updated protocol docs

git-svn-id: https://svn.spreadspace.org/mur.sat@32 7de4ea59-55d0-425e-a1af-a3118ea81d4c

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diff --git a/doc/protocols/ground-crx.txt b/doc/protocols/ground-crx.txt
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+Protocol Definition between Ground Stations and Command RX
+==========================================================
+
+
+Introduction
+------------
+
+using DTMF on FM
+receiver should be activated for min. 200ms every 5s to listen for new commands
+signs get scrambled using a secret Code Table
+every command must be aknowledge by a beacon with the unscrambled code
+
+Frame
+-----
+
+#42<code><cs>
+
+Checksum:
+---------
+
+Xor over Signs intrepreted as HEX (0-9A-D#*)
+
+Codes:
+------
+
+0    ..    shut up (rfkill)
+1    ..    unshut up (no rfkill)
+
+8    ..    activate payload reciever
+
+C    ..    cancel all commands
+#    ..    reset
+*    ..    safe mode