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<div dir="auto">Is your user a member of the dialout group? You
can't access serial ports unless you are. <br>
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Yes I am a member of dialout and I have no problem when my device
uses /dev/ttyUSB0 .<br>
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cite="mid:CAAsTreDYQqJBbqQyWQPNf0EdMQ333+_xhjQFgxPgTxudUNzXEg@mail.gmail.com">
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<div dir="auto">Also, '<span
style="font-family:sans-serif;font-size:12.8px">baudrate=57142</span><span
style="font-family:sans-serif">' looks a bit odd. 57600 is
more standard, but I've seen that number used for a couple
of motor controllers. <br>
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Yes this is a Dynamixel motor controller , they seem to prefer this
baud rate.<br>
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cite="mid:CAAsTreDYQqJBbqQyWQPNf0EdMQ333+_xhjQFgxPgTxudUNzXEg@mail.gmail.com">
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<div dir="auto"><span style="font-family:sans-serif">Is there a
way you can try it without the USB extender? <br>
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I can try this later when I have access to it again but I will need
to run it eventually with the extension.<br>
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cite="mid:CAAsTreDYQqJBbqQyWQPNf0EdMQ333+_xhjQFgxPgTxudUNzXEg@mail.gmail.com">
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<div dir="auto"><span style="font-family:sans-serif">Are you
using more than one usb serial device? If you are and they
are both Prolific devices, there is no way of telling them
apart by any device path. They will swap freely at
enumeration. Unlike FTDI adapters, Prolific have no serial
numbers. I try to avoid having two PL2303s on the same
machine, preferring a mix of FTDI, Qinheng and SiLabs. <br>
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My problem occurs when I am only using the one adapter. It is an
FTDI device.<br>
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cite="mid:CAAsTreDYQqJBbqQyWQPNf0EdMQ333+_xhjQFgxPgTxudUNzXEg@mail.gmail.com">
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<div dir="auto"><span style="font-family:sans-serif">If a
/dev/ttyUSB0 path works then the /dev/serial/* equivalent
must work: they're symlinks to the same device. The only
time I've seen it not work was in software that hard-coded
the device path to be 12 bytes. <br>
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<p>Yes the /dev/serial equivalent works as long as it's the
equivalent of /dev/ttyUSB0 .</p>
<p>To communicate with the motor I'm using the pyax12 communication
library <a moz-do-not-send="true"
href="https://github.com/jeremiedecock/pyax12/blob/master/pyax12/connection.py">https://github.com/jeremiedecock/pyax12/blob/master/pyax12/connection.py</a></p>
<p>Thanks,</p>
<p>Jim<br>
</p>
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