Test independently
Build a mapping, load it onto a GRID45, and verify it works on your bench. No back-and-forth, no waiting.
New from Grid Connect — free
Prototype Modbus to EtherNet/IP mappings in two steps.
Protocol Mapper is a free, self-service tool for building and testing protocol mappings on real hardware. Configure, validate, and load a working prototype to a GRID45 from your bench — then work with Grid Connect on conformance testing when you're ready for production.
Two steps to a working mapping.
A guided interface designed around Modbus registers and EtherNet/IP assemblies — side-by-side. No hand-editing configuration files.
1
Configure
Set your Modbus RTU serial parameters and your EtherNet/IP presentation protocol settings on a single screen. Required fields are marked. Tooltip help is one click away on every label.
- Modbus RTU: baud rate, parity, stop bits, unit ID, timeouts
- EtherNet/IP: vendor ID, product name, product code, device type
- Click any field label or question-mark icon for hover-tip help
2
Map
Map Modbus registers to EtherNet/IP assemblies. Pick a register type, set a starting address and length, and assign to an assembly — by dropdown or by dragging between anchor points. Offsets, sizes, and overlap checks are handled for you.
- Holding Registers, Input Registers, Discrete Inputs, Coils In/Out
- Drag between anchor points or pick from a dropdown
- When the status reads Complete, you're ready to load
Catch mistakes before they reach the field.
Protocol Mapper validates as you build — so the configuration that leaves your bench is the one that runs on the device.
Live validation
Address-range checks as you map.
Mappings of the same operation and register type flag a conflict the moment their address ranges overlap. New mappings auto-calculate offsets. Total size adjusts in real time as you add registers.
“Mappings of the same operation and register type may conflict if the address ranges overlap.” — built-in validation explains exactly what's wrong.
Layout control
Reorder without rebuilding.
Pick up a mapping and drop it in a new offset position. Add and remove address gaps to customize how registers lay out across each EtherNet/IP assembly. The total size adjusts automatically.
Real hardware
Validate a prototype on a connected GRID45.
When the configuration reads Complete, click Load. Protocol Mapper scans the local network for a compatible device and pushes the configuration. Test the prototype on your bench — and share the loaded GRID45 with your customer for their own evaluation — without waiting on Grid Connect engineering to spin up a sample.
Prototype to production
Test the prototype, then take it to production with us.
Download or import the configuration files locally to share for evaluation. The mapping you build is a tested prototype — suitable for bench testing and customer review, but not production-ready on its own. When you're ready to move forward, hand the validated mapping to Grid Connect. We'll run conformance testing and deliver a custom part number with the production-ready configuration pre-loaded.
Your account, your work
Sync to the cloud, or stay local.
Sign in to save mappings to your account and pick up where you left off from any machine. Or skip the login and continue as a guest — guest configurations save in the browser they're created in.
Why teams choose Protocol Mapper.
Designed by the Grid Connect engineering team for the engineers and product managers building connected industrial products.
No more file-editing
Skip the configuration files. Work in a guided interface designed around Modbus registers and EtherNet/IP assemblies — side-by-side.
Validation as you build
Required fields, automatic offsets, and address-range checks catch mistakes before they ship.
A clear path to production
Once your prototype is validated, hand it to Grid Connect for conformance testing. We'll set up a custom part number with the production-ready configuration pre-loaded.
Cloud or local — your choice
Sign in to access your work from any machine, or stay offline. Guest mappings save in the browser they're created in.
Free, self-service, ready now
Available today as a desktop app for Mac, Windows, and Linux. No license, no setup hurdles.
What's supported today — and what's next.
Protocol Mapper is shipping with EtherNet/IP on the GRID45. More protocols and more hardware are on the way.
EtherNet/IP on the GRID45
Via the Protocol Mapper desktop app for Mac, Windows, and Linux.
Hosted web version
Same Protocol Mapper experience in the browser — no install required.
More protocols + hardware
Additional presentation protocols and additional Grid Connect hardware on the roadmap.
Start your first prototype.
Build a configuration, and validate it on a GRID45 today. When you're ready to move from prototype to production, hand the mapping to Grid Connect — we'll run conformance testing and deliver a custom part number with the configuration pre-loaded.
