X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=readme.rst;h=e3792211b6c172ae506f7f073b0517e715250bec;hb=4c3b9ed9f52a47c853125f848fab50ad7ff11f3b;hp=4103d18ce0db158c9842f435b9ae1944fbe83b8a;hpb=e6fb8c97360e26908877df54251c95c768d76761;p=elmcan.git

diff --git a/readme.rst b/readme.rst
index 4103d18..e379221 100644
--- a/readme.rst
+++ b/readme.rst
@@ -105,6 +105,20 @@ The line discipline can be attached on a command prompt as follows::
 To change the ELM327's serial settings, please refer to its data
 sheet. This needs to be done before attaching the line discipline.
 
+Once the ldisc is attached, the CAN interface starts out unconfigured.
+Set the speed before starting it:
+
+    # The interface needs to be down to change parameters
+    sudo ip link set can0 down
+    sudo ip link set can0 type can bitrate 500000
+    sudo ip link set can0 up
+
+500000 bit/s is a common rate for OBD-II diagnostics.
+If you're connecting straight to a car's OBD port, this is the speed
+that most cars (but not all!) expect.
+
+After this, you can set out as usual with candump, cansniffer, etc.
+
 
 
 Known limitations of the controller