MDM Trouble Report for 2012 Oct 20 Telescope: 2.4m Observer(s): Adams (OSU) Instrument: OSMOS Problem(s) Encountered: 45 min before the beginning of morning twilight the disperser wheel stopped responding. I received the following error: pr> disp 1 Setting disperser... Error: Command returned error ERROR: DISPERSER DISPERSE=TIMEOUT cannot read from 140.252.83.155:8003 Error setting the Disperser Programming Error: invalid error code: -99 DISPERSER request aborted with errors. Execution error in Prospero command. Command: disp 1 I followed the OSMOS Manual's troubleshooting step to reset the wheel, but this command only returned the same error. pr> disp reset Resetting DISPERSER... Error: Command returned error ERROR: DISPERSER DISPERSE=TIMEOUT cannot read from 140.252.83.155:8003 DISPERSER request aborted with errors. Execution error in Prospero command. Command: disp reset I also tried restarting Prospero and it didn't seem to have any complaints, but now the Prospero Status window displays Disperser: ** ??* . pr> restart Connecting to ISIS... ...Prospero client started on network port 6606 ...connected to ISIS server IS Loading the OSMOS instrument initialization file... Getting Configuration Host (IC) info... Getting IC status... Getting Instrument Status... Getting Caliban status... Loaded Filter Table 1 of 2... Loaded Filter Table 2 of 2... Loaded Slit Table... Loaded Disperser Table... Uploading the OSMOS device tables to the IE... Filter Wheel 1 device table synched Filter Wheel 2 device table synched Slit Wheel device table synched Disperser Wheel device table synched Caliban data-transfer disks synchronized & ready... FITS Images will be written to directory: /lhome/data Next FITS file to be written is: osmos.0256 Last file written to disk by Caliban: /lhome/data/osmos.0255 TCS Interface enabled... Getting telescope status... RESTART Complete... I was not able to resolve the problem. ------------------------------ Submitted on 2012 Oct 21 [5:10:46]