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Diffstat (limited to 'README.txt')
| -rw-r--r-- | README.txt | 34 |
1 files changed, 25 insertions, 9 deletions
@@ -47,16 +47,24 @@ The files get installed in the "Lib/site-packages" directory in newer Python versions. Serial to USB adapters +---------------------- Such adapters are reported to work under Mac OSX and Windows. They are -mapped to a normal COM port under Windows, but on Mac OSX they have -special device names like "/dev/cu.USA19QW11P1.1" (built after this scheme: -/dev/[cu|tty].USA<adaptername><USB-part>P<serial-port>.1) either use these -names for the serial ports or create a link to the common device names -like "ln -s /dev/cu.USA19QW11P1.1 /dev/cuaa0" "ln -s /dev/cu.USA19QW21P1.1 -/dev/cuaa1" etc. -But be aware that the device file disappears as soon as you unplug the USB -adapter. +mapped to a normal COM port under Windows, but on Mac OSX and other platforms +they have special device names. + +Mac OSX: "/dev/[cu|tty].USA<adaptername><USB-part>P<serial-port>.1" + e.g. "/dev/cu.USA19QW11P1.1" + +Linux: "/dev/usb/ttyUSB[n]" or "/dev/ttyUSB[n]" + first for for RedHat, second form for Debian. + e.g. "/dev/usb/ttyUSB0" +Either use these names for the serial ports or create a link to the common device +names like "ln -s /dev/cu.USA19QW11P1.1 /dev/cuaa0" or "ln -s /dev/usb/ttyUSB0 +/dev/ttyS4" etc. + +But be aware that the (USB) device file disappears as soon as you unplug the USB +adapter. Short introduction @@ -100,7 +108,7 @@ ser = serial.Serial( bytesize=EIGHTBITS, #number of databits parity=PARITY_NONE, #enable parity checking stopbits=STOPBITS_ONE, #number of stopbits - timeout=None, #set a timeout value, None for waiting forever + timeout=None, #set a timeout value, None to wait forever xonxoff=0, #enable software flow control rtscts=0, #enable RTS/CTS flow control ) @@ -143,6 +151,14 @@ bytesize: serial.SEVENBITS serial.EIGHTBITS +Tips & Tricks +------------- +- Some protocols need CR LF ("\r\n") as line terminator, not just LF ("\n"). + Modems are an example of this behaviour. + +- Scanning for available serial ports is possible with more or less sucess on + some platforms. Look at the tools from Roger Binns: + http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/bitpim/comscan/ References ---------- |