FIX Message Format Layout
The message fields are delimited using the ASCII 01
Up to FIX.4.4, the header contained three fields: 8 (BeginString), 9 (BodyLength), and 35 (MsgType) tags.
From FIXT.1.1 / FIX.5.0, the header contains five mandatory fields and one optional field: 8 (BeginString), 9 (BodyLength), 35 (MsgType), 49 (SenderCompID), 56 (TargetCompID) and 1128 (ApplVerID - if present must be in 6th position).
The body of the message is entirely dependent on the message type defined in the header (TAG 35, MsgType).
The last field of the message is TAG 10, FIX Message Checksum. It is always expressed as a three digit number (e.g. 10=002).
Header+Body+Trailer : FIX Content
Example of a FIX message : Execution Report (Pipe character is used to represent SOH character)
8=FIX.4.2 | 9=178 | 35=8 | 49=PHLX | 56=PERS | 52=20071123-05:30:00.000 | 11=ATOMNOCCC9990900 | 20=3 | 150=E | 39=E | 55=MSFT | 167=CS | 54=1 | 38=15 | 40=2 | 44=15 | 58=PHLX EQUITY TESTING | 59=0 | 47=C | 32=0 | 31=0 | 151=15 | 14=0 | 6=0 | 10=128 |
(In the above FIXMessage Body length 9 is correct and checksum 10 was checked out by using the source available from QuickFIX, an open source FIX implementation)
- Body
- Order / Trade Details Info
- Trailer
- Security Check thru Signature and CheckSum.
Read more about this topic: Financial Information EXchange
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