Report ID: NDDN-RST-2026-04 System Version: NDDN-W57 Date: April 18, 2026 Subject: Full system reset – causes, procedure, validation, and post-reset configuration 1. Executive Summary The NDDN-W57 unit requires a full reset to restore factory default parameters, clear non-volatile error logs, and reinitialize communication stacks. This report details the hardware and software reset mechanisms, step-by-step execution, safety considerations, and verification metrics. A reset is recommended only after troubleshooting confirms irrecoverable state (e.g., watchdog timeout, corrupted configuration CRC, or persistent fault code 0x57E3). 2. Equipment & Preconditions | Item | Specification | |------|----------------| | Model | NDDN-W57 | | Firmware minimum version for safe reset | v3.2.1 or later | | Power input | 24V DC ±10% (or as per device label) | | Backup battery (if present) | CR2032 (retains real-time clock) | | Required tool | Magnetic probe (for reed switch) or terminal access via RS-485/Modbus |
For NDDN-W57 hardware revision 2.3 and above. If your unit is older, contact support for legacy reset sequence (which uses a button instead of magnetic probe). nddn-w57 reset