Device Address DIP Switch

Question

Problem: Device Address DIP Switch. Solve this hands-on electronics task on EWskills.

Accepted Answer

1. Component Purpose

On an RS-485 bus, every device needs a unique address so the master can communicate with each one individually. A 4-position DIP switch lets the installer set this address manually using 4 binary switches (providing 2⁴ = 16 possible addresses).

Each switch position connects an MCU input to either HIGH or LOW. The MCU reads these 4 pins at startup to determine its bus address. This is a standard approach in industrial control equipment.

Required: SPST · 4 Positions · Slide Actuator · Raised · 2.54mm Pitch · Through Hole

2. How to Find It on DigiKey

Go to DigiKey.com → Switches → DIP Switches

Apply these filters:

Circuit → SPST
Number of Positions → 4
Actuator Type → Slide (Standard)
Actuator Level → Raised
Pitch → 0.100" (2.54mm)
Mounting Type → Through Hole
Part Status → Active

Tip: "Raised" actuator level means the switch toggles protrude above the body, making them easy to flip with a fingertip or small tool. "Flush" actuators sit level with the body and need a pointed tool.

3. Key Specifications & What They Mean

Specification	Required	Why
Circuit	SPST	Each position is a simple ON/OFF.
Positions	4	4-bit address = 16 possible addresses.
Actuator	Slide, Raised	Easy to toggle manually.
Pitch	2.54mm (0.100")	Standard through-hole IC/header pitch.
Current	≥50mA	Logic-level sensing; minimal current.
Voltage	≥24VDC	Margin for 3.3V/5V logic circuits.
Mounting	Through Hole, PC Pin	Standard DIP footprint on PCB.
Temp Range	−55°C to +85°C	Industrial operating conditions.

4. Selecting a Safe, Production-Ready Part

The filtered list will show matching parts. Before you pick one, check: Is it Active? Is stock available? Is the manufacturer reputable? Is a datasheet available?

Full checklist: How to Select a Safe, Production-Ready Component — EWskills Guide

5. Filtered DigiKey Link

➡ View Matching Parts — DIP Switch, 4-Position, SPST, Slide, 2.54mm, Through Hole

48. Device Address DIP Switch