Main INDEX
Monthly INDEX
PREV
NEXT
User name R. Michaels
Log entry time 16:44:30 on February 6,2000
Entry number 32915
keyword=DAQ problems, possible solutions
There seems to have been at least two problems with DAQ:
1) ROC14 dies about once an hour. 2) The event recorder ER1
loses contact with runcontrol. Actually, it seems other things
can lose their connection.
Regarding ROC14, it seemed likely a hardware problem with
the cpu. This cpu was dying periodically for 6 months with the
frequency dramatically increased recently. So I swapped the cpu.
Another possible problem was that the hardware addresses for
the two network cards were identical; since our routing is now
done through one router this leads to network inefficiencies. (I admit
I don't really know...) So, we made these addresses different.
Tests at 2 kHz with loose scint trigger -- CODA works no worse
than before.
Regarding problem 2), ER1 etc becoming in state "disconnected".
It is almost a meaningless problem, i.e. data still comes in and is
written to disk. The main thing is to be careful how to end the run
and restart. The following procedure should work: 1) Ignore the
messages; 2) End the run when you wish; 3) Press "reset" button
in top left corner of runcontrol; 4) Press "configure" and select
your config (normally "twospect"); 5) Press "download" .
Then start the next run. Whew !!!
Another problem, it may be related to Calarco's troubles. I could
not start CODA with coda_er, coda_eb, and et_start in the background.
Totally don't understand why. But when I start them interactively in
the workspace "coda_er" it seems fine. After a "kcoda" you will
need to restart coda_er and coda_eb by repeating the last such command.
(Do a "history 10" to see the last command). You do not have to restart
"et_start", however. If these commands get lost, here they are for the
record:
1. ER1, type this:
coda_er -i -s tst1 -n ER1 -t ER -f /home/adev/scripts/bobfile.tcl
2. EB, type this:
coda_eb -i -s tst1 -n EB -t CDEB
3. ET system, do this:
rm /tmp/et_sys_tst1
et_start -n 1000 -s 20000