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ErrorLib — Industrial Fault Code Library

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USD Comm

Universal Satellite Device Communication Loss

Otis · 400 Elevator

What does USD Comm mean?

Indicates that the Universal Satellite Device (DMC) is no longer online. This means communication between the main controller and the DMC is lost, impacting peripheral control and system functionality.

Common Causes

  • Loss of communication with the DMC-USD (Universal Satellite Device).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the presence and correct level of supply voltage at the Universal Satellite Device (DMC) power input terminals as per specifications.

  2. 2

    Inspect all communication cabling (e.g., CAN bus, Ethernet, serial) between the main controller and the Universal Satellite Device (DMC) for physical damage, proper routing, and secure connections.

  3. 3

    Check the status indicator LEDs on both the main controller's communication port and the Universal Satellite Device (DMC) for any error codes or communication activity.

  4. 4

    Verify the communication protocol settings, baud rate, and device addressing configuration for the Universal Satellite Device (DMC) in the main controller's programming interface against system documentation.

Browse all codes in this manual (41)
Verified technical data. Last updated: April 2026

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Source: Otis 400 Elevator
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