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Overview

Data Format

At each trigger, the UDP Encoder sends one header structure followed by up to eight channel structures.

See the definitions of encoder_header_t and encoder_channel_t in github: UdpEncoder.hh

Configuring the Timing System

On a DAQ Partition

Matt Weaver writes
I just updated the 'tprtrig' application in the lcls2 repo.
You can get it to trigger the EVR on a DAQ partition like so:
    $ tprtrig -t a -c 0 -o 1 -d 2 -w 10 -p 4
programs EVR /dev/tpra (-t a) to generate a TTL trigger using logic channel 0 (-c 0) on output 0 (-o 1 [bit mask]) with delay of 2 119MHz clocks (-d 2) and width 10 119 MHz clocks (-w 10) for every L1Accept on partition 4 (-p 4). 

Standalone

Matt Weaver writes:
Generate 1Hz triggers on output 0 with a width of 54 nanoseconds.

    $ lcls2-git/psdaq/build/psdaq/app/tprtrig -t a -c 0 -o 1 -d 1 -w 10 -r 6

Testing

Monitoring UDP packets with netcat

-bash-4.2$ hostname
drp-neh-cmp011

-bash-4.2$ nc -lvu 192.168.0.8 5006
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Listening on 192.168.0.8:5006
Ncat: Connection from 192.168.0.3.
'plc-tst-proto6w?
                 ?bdSimEncoder
(plc-tst-proto6Q?
                 ?zdSimEncoder
)plc-tst-proto6+g
                 ??dSimEncoder
*plc-tst-proto6
               ??dSimEncoder
+plc-tst-proto6
               ??dSimEncoder^C
-bash-4.2$
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