-based PDU address in the public definition. Convert a documentation address to its PDU offset when comparing with the manual. Confirm the map against revision Development Protocol V2 and the installed device before commissioning.

Digital outputs

8 of 8
Signal / registerDoc addressPDUTypeUnitNotes
Output 1000010–0boolean—Read with FC01; control with FC05 or FC15.
Output 2000021–1boolean—Read with FC01; control with FC05 or FC15.
Output 3000032–2boolean—Read with FC01; control with FC05 or FC15.
Output 4000043–3boolean—Read with FC01; control with FC05 or FC15.
Output 5000054–4boolean—Read with FC01; control with FC05 or FC15.
Output 6000065–5boolean—Read with FC01; control with FC05 or FC15.
Output 7000076–6boolean—Read with FC01; control with FC05 or FC15.
Output 8000087–7boolean—Read with FC01; control with FC05 or FC15.

Digital inputs

8 of 8
Signal / registerDoc addressPDUTypeUnitNotes
Input 1100010–0boolean—Isolated digital input status read with FC02.
Input 2100021–1boolean—Isolated digital input status read with FC02.
Input 3100032–2boolean—Isolated digital input status read with FC02.
Input 4100043–3boolean—Isolated digital input status read with FC02.
Input 5100054–4boolean—Isolated digital input status read with FC02.
Input 6100065–5boolean—Isolated digital input status read with FC02.
Input 7100076–6boolean—Isolated digital input status read with FC02.
Input 8100087–7boolean—Isolated digital input status read with FC02.

Output control modes

8 of 8
Signal / registerDoc addressPDUTypeUnitNotes
Output 1 control mode440974096–4096uint16—Output channel 1 operating mode.
Output 2 control mode440984097–4097uint16—Output channel 2 operating mode.
Output 3 control mode440994098–4098uint16—Output channel 3 operating mode.
Output 4 control mode441004099–4099uint16—Output channel 4 operating mode.
Output 5 control mode441014100–4100uint16—Output channel 5 operating mode.
Output 6 control mode441024101–4101uint16—Output channel 6 operating mode.
Output 7 control mode441034102–4102uint16—Output channel 7 operating mode.
Output 8 control mode441044103–4103uint16—Output channel 8 operating mode.

Device information

2 of 2
Signal / registerDoc addressPDUTypeUnitNotes
Device address5638516384–16384uint16—Configured Modbus device address.
Software version7276932768–32768uint16—Raw integer scaled by 0.01; 100 represents version 1.00.
SOURCE & SCOPE

Import the map, then verify the device.

The catalogue provides register metadata, not a connection profile. Serial port, Unit ID, baud rate and site-specific naming stay in your Busloom project.

Manufacturer protocol document ↗Import and verify this register mapCheck RS-485 wiring and framingPlan writes and verify the result