FIX Tag | Field Name | Req | Data Type | Description | Supporting Values
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8 | BeginString | Y | String | Identifies beginning of new message and protocol version.
Always unencrypted, must be first field in message. | FIX.4.4 |
9 | BodyLength | Y | Length | Message length, in bytes, forward to the CheckSum field.
Always unencrypted, must be second field in message. |
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35 | MsgType | Y | String | Defines message type.
Always unencrypted, must be third field in message. |
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49 | SenderCompID | Y | String | Assigned value as defined by CME Group used to identify firm sending message.
Always unencrypted. |
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50 | SenderSubID | N | String | Optional Client Assigned value used to identify specific message originator (user) within a firm. If populated in Logon message, same value must be populated in subsequent messages from client to CME STP. CME STP will populate this value in 57-TargetSubID on messages routed to the client. |
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56 | TargetCompID | Y | String | Assigned value used to identify receiving firm. Format: ‘CMESTPFIX#’ The value will be incremented for each new user at the Firm, e.g., CMESTPFIX1, CMESTPFIX2, CMESTPFIX3, etc. Always unencrypted. |
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57 | TargetSubID | | String | If populated in Logon message, Only acceptable value is "STP" and same value need to be populated in subsequent messages from client to CME STP.
CME STP will populate this value in 50-SenderSubID on messages routed to the client. Always unencrypted. |
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34 | MsgSeqNum | Y | SeqNum | Integer message sequence number. |
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43 | PossDupFlag | N | Boolean | Indicates possible retransmission of message with this sequence number. Required for retransmitted messages. | ‘Y’ (Possible duplicate) 'N' (Original transmission) |
97 | PossResend | N | Boolean | Indicates that message may contain information that has been sent under another sequence number. | ‘Y’ (Possible resend)
‘N’ (Original transmission) |
52 | SendingTime | Y | UTCTimestamp | Time of message transmission (expressed in UTC). YYYYMMDD-HH:MM:SS.sss
Can be embedded within encrypted data section. UTC Timestamps are sent in number of nanoseconds since Unix epoch synced to a master clock to microsecond accuracy. |
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122 | OrigSendingTime | N | UTCTimestamp | Original time of message transmission when transmitting messages as the result of resend request (expressed in UTC). UTC Timestamps are sent in number of nanoseconds since Unix epoch synced to a master clock to microsecond accuracy. Required for message resent as a result of a resend request. |
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