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Logon (A)

On this page

Purpose

Used to establish a connection between a TT FIX Gateway and a third-party FIX acceptor

Message Direction

From TT FIX Gateways to a third-party FIX acceptor and then from a third-party FIX acceptor to TT FIX Gateways

Tag Directory

Click the links below to navigate to the documentation for that tag.

8910343543495256969798108115122128141354355
Logon
TagNameTypeRequiredComments
Y

For additional information about this component group, consult the documentation.

35=A (MsgType)

8BeginStringSTRINGY

FIX protocol version

The tag indicates the beginning of a new message.

This tag must be the first tag in the message.

You must set the value to FIX4.2.

8BeginStringSTRINGY

FIX protocol version

The tag indicates the beginning of a new message.

This tag must be the first tag in the message.

You must set the value to FIX.4.2 or FIX.4.4.

9BodyLengthINTY

Message length (in characters)

The value represents number of characters in the message following
this tag up to, and including, the delimiter immediately preceding Tag
10 (CheckSum). This tag must be the second field in a message.

9BodyLengthINTY

Message length (in characters)

The value represents number of characters in the message following
this tag up to, and including, the delimiter immediately preceding Tag
10 (CheckSum). This tag must be the second field in a message.

35MsgTypeSTRINGY

Type of message contained in the message body

This tag must appear third in the list of header tags.

Possible values:
  • 0: Heartbeat
  • 1: Test Request
  • 2: Resend Request
  • 3: Reject
  • 4: Sequence Reset
  • 5: Logout
  • 8: Execution Report
  • 9: Order Cancel Reject
  • A: Logon
  • B: News
  • c: Security Definition Request
  • D: Order Single
  • d: Security Definition
  • e: Security Status Request
  • f: Security Status
  • F: Order Cancel Request
  • G: Order Cancel Replace Request
  • H: Order Status Request
  • Q: Don’t Know Trade (Inbound Drop Copy only)
  • R: Quote Request
  • V: Market Data Request
  • W: Market Data Snapshot Full Refresh
  • X: Market Data Incremental Refresh
  • Y: Market Data Request Reject
  • AD: Trade Capture Report Request
  • AE: Trade Capture Report
  • AQ: Trade Capture Report Request Ack
35MsgTypeSTRINGY

Type of message contained in the message body

This tag must appear third in the list of header tags.

Possible values:
  • 0: Heartbeat
  • 1: Test Request
  • 2: Resend Request
  • 3: Reject
  • 4: Sequence Reset
  • 5: Logout
  • 8: Execution Report
  • 9: Order Cancel Reject
  • A: Logon
  • B: News
  • c: Security Definition Request
  • D: Order Single
  • d: Security Definition
  • e: Security Status Request
  • f: Security Status
  • F: Order Cancel Request
  • G: Order Cancel Replace Request
  • H: Order Status Request
  • Q: Don’t Know Trade (Inbound Drop Copy only)
  • R: Quote Request
  • V: Market Data Request
  • W: Market Data Snapshot Full Refresh
  • X: Market Data Incremental Refresh
  • Y: Market Data Request Reject
  • AD: Trade Capture Report Request
  • AE: Trade Capture Report
  • AQ: Trade Capture Report Request Ack
49SenderCompIDSTRINGY

Assigned value used to identify TT

49SenderCompIDSTRINGY

Assigned value used to identify the counterparty

56TargetCompIDSTRINGY

Assigned value used to identify the counterparty

56TargetCompIDSTRINGY

Assigned value used to identify TT

34MsgSeqNumSEQNUMY

Message sequence number

34MsgSeqNumSEQNUMY

Message sequence number

43PossDupFlagBOOLEANC

Sent when a TT FIX Gateway resends messages

Whether the sequence number for this message is already used

Possible values:
  • N: NO: Original transmission
  • Y: YES: Possible duplicate
43PossDupFlagBOOLEANC

Must be sent when a third-party FIX acceptor resends messages

Whether the sequence number for this message is already used

Possible values:
  • N: NO: Original transmission
  • Y: YES: Possible duplicate
97PossResendBOOLEANC

Must be sent if the message may contain information that has been sent under another sequence number.

Whether the message might contain information that has been sent under another sequence number

Possible values:
  • N: NO: Original transmission
  • Y: YES: Possible resend
122OrigSendingTimeUTCTIMESTAMPC

Required for resent messages

Original time of message transmission, when transmitting orders as the result of a resend request

Always expressed in UTC.

122OrigSendingTimeUTCTIMESTAMPC

Sent when a third-party FIX acceptor resends a message

Original time of message transmission, when transmitting orders as the result of a resend request

Always expressed in UTC.

52SendingTimeUTCTIMESTAMPY

Time, in UTC, the message was sent.

52SendingTimeUTCTIMESTAMPY

Time, in UTC, the message was sent.

Y

For additional information about this component group, consult the documentation.

35=A (MsgType)

8BeginStringSTRINGY

FIX protocol version

The tag indicates the beginning of a new message.

This tag must be the first tag in the message.

You must set the value to FIX4.2.

8BeginStringSTRINGY

FIX protocol version

The tag indicates the beginning of a new message.

This tag must be the first tag in the message.

You must set the value to FIX.4.2 or FIX.4.4.

9BodyLengthINTY

Message length (in characters)

The value represents number of characters in the message following
this tag up to, and including, the delimiter immediately preceding Tag
10 (CheckSum). This tag must be the second field in a message.

9BodyLengthINTY

Message length (in characters)

The value represents number of characters in the message following
this tag up to, and including, the delimiter immediately preceding Tag
10 (CheckSum). This tag must be the second field in a message.

35MsgTypeSTRINGY

Type of message contained in the message body

This tag must appear third in the list of header tags.

Possible values:
  • 0: Heartbeat
  • 1: Test Request
  • 2: Resend Request
  • 3: Reject
  • 4: Sequence Reset
  • 5: Logout
  • 8: Execution Report
  • 9: Order Cancel Reject
  • A: Logon
  • B: News
  • c: Security Definition Request
  • D: Order Single
  • d: Security Definition
  • e: Security Status Request
  • f: Security Status
  • F: Order Cancel Request
  • G: Order Cancel Replace Request
  • H: Order Status Request
  • Q: Don’t Know Trade (Inbound Drop Copy only)
  • R: Quote Request
  • V: Market Data Request
  • W: Market Data Snapshot Full Refresh
  • X: Market Data Incremental Refresh
  • Y: Market Data Request Reject
  • AD: Trade Capture Report Request
  • AE: Trade Capture Report
  • AQ: Trade Capture Report Request Ack
35MsgTypeSTRINGY

Type of message contained in the message body

This tag must appear third in the list of header tags.

Possible values:
  • 0: Heartbeat
  • 1: Test Request
  • 2: Resend Request
  • 3: Reject
  • 4: Sequence Reset
  • 5: Logout
  • 8: Execution Report
  • 9: Order Cancel Reject
  • A: Logon
  • B: News
  • c: Security Definition Request
  • D: Order Single
  • d: Security Definition
  • e: Security Status Request
  • f: Security Status
  • F: Order Cancel Request
  • G: Order Cancel Replace Request
  • H: Order Status Request
  • Q: Don’t Know Trade (Inbound Drop Copy only)
  • R: Quote Request
  • V: Market Data Request
  • W: Market Data Snapshot Full Refresh
  • X: Market Data Incremental Refresh
  • Y: Market Data Request Reject
  • AD: Trade Capture Report Request
  • AE: Trade Capture Report
  • AQ: Trade Capture Report Request Ack
49SenderCompIDSTRINGY

Assigned value used to identify TT

49SenderCompIDSTRINGY

Assigned value used to identify the counterparty

56TargetCompIDSTRINGY

Assigned value used to identify the counterparty

56TargetCompIDSTRINGY

Assigned value used to identify TT

34MsgSeqNumSEQNUMY

Message sequence number

34MsgSeqNumSEQNUMY

Message sequence number

43PossDupFlagBOOLEANC

Sent when a TT FIX Gateway resends messages

Whether the sequence number for this message is already used

Possible values:
  • N: NO: Original transmission
  • Y: YES: Possible duplicate
43PossDupFlagBOOLEANC

Must be sent when a third-party FIX acceptor resends messages

Whether the sequence number for this message is already used

Possible values:
  • N: NO: Original transmission
  • Y: YES: Possible duplicate
97PossResendBOOLEANC

Must be sent if the message may contain information that has been sent under another sequence number.

Whether the message might contain information that has been sent under another sequence number

Possible values:
  • N: NO: Original transmission
  • Y: YES: Possible resend
122OrigSendingTimeUTCTIMESTAMPC

Required for resent messages

Original time of message transmission, when transmitting orders as the result of a resend request

Always expressed in UTC.

122OrigSendingTimeUTCTIMESTAMPC

Sent when a third-party FIX acceptor resends a message

Original time of message transmission, when transmitting orders as the result of a resend request

Always expressed in UTC.

52SendingTimeUTCTIMESTAMPY

Time, in UTC, the message was sent.

52SendingTimeUTCTIMESTAMPY

Time, in UTC, the message was sent.

96RawDataSTRINGC

Will be sent when the TT FIX Gateway initiates a connection. The third-party FIX acceptor need not send this in the response.

Logon password

96RawDataSTRINGC

Will be sent when the TT FIX Gateway initiates a connection. The third-party FIX acceptor need not send this in the response.

Logon password

98EncryptMethodINTY

Method of encryption

As TT FIX does not support encrypted logons, you must set the value to 0 (None/Other).

Possible values:
  • 0: NONE
98EncryptMethodINTY

Method of encryption

As TT FIX does not support encrypted logons, you must set the value to 0 (None/Other).

Possible values:
  • 0: NONE
108HeartBtIntINTY

Heartbeat interval (seconds)

108HeartBtIntINTY

Heartbeat interval (seconds)

141ResetSeqNumFlagBOOLEANN

Whether to reset the sequence numbers on both sides of the FIX session

Possible values:
  • N: NO (default)
  • Y: YES
141ResetSeqNumFlagBOOLEANN

Whether to reset the sequence numbers on both sides of the FIX session

Possible values:
  • N: NO (default)
  • Y: YES
115OnBehalfOfCompIDSTRINGN

Assigned value used to identify firm originating message if the message was delivered by a third party, i.e. the third party firm identifier would be delivered in the SenderCompID field and the firm originating the message in this field.

115OnBehalfOfCompIDSTRINGN

Assigned value used to identify firm originating message if the message was delivered by a third party, i.e. the third party firm identifier would be delivered in the SenderCompID field and the firm originating the message in this field.

128DeliverToCompIDSTRINGN

Assigned value used to identify the firm targeted to receive the message if the message is delivered by a third party, i.e. the third party firm identifier would be delivered in the TargetCompID (56) field and the ultimate receiver firm ID in this field.

128DeliverToCompIDSTRINGN

Assigned value used to identify the firm targeted to receive the message if the message is delivered by a third party, i.e. the third party firm identifier would be delivered in the TargetCompID (56) field and the ultimate receiver firm ID in this field.

354EncodedTextLenINTN

Byte length of encoded (non-ASCII characters) EncodedText (355) field.

354EncodedTextLenINTN

Byte length of encoded (non-ASCII characters) EncodedText (355) field.

355EncodedTextSTRINGN

Encoded (non-ASCII characters) representation of the Text (58) field in the encoded format specified via the MessageEncoding (347) field. If used, the ASCII (English) representation should also be specified in the Text (58) field.

Data length controlled by field EncodedTextLen(354)

355EncodedTextSTRINGN

Encoded (non-ASCII characters) representation of the Text (58) field in the encoded format specified via the MessageEncoding (347) field. If used, the ASCII (English) representation should also be specified in the Text (58) field.

Data length controlled by field EncodedTextLen(354)

Y

For additional information about this component group, consult the full documentation.

10CheckSumSTRINGY

Unencrypted three-character checksum

This tag must always be the last field in a message (i.e. it serves, with the trailing <SOH>, as the end-of-message delimiter).

10CheckSumSTRINGY

Unencrypted three-character checksum

This tag must always be the last field in a message (i.e. it serves, with the trailing <SOH>, as the end-of-message delimiter).

Y

For additional information about this component group, consult the full documentation.

10CheckSumSTRINGY

Unencrypted three-character checksum

This tag must always be the last field in a message (i.e. it serves, with the trailing <SOH>, as the end-of-message delimiter).

10CheckSumSTRINGY

Unencrypted three-character checksum

This tag must always be the last field in a message (i.e. it serves, with the trailing <SOH>, as the end-of-message delimiter).

Message Notes

The Logon (A) message is used by a TT FIX Gateway to begin a new or continue an existing session with a third-party FIX acceptor.

The following data flow illustrates a typical logon sequence between a TT FIX Gateway and a third-party FIX acceptor:

  1. The TT FIX Gateway opens a socket connection to the third-party FIX acceptor.
  2. The TT FIX Gateway sends a Logon (A) message to the third-party FIX acceptor.
  3. If the third-party FIX acceptor detects any errors, it will respond with a Logout (5) message with the reason for rejection in Tag 58 (Text), and closes the socket connection.
  4. The third-party FIX acceptor examines the value of Tag 141 (ResetSeqNumFlag).
    • If Tag 141 (ResetSeqNumFlag) is set to N, the third-party FIX acceptor compares the value of Tag 34 (MsgSeqNum) in the Logon (A) message against its current sequence number.
      • If MsgSeqNum is less than the expected sequence number, the third-party FIX acceptor stops processing the logon attempt, sends a Logout (5) message as its response, and closes the socket connection.
      • If MsgSeqNum is greater than sequence number the third-party FIX acceptor expected, the logon process continues normally. However, after the logon process completes, the third-party FIX acceptor sends a Resend Request (2) message.
    • If Tag 141 (ResetSeqNumFlag) is set to Y, the third-party FIX acceptor expects the value of Tag 34 (MsgSeqNum) in the Logon (A) message to be 1.
      • If Tag 34 is not 1, the third-party FIX acceptor stops processing the logon attempt, sends a Logout (5) message, and closes the connection.
      • Otherwise, the logon process continues normally.
  5. The third-party FIX acceptor sends a Logon (A) message to the TT FIX Gateway.

TT FIX Price Gateway

The TT FIX Price Gateway will only support non-persistent FIX sessions. In other words, it will always send a Logon (A) message with Tag 34 (MsgSeqNum)=1 and Tag 141 (ResetSeqNumFlag)=Y when initiating a connection. As a result, the FIX session will terminate when the connection does.

TT FIX Order Gateway

When the TT FIX Order Gateway is started for the first time, it will send a Logon (A) message with Tag 34 (MsgSeqNum)=1. When there are unscheduled restarts, the standard FIX message sequence number negotiation will take place. After scheduled message sequence number resets, the TT FIX Order Gateway will send a Logon (A) message with Tag 34 (MsgSeqNum)=1.

Related Information