User Help System
Detect a Gap
This test verifies that the client system can detect a gap and submit a Resend Request.
- Select a SenderComp / API ID from the drop-down and select ASSIGN if not already assigned.
- (If applicable) From the Instrument(s) drop-down, select the desired instrument if the instrument is not already locked.
- Select the START TEST button.
Note: DO NOT select the START TEST button once the test is in progress.
Note: If a test is not proceeding to the next step, clicking the Refresh button (
) below the test steps may resolve the issue.
- To run a Detect a Gap test:
- Submit a Logon (35=A).
- Receive a Logon Acknowledgment (35=A).
- Submit a Trade Capture Report Request (35=AD and 263=1).
- Receive a Heartbeat (35=0) and detect a gap.
- Submit a Resend Request (35=2).
- Receive a missed business message.
- Submit a Heartbeat (35=0).
- Receive a Heartbeat (35=0).
- Submit proper Heartbeat (35=0) in response.


