5.2.7.3 Event Broadcast [1204-23]
The Event Broadcast Module (RS-232) provides a BNC connection for an Event Trigger Input
and a RS-232 connector for an ASCII message output.
When the defined signal edge is detected on the Event Input BNC Connector, an ASCII mes
sage is created containing the current time.
ASCII messages are stored in a Message Buffer. The message buffer can store 512entries
before overflowing. Messages may be lost if the buffer overflows.
Messages can be output in one of two ways:
If the Mode is set to Broadcast, messages in the Message Buffer will be output imme
diately through the RS-232 Output port. If another event is captured while a message is
being sent, it will be queued in the buffer until the first message completes, then the next
message will be sent.
If the Mode is set to Request, messages in the Message Buffer are only sent when the
Request Character is received.
The output format used is selected among a small group of formats with the capability to output
data at 5ns resolution. Event Broadcast Output formats are detailed in "ASCIITime Code Data
Formats" on page497.
Event Broadcast [1204-23]: Specifications
Inputs/Outputs: (1) Event Trigger Input, (1) Event Broadcast Output
Signal Type and Connector:
Connector J1 – (RS-232 Output) RS-232 DB9F
Connector J2 – (Event Input) TTL BNC
Event Resolution: 5ns
Minimum Time Between Events: 20ns
Message Buffer Size: 512 messages
Ordering Information: 1204-23: Event Broadcast
Figure 5-59: Model 1204-23 option card rear plate
SecureSync User Reference Guide 479
APPENDIX
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