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FA C++ supports custom symbols instead of SOH on per session basis. For that, the TagsDelimiter session property parameter is used.


The default delimiter is 'SOH'SOH.

The TagsDelimiter parameter is configured through SessionExtraParameters and through the file. If parameter is set through a configuration file, either symbols ("S", "|", "^", etc.) or Hex code (0x24, 0x7C, 0x5E, etc.) are applicable. 

In order to use the tagsDelimiter parameter for an acceptor, you should set a value for the default session in the config file: Session.Default.TagsDelimiter.


The session always uses the tags delimiter from the default session for the very first messages during connection establishing (sending a logon, sending a confirm logon, and receiving an answer with a logon or a logout). You can call the Session::isInEstablishingConnectionMode method to get the current mode and the Session::getCurrentTagsDelimiter method to get the currently used delimiter.

The tagsDelimiter is added as an argument in the following methods:

  • StorageMgr::create
  • FIXMessage::toString
  • FIXMessage::::toRaw
  • FIXMessage::prepare
  • FIXMsgProcessor::parse
  • FIXMsgProcessor::check
  • FIXMsgProcessor::checkFields
  • GenericPreparedMessage::GenericPreparedMessage (constructor)

As an option, you can call the static FAProperties::checkTagsDelimiterValue function.

Table of Contents

Allowed Parameter Values