Date: Mon, 4 Feb 2008 13:05:59 -0700
From: Dan Long
Subject: Re: Delayed Slew On 54498
Hi Kaike,
   Since the delay appeared to be between that one sop session and the
TCC and not between the TCC and mcp, I think the rebooting of the mcp
and the lack of delay since is probably just coincidence.
				Cheers,
				  Dan
>Just for your information. We did not see the delay during last two nights.
>Not sure if it contributed but we did rebooted MCP two nights ago.
>-kaike
>
>On Feb 4, 2008, at 11:11 AM, Dan Long wrote:
>
>>    Friday night's log mentioned a delay in slewing to the first
>>field of the night. By comparing the TCC and murmur logs, it looks
>>like the delay was between SOP and the TCC, as a gcam command and a
>>gotoField command issued 2 and 8 minutes earlier respectively both
>>show up at the TCC at the same time, 01:04:47Z.  It appears that
>>several commands from the sop session 14490 were queued up and not
>>seen by the TCC until 01:04:47Z (other connections were able to
>>issue TCC commands such as the test slew during this time).
>>
>>    Once the TCC got the command the mcp immediately started moving
>>the telescope, and the guider started taking exposures (which were
>>out of sync with the slew due to the delay).   Subsequent commands
>>showed no delay.  What follows is the sequence of events from the
>>murmur log and tcc log during that time.
>>
>>
>>23:49:44Z  Mur:  SOPGUI (IOP 14490) issues startDa -tcc
>>
>>00:57:21Z  Mur:  SOPGUI (IOP 14490) issues gcam 5.0 command
>>                  There is no evidence of the TCC receiving this command
>>                  until much later.
>>01:01:28Z  TCC:  Test slew to 60,60,60
>>01:01:28Z  Mur:  mcp starts moving telescope
>>01:02:08Z  Mur:  Last Fiducial Crossing of 60,60,60 test slew
>>01:02:16Z  TCC:  Test slew to 60,60,60 ends
>>01:03:00Z  Mur:  SOPGUI issues gotoField -gflat
>>01:03:22Z  Mur:  SOP sends track command
>>                  SOP sends commands to turn on FF lamp and close FF screens
>>01:04:15Z  Mur:  Setting binning for guider flat
>>01:04:45Z  Mur:  Turning off FF lamps
>>01:04:47Z  TCC:  gcam doread 5 (normal 2x2 binning)
>>                  apparently in response to the SOPGUI command issued at
>>                  00:57 nearly 8 minutes earlier
>>01:04:47Z  TCC:  track 25.2835, -9.3913 FK5   command received
>>                  TCC gets command nearly two minutes after SOPGUI command
>>                  showed up in the murmur log
>>01:04:47Z  Mur:  tLatch, drifts, MS.ON ...  mcp starts slewing telescope
>>                  mcp responds immediately to the track command once the TCC
>>                  sees it.
>>01:04:52Z  TCC:  gcam doread 5 /binfac = (1,1)
>>01:05:50Z  Mur:  Last mcp activity from gotoField
>>01:52:52Z  TCC:  Slew end from gotoField
>>01:06:12Z  Mur:  SPOGUI reissues gotoField -gflat
>>01:06:16Z  TCC:  track 25.2835, -9.3913 command reissued
>>01:06:24Z  TCC:  Slew end
>>01:06:31Z  TCC:  gcam doread 5 /binfac = (1,1)
>>
>>
>>
>>				Cheers,
>>
>>				  Dan
>>
>>
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