UDS - Message Processing and Specifications
- Space Sync for Confluence
To create a UDS, a client systems must be able to process the following iLink 2 message types:
Message | Description |
|---|---|
Submitted to CME Globex by customer system to request | |
Sent to customer system by CME Globex upon acceptance or rejection | |
Sent by CME Globex to reject messages at the FIX session level |
The order entry iLink Security Definition (tag 35-MsgType=d) message and the market data Security Definition (tag 35-MsgType=d) message are distinctly different. CME Group recommends using the TCP order entry iLink Security Definition (tag 35-MsgType=d) as an acknowledgment and the market data Security Definition (tag 35-MsgType=d) REPLAY message as the instrument definition.
UDS Security Definition Request
CME Group customers use the iLink Security Definition Request (tag 35-MsgType=c) message to create a spread on the CME Globex platform. The iLink Security Definition Request message requires a repeating group of user-populated tags for instruments included in the spread.
CME Globex validates all required tags; the message is rejected if a required tag:
is not included
is empty
contains spaces
exceeds the character limit
If an iLink Security Definition Request (tag 35-MsgType=c) is rejected as "Contract is invalid" due to an existing, identical spread instrument definition sent in tag 107-SecurityDesc. It is strongly recommended that the client system reload all market data Security Definition (tag 35-MsgType=d) messages from the Replay channel.
UDS Security Definition
CME Globex sends the order entry iLink message in an acknowledgment response to a iLink message.
If the iLink Security Definition Request message is accepted, the CME Globex platform processes the combination in the iLink Security Definition Request message to generate a unique spread and sends an iLink Security Definition (tag 35-MsgType=d) message to the customer system with tag 323-SecurityResponseType = 2 (Accepted).
If the iLink Security Definition Request message is rejected, the iLink Security Definition message will contain tag 323-SecurityResponseType = 5 (Reject), tag 58-Text containing the reason for the reject, and tag 107-SecurityDesc containing the security description of the existing (identical) contract.
Only CME Globex unrecognized spreads have the repeating groups in the iLink Security Definition
(tag 35-MsgType=d) message returned in the same order as submitted in the iLink Security Definition Request (tag 35-MsgType=c) message.
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