RelayFax online help

Modem Properties - Modem Profile

Navigation:  RelayFax's Main Display > Modem Properties >

Modem Profile

Print this Topic Previous pageReturn to chapter overviewNext page


This is your fax device's profile. Choosing a different profile from the drop-down list may change the rest of the settings on this dialog. If the rest of the settings are dimmed or unavailable and you wish to edit them, click the New button to copy the settings to a new profile that you can edit.


This control specifies the EIA modem standard that the device supports.

Modem INIT String...

Your modem's initialization string is specified here. Normally, this string is detected when the fax device is queried by RelayFax. Changing your fax device's profile may also alter the INIT string.

Although RelayFax will allow you to edit the INIT value, do so with caution. Improper changes to modem INIT strings can cause your modem to stop working properly. See your modem documentation for more information on initialization strings.

COM Port Baud Rate

This is the maximum rate in bits per second (bps) that RelayFax may communicate with the fax device. This is not the rate at which the fax device communicates with other fax devices. That rate is specified on the Options pane.

Byte Size

This is the number of data bits used for each character that is transmitted and received by the modem. This setting must match the same setting in the modem with which you are communicating. Most fax devices use a value of 8, so you should not change it to another value unless you are certain it's necessary.


Parity is a method of error correction. With parity correction enabled, an extra bit is transmitted with each character in order to make the number of bits sent either Odd or Even. There are also Mark and Space settings, which cause the parity bit to be either always set or always cleared, respectively. Both modems, whether sending or receiving, must have the same parity setting—it should typically be set to None because most connections use more sophisticated methods of error correction.

Stop Bits

This is the number of stop bits sent to indicate the end of each transmitted character. This is typically set to "1."

Flow Control

Flow Control is a method for compensating for the difference between the speed at which data reaches a device and the speed at which that device can process and transmit it. Because data might be sent faster than it can be processed, flow control can help prevent data from being lost by telling the sending device to pause while it catches up.

Software (XON/XOFF)

Click to enable this software-based method of flow control. This method transmits standard ASCII characters to pause and resume the flow of data. This software-based method is typically inferior to hardware flow control, but not all fax devices are equipped with a hardware-based method.

Hardware (DSR)

Click to enable DSR (Data Set Ready), a hardware-based method of flow control.

Hardware (CTS)

Click to enable CTS (Clear to Send), a hardware-based method of flow control.

Creating/Deleting Profiles


If the settings on this pane are dimmed or unavailable and you wish to edit them, click New to copy the settings to a new profile that you can edit. After clicking New, designate a name for the new profile and click OK.


If the displayed profile is one that you have created, clicking this button will delete it and return this pane to its default settings.



Relate Topics:
  Fax Device
  SIP Account