Gateways & Modems

Gateways & Modems

Gateways and modems are communication components that provide access to field device data by converting protocols and creating practical connection points for configuration and monitoring tools. A modem is typically used for direct, point-to-point protocol conversion, while a gateway provides an access node into a networked fieldbus segment with added monitoring functionality.

A modem is commonly employed to bridge a device protocol to a laptop or handheld interface (for example, converting HART to USB, or enabling wireless access depending on the interface). This supports quick on-site access to parameters, diagnostics, and device identity information without changing the existing control wiring architecture.

Gateways extend the concept by enabling parallel access to networks so configuration software can communicate with devices while the network continues its normal operation. In addition to protocol conversion, gateways can provide device and network status views that are accessible through standard browser-based tools, simplifying distributed diagnostics.

Key benefits include faster commissioning, reduced time to establish a reliable connection to the instrument, and clearer status visibility across a segment. Diagnostic framing aligned to established conventions (such as NAMUR NE 107) supports consistent triage, especially in mixed-vendor networks.

Typical applications include fieldbus segment visibility, remote diagnostics for hard-to-reach instruments, and maintenance workflows that benefit from quick, repeatable connection methods. Selection is usually driven by the field protocol (HART/FF/PROFIBUS and others), required access mode (point-to-point vs. network), and whether status monitoring and browser-based remote maintenance are needed.

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