Simple Cable
Build a 4-conductor cable between two Molex Microfit 4-pin connectors. This walkthrough covers the full Project Mode workflow: placing components, bulk connecting pins, defining signals, assigning parts, generating an assembly, adding a cable grouping with sync, and documenting a PCB header mate.
Setup
Layout View
The plan has two views of the same data. Layout shows a compact physical topology — components as blocks, conductors grouped into bundles. Schematic expands components to reveal individual pins and traces each conductor as a separate path. You can place components, make connections, and edit properties in either view. Start in Layout.
Open Panels
Open the left panel to see the project structure — Assemblies, Components, Branch Points, and Bundles. Open the right panel for Properties, Bulk Editor, Nets, and Parts tabs.
Add Components
Place First Component
Click + in the bottom toolbar to add a component. Select it and set the pin count to 4 in the Properties panel.
Configure via Bulk Editor
You can also set pin count via Bulk Editor > Components — useful when configuring multiple components at once.
Add Second Component
Add a second 4-pin component. Both represent Molex Microfit 4-pin connectors — parts will be assigned later.
Bulk Connect
Wire Pins with 1:1 Mapping
Right-click X1 and select Bulk Connect, then click X2 to set it as the target. The Bulk Connect dialog shows a grid of X1 pins against X2 pins. Set wire color and AWG, click 1:1 to map all pins straight through, then click Create Connections.
A bundle is created automatically since no path existed. All 4 conductors are created connecting X1 and X2.
Define Signals
Create Signals
Open Bulk Editor > Signals to create signals. Each signal can have a default color, AWG, stripe, and voltage. In this example we create four signals: 3V3 (red), GND (black), TX (blue), and RX (green).
Assign Signals to Nets
Open the Nets panel to assign signals to each net. A net represents the full electrical connection between endpoints — in this cable, each net spans from one X1 pin to the corresponding X2 pin. Assigning a signal to a net applies the signal’s color and properties to every conductor in that net, providing consistent color coding and classification across the plan.
Assign Parts to Components
Open the Parts tab, search for the Molex Microfit 4-pin connector, and assign it to both X1 and X2. The part number appears on the components in the canvas.
Generate Assembly
Select and Generate
Select both components and the bundle, then click Generate Assembly in the left panel. Name the assembly, confirm the selection, and click Generate. Splice converts your selection into a full harness schematic with connectors, conductors, and BOM entries. The assembly opens in Harness Builder, auto-arranged and ready for review.
Add Cable Grouping & Sync
Add Cable Grouping
Back in the plan, select the bundle and add a cable grouping in the Groupings section of the Properties panel. Search for and assign a cable part to the grouping via the Parts tab.
Sync to Assembly
Click the sync button next to the assembly in the left panel to push the cable change into the existing assembly. The assembly updates with the cable grouping and its BOM entry — no need to regenerate from scratch.
Add Device Group & Mate
Create Device Group
Add a new component and assign a PCB header part via the Parts tab. Right-click the component and select Add to Device Group to associate it with a physical device like a PCB. The component is now part of a Device Group, visually grouped on the canvas.
Define Mate Connection
Right-click the PCB header and select Mate, then click X1 to define the mating connection. The Mate documents how the PCB header and the cable connector physically and logically connect — which pins align, and how the connectors interface.