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[WIP] Add 485 deadtime enforcement #61

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[WIP] Add 485 deadtime enforcement #61

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Commits on Dec 7, 2018

  1. Add 485 deadtime enforcement 

    http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf

2.5.1.1 MODBUS Message RTU Framing

In RTU mode, message frames are separated by a silent interval of at
least 3.5 character times.
    @altendky
    altendky committed Dec 7, 2018
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Commits on Dec 12, 2018

  1. Fix use of time.monotonic() for py2 compatibility

    @altendky
    altendky committed Dec 12, 2018
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Commits on Dec 14, 2018

  1. Make sure to wait at least the deadtime 

    Especially in older versions, `time.sleep()` may return early.

https://docs.python.org/3.7/library/time.html#time.sleep
    @altendky
    altendky committed Dec 14, 2018
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  2. Remove erroneous space

    @altendky
    altendky committed Dec 14, 2018
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