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AVEVA Enterprise SCADA

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Modem Row Edit: Commands tab

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  • Last UpdatedApr 24, 2025
  • 3 minute read

Use the Commands tab in the modem Row Edit dialog box to configure the connect, disconnect and check commands for the modem. It is used for both dial and cryout.

  • Connect Commands. The fields in this area enable the connect configuration set, which allows you to configure commands for connecting a modem. This is used for dial and cry out To ensure that the modem is hung up before connection is attempted, the first connection string (for example, String to Be Sent) must always be the hang-up sequence (for example,, ATH\015\012\0). This ensures that the host-swapping of modems and service/system failovers work properly.

  • Disconnect Commands. The fields in this area enable the disconnect configuration set, which allows you to configure commands for disconnecting a modem. This is used for dial and cryout.

  • Check Commands. A no reply response is a loss of carrier or dial connection. The field in the check command-area enables the check configuration set, which is used when a no reply response is received from a remote. This is used for dial only. For more information on valid commands, refer to the modem’s command manual.

Refer to the table below for field descriptions and instructions on how to configure the editable fields.

Items on the Command Tab in the modem Row Edit Dialog Box

Items

Description

String to Be Sent

Enter the string to send to the modem. It contains characters such as: <CR> (\015), <LF>(\012) and the end-of-string indicator (\0).

Examples:

This command puts a Hayes-compatible modem in command mode: +++\0

This command tells a Hayes-compatible modem to hang up: ATH\015\012\0

Message OK String

(Optional) Enter the expected response from the modem.

Example: OK

OK is a normal response to many commands.

Format

Select one of the following formats:

  • Unused. This format indicates that the command is not sent. When a modem is being used, it starts at the first row and continues until it either arrives at an unused row (successfully) or until it fails to receive the desired response from a command (failure). This applies to the connect, disconnect and check configuration sets.

    Note: Setting the Format to Unused clears its rows and all the rows below it.

  • Command. This format indicates that no interpretation exists on the string.

  • Telno. This format expects the character "%s" in the string as placeholder for the telephone number (configured in the Connection Row Edit: Physical Connection Edit tab dialog box). This applies to the connect configuration set only.

  • Baud. This format expects the character "%s" as placeholder for the baud mapping value. This applies to the connect configuration set only.

  • Delay. This format ensures the subsequent format entry is not performed until a specified duration has elapsed after the previous one. This can be useful, for example, in accommodating modems that are slow to change from command mode to data mode. The delay is limited to 32 seconds.

    Note: Setting the Format to Delay clears the corresponding String to Be Sent and Message OK String fields.

Timeout

Enter the maximum time, in milliseconds, to wait for an expected response.

For a Telno format, this delay is added to the additional wait time for auto answer to give the overall delay time.

For a Delay format, the Timeout: column specifies the duration of the delay.

Typically, the Delay format is used after setting the connect configuration set’s Telno format and the check configuration set’s "ATO" string to 1 or 2 seconds.

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