List of Communications Errors

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From time to time you may experience errors when trying to communicate to a panel using DLS IV. The following is a list of common errors and their causes and solutions.

PSTN Specific Errors

  • PSTN: Connection Broken Before Completion: This error is caused by the panel or modem being disconnected from the phone line while DLS IV is in the process of communicating. Make sure all connections are secure.


  • PSTN: Dialing [phone number] on modem 1 received busy signal: You will see this error if the modem successfully dialed the phone number but received a busy signal. Ensure that the phone line the panel is connected to is not in use.


  • PSTN: Disconnected from 102:


  • PSTN: No dial tone detected on modem 1:


  • PSTN: The modem 0 is not responding:


  • PSTN: The panel did not answer phone number 55:


  • There are no modems available:


  • Timeout while waiting for panel to call back:


  • Your telephone number contains invalid characters. Valid characters are 0-9,#,*,W and comma.:


IP Specific Errors

SMS Specific Errors

Miscellaneous Errors