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AVEVA Enterprise SCADA

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Modem_test actions

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  • Last UpdatedApr 24, 2025
  • 1 minute read

Various modem states have different modem_test actions.

modem_test actions for various modem states

Modem States

modem_test Action

Result

  • Available

  • Out-of-service

modem-test places the modem in a test state, then attempts to dial using the given parameter.

  • Once the dial attempt has been performed, the modem record is updated with the succeed or fail time.

  • A failure from the available state causes the state to change to out-of-service.

  • Success from the out-of-service state causes the state to change to available.

  • Manual Disable

  • Disconnecting

  • Testing

  • Connecting

  • Connected

  • Any Other State

No action takes place.

The test process is invoked either automatically by the Jsh table, or manually from the ezXOS Modem Control dialog box. The entry in the Jsh table must contain all appropriate command-line arguments. The ezXOS command tied to the TEST button on the Modem Control dialog box uses the default local test phone number (t*), which detects either a no-dial tone or a busy signal on numerous telephone networks.

The process uses the following criteria to declare a modem either available or out-of-service:

  • The modem must establish a connection to the test modem or get a busy signal.

  • The modem must then be able to disconnect from the test modem to be declared available.

If either operation fails, the modem is declared out-of-service. This test proves that the dial-out modem’s phone line is functioning, the modem is accepting and responding to commands, and the modem is able to transmit and receive signals via the connect tones.