Differences

This shows you the differences between two versions of the page.

--- developers:fixapi:standardheader [2025/09/12 01:39] – ↷ Page moved and renamed from developers:fixapi.standardheader to developers:fixapi:standardheader chad
+++ developers:fixapi:standardheader [2025/09/17 01:17] (current) – chad
@@ Line 1: / Line 1: @@
-====== Standard Header ======
+====== STANDARD HEADER ======
-All messages (administrative or application) are preceded by a Standard Header. In addition to providing the identification of FIX Session participants, the Standard Header identifies the Message Type (**Tag 35**), Message Length (**Tag 9**), Origination times (**Tag 52** and **Tag 122**) and Message Sequence order (**Tag 34**). The Standard Header also offers additional information on FIX Session authentication, resent messages, duplicated messages, and message routing and delivery.
+The Standard Header precedes all FIX messages and provides session identification, message routing, and sequencing information.
-===== Standard Header Dictionary =====
+===== Core Components =====
-^ Tag  ^ Field Name           ^ Req'd ^ Comments                                                                                 |
+  * **Message Identity:** BeginString (8), MsgType (35), BodyLength (9)
-| 8    | BeginString          | Y     | FIX.4.2                                                                                   |
+  * **Session Identity:** SenderCompID (49), TargetCompID (56)
-| 9    | BodyLength           | Y     | Length of Current Message                                                                |
+  * **Sequencing:** MsgSeqNum (34), SendingTime (52)
-| 35   | MsgType              | Y     | Message Type                                                                             |
+  * **Authentication:** SecureData (91), SecureDataLen (90) - Logon only
-| 49   | SenderCompID         | Y     | T4 Firm Name (outbound from FIX API server). T4 Application Name (inbound into FIX API server). |
-| 56   | TargetCompID         | Y     | T4 Application Name (outbound from FIX API server). T4 Firm Name (inbound into FIX API server). |
-| 90   | SecureDataLen        | N     | Length of SecureData (Tag 91) field. Used only in Login Message.                         |
-| 91   | SecureData           | N     | T4 application license code. Used only in Login Message.                                |
-| 34   | MsgSeqNum            | Y     | Sequence number of current message                                                      |
-| 50   | SenderSubID          | N     | T4 User/Trader Name. Message originator. Conditionally required for non-administrative messages when in Multi-Trader mode. |
-| 57   | TargetSubID          | N     | T4 User/Trader Name. Message originator.                                               |
-| 43   | PossDupFlag          | N     | "Y(es)" or "N(o)" Flag that indicates possible retransmission of message with this sequence number |
-| 97   | PossResend           | N     | "Y(es)" or "N(o)" Flag that indicates that the current message may contain information that has been sent under another sequence number |
-| 52   | SendingTime          | Y     | Time of message transmission - This is the UTC time the message is built within the CTS FIX API server. |
-| 122  | OrigSendingTime      | N     | Original time of message transmission when transmitting orders as the result of a Resend Request - expressed in UTC (Universal Time Coordinated) |
-| 369  | LastMsgSeqNumProcessed | N   | The last Sequence Number (Tag 34) value received by the T4 FIX API                      |
+===== Message Specification =====
-[[developers:legacy_fix_api|T4 FIX API Home]]
+**Required in all messages**
+^ Tag ^ Field Name ^ Type ^ Req'd ^ Description ^
+| 8 | BeginString | String | Y | Always "FIX.4.2" |
+| 9 | BodyLength | Int | Y | Message length (excluding 8, 9, 10) |
+| 35 | MsgType | String | Y | Message type identifier |
+| 34 | MsgSeqNum | Int | Y | Message sequence number |
+| 49 | SenderCompID | String | Y | Sender identifier |
+| 56 | TargetCompID | String | Y | Target identifier |
+| 52 | SendingTime | UTCTimestamp | Y | Message transmission time |
+| 43 | PossDupFlag | Boolean | O | Y=Possible duplicate |
+| 97 | PossResend | Boolean | O | Y=Possible resend |
+| 50 | SenderSubID | String | C | Trader name (Multi-Trader mode) |
+| 57 | TargetSubID | String | O | Target trader name |
+| 122 | OrigSendingTime | UTCTimestamp | C | Original time (resends only) |
+| 369 | LastMsgSeqNumProcessed | Int | O | Last received sequence |
+| 90 | SecureDataLen | Int | C | License code length (Logon only) |
+| 91 | SecureData | String | C | License code (Logon only) |
+===== Direction Rules =====
+**Inbound (Client → T4):**
+  * SenderCompID (49) = T4 Application Name
+  * TargetCompID (56) = T4 Firm Name
+**Outbound (T4 → Client):**
+  * SenderCompID (49) = T4 Firm Name
+  * TargetCompID (56) = T4 Application Name
+===== Notes =====
+  * First three tags must be: 8, 9, 35
+  * Multi-Trader mode requires SenderSubID (50) for order messages
+  * SecureData/SecureDataLen used only in Logon
+  * Times in UTC format: YYYYMMDD-HH:MM:SS.sss