MassCancelAcknowledgementUSOptionsV1 Message Fields
| Field Name | Offset | Length | Data Type | Description |
|---|---|---|---|---|
| StartOfMessage | 0 | 2 | Binary | 0xB0 0xE3 (58288) |
| MessageLength | 2 | 2 | Binary | |
| MessageType | 4 | 2 | Binary | 0x09DB (2523) |
| MatchingUnit | 6 | 1 | Binary | |
| Reserved | 7 | 1 | Binary | Value sent to member not specified |
| SequenceNumber | 8 | 4 | Binary | Zero - unsequenced application message |
| InFlight | 12 | 2 | Binary | |
| TransactionTime | 14 | 8 | DateTime | The time the event occurred in the Cboe Matching Engine (not the time the message was sent). |
| MassCancelID | 22 | 20 | Text | |
| CancelledOrderCount | 42 | 4 | Binary | |
| RequestReceivedTime | 46 | 8 | DateTime |