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(first use Matt's high-level utility to generate two event codes that run at 10Hz and 100Hz (periods 91000 and 9100 respectively)

(ps-4.5.26) drp-srcf-mon001:psana$ periodicgenerator -p 91000 9100 -s 0 0 -d '10Hz' '100Hz' >& 10hz_100hz.py

(now program sequence engine 0 and start it using the python code generated above. since we're programming engine 0, the first two event codes will be 272,273 according to the above table)

(this command must be executed on a node that can access the XPM PV's, e.g. drp-srcf-*)

(ps-4.5.26) drp-srcf-mon001:psana$ seqprogram --seq 0:10hz_100hz.py --pv DAQ:NEH:XPM:3 --start
** engine 0 fname 10hz_100hz.py **
descset  None
seqcodes {0: '10Hz', 1: '100Hz'}
Remove -1
idx 2
Removing seq 2
[10, 1, 5, 3, 0, 0, 0, 0, 2, 0, 6, 2048, 0, 0, 0, 3, 2, 1, 3, 3, 0, 0, 2, 0, 6, 908, 0, 0, 0, 1, 5, 2, 0, 0, 0, 0, 3, 2, 1, 0, 8, 0, 0, 2, 0, 6, 2048, 0, 0, 0, 3, 2, 6, 3, 3, 0, 0, 2, 0, 6, 908, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0]
Confirmed ninstr 10
Sequence  found at index 2
desc ['10Hz', '100Hz', '', '', '', '', '', '', '', '', '', '', 'burst', '', '', '']
seqcodes_pv epics:nt/NTTable:1.0 
    string[] labels [EventCode, Description, Rate, Enabled]
    structure value
        int[] EventCode [272,273,274,275,276,277,278,279,280,281,282,283,284,285,286,287]
        string[] Description [10Hz, 100Hz, , , , , , , , , , , burst, , , ]
        int[] Rate [11,102,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
        byte[] Enabled [1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1]
    string descriptor 
    alarm_t alarm
        int severity 0
        int status 0
        string message 
    time_t timeStamp
        long secondsPastEpoch 1683163040
        int nanoseconds 339389440
        int userTag 0

(now query the xpm to see what is running in the 4 sequence engines, each having 4 event codes)

(ps-4.5.26) drp-srcf-mon001:psana$ pvget DAQ:NEH:XPM:3:SEQCODES
DAQ:NEH:XPM:3:SEQCODES 2023-05-03 18:17:31.339    
EventCode Description Rate Enabled
      272        10Hz   10       1
      273       100Hz  102       1
      274                0       1
      275                0       1
      276                0       0
      277                0       0
      278                0       0
      279                0       0
      280                0       0
      281                0       0
      282                0       0
      283                0       0
      284       burst    0       1
      285                0       1
      286                0       1
      287                0       1
(ps-4.5.26) drp-srcf-mon001:psana$ 

Note: the periodicgenerator "repeat" argument specifies the number of repeats of the slowest event-code.

There is a similar "traingenerator" script which you can read about in Matt's documentation.

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Some technical details from a discussion on March 23, 2023

currently start the XPM starts sequences on 1Hz boundary (e.g. every 910000 buckets). this slows down the daq scan steps, so support for a second mode is being considered:

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