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    User name M. Stevens

    Log entry time 21:48:25 on October 07, 2006

    Entry number 186561

    keyword=Right Dipole Stuck

    Repeat scenario of the past few days. The right dipole stops responding to any command from the controls. This time I tried sending legitimate commands from the laptop to the Dynapower before I began resetting it. The Octagon computer gave me an ¨error 2 syntax error¨ when I entered any of STA, AMP, VLT, or RST. It seems something is corrupting the Octagon code; perhaps it is the gibberish that Jack and I saw coming out of the IOC serial Industry Pack.

    I again initiated the James Proffitt flying reset procedure and the Dynapower Octagon immediately responded. Part of that procedure is to load a fresh version of the running code from memory, and then modify it so that it will only ramp down. In principle, we may be able to develop another procedure to load and run a fresh (uncorrupted) program, but one that allows the Dynapower to stay at the previously set current, and being uncorrupted it should then respond to commands. If we plug a serial port server into the RS-485 line to the Dynapower, we should be able to accomplish this without a controlled access. This would save the ramp down and ramp up time penalties we incur with the current procedure.

    A copy of this log entry has been emailed to: gomez@jlab.org, segal@jlab.org