This document is the technical manual of Siemens FDUL221 line tester, which introduces the features and functions of this product.
This Technical Manual covers all necessary information for using the FDUL221 line tester, including menu navigation, connection methods, firmware updates, and troubleshooting procedures. It is intended for project managers, engineers, installation and commissioning personnel, and maintenance staff.
Three hardware variants are described – RS232, MC‑link (3.5 mm socket), and USB – each with its own interface and part number. The document also lists battery requirements, safety information, and environmental disposal guidelines.
| Interface (Variant 1) | RS232 |
|---|---|
| Interface (Variant 2) | MC link (3.5 mm socket) |
| Interface (Variant 3) | USB |
| Battery type | 9 V lithium manganese dioxide |
The FDUL221 is available in three variants: Variant 1 with an RS232 interface, Variant 2 with an MC‑link (3.5 mm socket), and Variant 3 with an integrated USB interface.
It is powered by a 9 V lithium manganese dioxide battery.
The manual is aimed at project managers, project engineers, installation personnel, commissioning personnel, and maintenance personnel.