The selectPlatform CLI is effective only while the DAQ is in the Unallocated state.

Online help: selectPlatform -h 
$ selectPlatform -h
usage: selectPlatform [-h] [-p PLATFORM] [-C COLLECT_HOST] [-t TIMEOUT]
                      [-R READOUT_GROUP] [-s SELECT] [--select-all]
                      [-u UNSELECT]

optional arguments:
  -h, --help        show this help message and exit
  -p PLATFORM       platform (default 0)
  -C COLLECT_HOST   collection host (default localhost)
  -t TIMEOUT        timeout msec (default 2000)
  -R READOUT_GROUP  readout group (0-7, default platform)
  -s SELECT         select one alias (may be repeated)
  --select-all      select all
  -u UNSELECT       unselect one alias (may be repeated)

For multisegment detector, specify drp alias without _N suffix.
Demo: unselect teb1
$ procmgr restart lab3-caf-encoder.cnf 
/cds/home/c/caf/daq/v2/lcls2/install/bin/procmgr: using config file 'p1.cnf.running' to stop
/cds/home/c/caf/daq/v2/lcls2/install/bin/procmgr: removed 'p1.cnf.running'
/cds/home/c/caf/daq/v2/lcls2/install/bin/procmgr: using config file 'lab3-caf-encoder.cnf' to start

$ daqstate -p1 -C daq-tst-dev03 --transition rollcall -P tst

$ showPlatform -p1 -C daq-tst-dev03
Partition|         Node
id/name  | alias            level/pid/host (* = active)
---------+-----------------------------------------------------
1/tst      control          control/8672/daq-tst-dev03.pcdsn *
           encoder_0        drp/8677/daq-tst-dev03.pcdsn *
                             readout group: 1
           meb1             meb/8660/daq-tst-dev03.pcdsn
           teb1             teb/8665/daq-tst-dev03.pcdsn *

$ selectPlatform -p1 -C daq-tst-dev03 -u teb1

$ showPlatform -p1 -C daq-tst-dev03
Partition|         Node
id/name  | alias            level/pid/host (* = active)
---------+-----------------------------------------------------
1/tst      control          control/8672/daq-tst-dev03.pcdsn *
           encoder_0        drp/8677/daq-tst-dev03.pcdsn *
                             readout group: 1
           meb1             meb/8660/daq-tst-dev03.pcdsn
           teb1             teb/8665/daq-tst-dev03.pcdsn
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