Serge NOEL
96 lines
4.4 KiB
Plaintext
96 lines
4.4 KiB
Plaintext
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<title>JMRI: NCE Clock Monitor</title>
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<meta name="author" content="Bob Jacobsen">
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<meta name="keywords" content="JMRI NCE clock monitor fastclock source">
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<h1>NCE Fast Clock</h1>
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<p>The NCE fast clock can be either a source of fast time or can be commanded to follow the
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internal clock. The best synchronization is when the NCE clock is the master source. It works
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by adjusting the internal clock ratio so the fast minutes will be the same. The provides for
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the clocks to be basically in sync all the time. Adjustments are made about every 20 fast
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seconds.</p>
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<p>You may also have the internal clock drive the NCE fast clock. However, this requires some
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number of seconds to be added or skipped in the NCE fast clock so the minutes will roll over
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at the same time. That minute roll over is critical for the NCE as that is when the time is
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sent to all the Pro cabs. Due to limited adjustments in the NCE fast clock this method causes
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the clock to run fast for part of the minute and slow for the other part of the minute so the
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minute roll over is correct.</p>
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<h1>NCE Clock Monitor</h1>
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<p>When running in the NCE as clock master mode, the internal clock rate is adjusted to match
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time with the NCE command station clock. The goal is the minute should roll over at the same
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time for the internal clock and ProCab displays should change the same as clocks on PanelPro
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etc....</p>
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<p>When running with the internal clock as master, the NCE clock is adjusted, forward or
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backwards, some number of seconds just before the minute rolls over. So NCE time does jump
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slightly as time is adjusted but the goal is the minutes tick off at the same time as the
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internal clock.</p>
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<p>This service depends on being able to do memory read and write commands to the command
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station. This is currently supported by the serial connection on the command stations only.
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Those devices that rely on the NCE-USB adapter, like the PowerCab or SB3, are not currently
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supported due to lack of command station memory access.</p>
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<h2>Clock Status Lines</h2>
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<p>These lines display current status of each clock and settings. When running in sync mode,
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the line that is the master will be so marked. Also the current error between the NCE and
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internal clock will be displayed.</p>
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<h2>Clock Settings</h2>
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<p>These are the same as making changes from the ProCab throttle. If the sync mode is
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'Internal Master' these are disabled and you have to make your changes via the internal clock
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control panel.</p>
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<p>Changing clock settings while in sync mode will cause the sync mode to reset and perform
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initialization for that sync mode.</p>
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<h2>Polling Speed</h2>
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<p>This sets how often a clock read is made just for the purpose of updating the clock
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monitor display. Setting this low will increase the serial traffic to the command station.
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But setting this high will also cause the clock status display to lag considerable and the
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indicated 'error' will tend to look worse but that is cosmetic only.</p>
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<h2>PID Constants</h2>
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<p>These values should generally be left alone. They adjust how the calculations are handled
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to keep the NCE and internal clock in sync. It was a very loose 'PID' type calculation.
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Generally the clock sync will improve as it is allowed to run. The first few minutes may hunt
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around while finding the best adjustments.</p>
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<h3>P Factor</h3>
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<p>This adjusts how much the current error is used to adjust the clocks.</p>
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<h3>I Factor</h3>
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<p>This adjusts how much the difference between the current error and prior error is used in
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the clock adjustments.</p>
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<h3>D Factor</h3>
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<p>This adjusts how much the rate of change between the current error and the prior error is
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used in adjusting the clock.</p>
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