Logon StandardHeader Standard Header Y MsgType = A 98 EncryptMethod EncryptMethod Y (Always unencrypted) 108 HeartBtInt HeartBtInt Y 95 RawDataLength RawDataLength N Required for some authentication methods 96 RawData RawData N Required for some authentication methods 141 ResetSeqNumFlag ResetSeqNumFlag N Indicates both sides of a FIX session should reset sequence numbers 383 MaxMessageSize MaxMessageSize N Can be used to specify the maximum number of bytes supported for messages received 384 NoMsgTypes NoMsgTypes N Specifies the number of repeating MsgTypes specified 35 MsgType MsgType N Specifies a specific, supported MsgType. Required if NoMsgTypes is > 0. 385 MsgDirection MsgDirection N Indicates direction (send vs. receive) of a supported MsgType. Required if NoMsgTypes is > 0. StandardTrailer Standard Trailer Y