raspi rs485 links

http://www.tagol.de/blog/anschluss-raspberry-pi-kwl-helios-pro---rs485
http://www.mikrocontroller.net/topic/347149
http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/
http://noctis.de/ramblings/linux/49-howto-fixed-name-for-a-udev-device.html
http://www.forum-raspberrypi.de/Thread-raspi-als-solarlogger-vergisst-usb-peripherie
http://www.forum-raspberrypi.de/Thread-raspberry-pi-am-rs485-bus-einer-pv-anlage
https://www.raspberrypi.org/forums/viewtopic.php?t=12227&p=132549
https://www.symcon.de/forum/threads/25074-Stromz%C3%A4hler-per-RS485-(Modbus)-mittels-Raspberry-Pi