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i4scada Knowledge Base

Fax Messaging Service Section


Open this article to learn all you need to know to configure the Fax Messaging Service for the i4scada MessengerPro.

The Fax Messaging Service section allows the user to configure the settings for sending fax alarm messages with Messenger or MessengerPro.


Fax Messaging Service Section

The options listed in the Fax Messaging Service section are split into three categories: General, Communication, and Format.

The settings will only be saved upon pressing the Save button.

General options

Fax Messaging General options

UI Option



Toggles the Fax messaging service on or off. If disabled, the Fax service won't be available in Messenger or MessengerPro.


The desired Fax Resolution:

  • Normal: usually 204×98 dpi or ppi;

  • Fine: usually 204×196 dpi or ppi

The resolution is used for sending faxes. If the receiver fax is unable to handle Fine resolution, it will automatically downgrade to Normal.

transmission error

The period of time (in minutes) to wait before sending again the alarm fax, if an error was encountered when sending it initially.

Lifetime for alarm message

The lifetime (in minutes) for alarm fax, in case of a persistent transmission error. The fax message will be deleted from the system after this time passes.

Communication options

The Communication options allow the user to choose and configure the Device settings for sending the alarm fax.


Fax Messaging Communication options

UI Option


Dial prefix

The prefix is required to be dialed in order to send the alarm fax if the receiver fax is using a different provider or needs a country/region prefix to be called.


If enabled, the receiver fax number will be dialed directly, without checking for dial tone.

Hardware interface

The hardware interface used for sending the alarm faxes. Can be:

  • CAPI (Common ISDN Application Programming Interface)

  • Modem


The period of time to wait before redialing, when the receiver fax cannot be reached.

CAPI hardware interface settings

CAPI hardware interface settings

UI Option


CAPI interface

The CAPI interface to be used, from 0 to 7. If you don't know which CAPI interface to select, please ask your hardware vendor/manufacturer.

If you have only one ISDN card installed, try the CAPI interface 0.

Modem settings

Modem settings

UI Option


COM port

The COM port used to access the modem.

Dial method

The dial method of the modem: Tone or Pulse.

The preferred dial method is Tone!

Transfer rate

The rate of transfer between the computer and the modem. Please read the modem documentation to find out the recommended transfer rate.

For newer modems, the MAX setting can be used.


If the modem requires additional AT (Hayes) initialization commands, they can be entered here.

The AT commands will be sent to the modem before a connection is established.

Format options

The Format options allow the configuration of the header and footer of the fax message.


Fax Messaging Format options

UI option



The fax header.


The fax footer.