DMX-Controlled Relay Design

Thought for 1 min 11 sec

flux

Great—next is adding copper cutouts/keep‑outs (for isolation and the metal enclosure), then doing initial placement.

What the Flux docs say about copper cutouts “This tutorial will explain how to accomplish this in Flux.

There are two options for creating copper cutouts:

Keep Out Rule: can be applied to any object. Will keep copper fills (and any other object) away from the element that the rule is applied to.
Zones: is an object on its own. Can be placed on the design and configured to create a cutout on any layer.” Source

Do this now

Isolation barrier cutout
- Create a rectangular Zone (or apply a Keep Out rule) that runs between the mains section and the logic/DMX section on both layers. Keep all pours and traces out of this band, especially under U2.
Mounting hole and edge keep‑outs
- Add a copper cutout around each mounting hole (Hole1, Hole2, Hole3, Hole4) so fills don’t reach the metal standoffs.
- Add a narrow copper‑free band along the board edges in the mains area to avoid planes touching the metal enclosure.

Placement checklist (inputs on one side, outputs on the other)

Inputs side: place IECIn and DMXIn together.
Outputs side: place IECOut and DMXOut together.
Relay path: place K1 between IEC input Line and IEC output Line so the high‑current path is short and straight. Neutral can route directly input→output.
Isolated DMX: place U2 straddling the isolation band, with its DMX side facing the XLRs and logic side facing U1. Keep no copper under its isolation gap (use the cutout above).
Aux AC‑DC: keep U7 in the mains section, away from logic; route mains to it short and direct.
Coil driver and snubber: keep U4 close to the relay coil pins on [K1], and place the RC snubber across the relay contacts.
Termination and ESD: put SW1 and TVS1 right next to the XLR pins; keep the A/B pair tight and symmetrical.
Indicators: place LED1 (Relay ON) near the output side; LED2 (DMX present) near the DMX input.

Confirm after you:

Add the isolation and hole/edge cutouts, and
Rough‑place the parts per the checklist.

Then I’ll guide trace width targets for the mains path, final routing order, and a quick DMX termination/bias check before routing.

Ask about isolation zone sizing

Clarify cutout implementation

Request DMX termination guidance

Ask about mains trace widths

Ask about enclosure grounding

Flux stopped

U2 ~RE - R2 P1

U1 PA08 - ENC1 A

U2 Z - DMXIn 2

U1 PA08 - ENC1 A

U2 ~RE - R2 P1

U1 VDDIN - C5 P1

Y1 P2 - C15 P1

U6 IN - C11 P1

C15 P2 - GND GND

U1 ~RESETN - R1 P1

U1 VDDIN - C5 P1

IECIn L - L1 P1

U2 Y - DMXIn 3

U1 PA07 - ENC1 S1

U1 ~RESETN - R1 P1

U1 PA07 - ENC1 S1

U1 PA09 - ENC1 B

U2 Y - DMXIn 3

U2 Z - DMXIn 2

U2 DE - R3 P1

U1 VDDIN - C5 P1

U2 Y - DMXIn 3

U6 IN - C11 P1

Y1 P1 - C14 P1

U2 Z - DMXIn 2

U1 PA30 - LED1 A

U1 PA22 - U5 DIO

U1 VDDIN - C5 P1

U1 PA23 - U5 CLK

U1 VDDANA - C1 P1

U1 PA31 - LED2 A

U3 VIN+ - C7 P1

R1 P2 - R4 P2

U2 Z - DMXIn 2

U7 +Vo - C13 P1

C15 P2 - GND GND

U2 DE - R3 P1

U2 Y - DMXIn 3

U1 PA09 - ENC1 B

U2 Y - DMXIn 3

IECIn N - L2 P1

U1 VDDANA - C1 P1

GND

Resistance

10kΩ

Inductance

10 uH

ENC1

Resistance

10kΩ

Hole1

Capacitance

100 nF

IECOut

SW1

Not Recommended for New Designs

IECIn

DMXIn

DMXOut

TVS1

Reviews

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Project Name

DMX Relay

Description

Universal 100–240 VAC 15 A DMX/RDM Relay with Isolated RS‑485, Modular IEC60320/XLR3 I/O, Inrush/Surge Protection, and RDM-Configurable Addressing

Properties

OffDelay

200

Board Size

90.0 mm x 60.0 mm

OnDelay

100

System Architecture

Diagram

Pricing & Availability

Distributor	Qty 1
Arrow	$27.37–$36.58
Digi-Key	$87.08–$87.71
LCSC	$88.16–$101.33
Mouser	$100.30
TME	$60.57
Verical	$65.21–$126.77

Controls

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Schematic