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stephane edited this page Jul 12, 2011
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merge RTAI branch https://github.com/clecol/libmodbus
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fix https://github.com/stephane/libmodbus/issues/11
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fix https://github.com/stephane/libmodbus/pull/8
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I had a problem with 2 RTU devices in the same RS-485 serial bus. It worked well, but I needed to put a delay of 500 miliseconds when switching interrogation from one slave to the other, otherwise errors happened all the time. Then, I discovered that if I added an fsync() call after the write() in your code, I could reduce the delay to 150 miliseconds, which is a very important improvement!