PITCH 2.X Messages

    0xB1        Time Reference    
    0x20        Time
    0x97        Unit Clear
    0xBC        Transaction Begin
    0xBD        Transaction End
    0x21        Add Order - Long
    0x22        Add Order - Short
    0x2F        Add Order - Expanded
    0x23        Order Executed
    0x24        Order Executed at Price/Size
    0x25        Reduce Size - Long
    0x26        Reduce Size - Short
    0x27        Modify Order - Long
    0x28        Modify Order - Short
    0x29        Delete Order
    0x2A        Trade - Long
    0x2B        Trade - Short
    0x30        Trade - Expanded 
    0x2C        Trade Break
    0x2D        End of Session
    0x2E        Symbol Mapping
    0x31        Trading Status
    0xD2        Width Update
    0x95        Auction Update
    0xD1        Options Auction Update
    0x96        Auction Summary
    0xAD        Auction Notification
    0xAE        Auction Cancel
    0xAF        Auction Trade
    0x98        Retail Price Improvement
    0x9D        SOQ Strike Range Update
    0x9E        Constituent Symbol Mapping