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DOC added notice on RS232 voltage levels 

fixes #41
This commit is contained in:
Patrick Kanzler 2016-01-06 12:13:35 +01:00
parent e88a19ef2d
commit 69680b04e9
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doc/user/raspi.rst
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@ -7,6 +7,11 @@ This instructions were tested on Raspbian.
Unless you have done any distro with libusb-1.0 on the Raspberry Pi, the Unless you have done any distro with libusb-1.0 on the Raspberry Pi, the
following instructions should works fine on your raspberry distro. following instructions should works fine on your raspberry distro.
.. warning:: You should **never** directly connect an printer with RS232-interface (serial port) directly to
a Raspberry PI or similar interface (e.g. those simple USB-sticks without encasing). Those interfaces are
based on 5V- or 3,3V-logic (the latter in the case of Raspberry PI). Classical RS232 uses 12V-logic and would
**thus destroy your interface**. Connect both systems with an appropriate *level shifter*.
Dependencies Dependencies
------------ ------------