--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/dmx.txt Tue Jul 26 22:43:59 2011 +0300
@@ -0,0 +1,53 @@
+* 250 kHz clock
+ * 250000 bits / s
+ * 4µs / bit
+* idle line = high (transmitter/master drives line high)
+
+
+
+Packet structure:
+
+* paket format
+ * break
+ * mark (MAB)
+ * 2-512 frames
+ * frame 0 = start code = 0x00
+ * frame N = channel N = 0-255
+ * 1 start bit, 8 data bits, 2 stop bits, no parity
+ * mark (MTBF)
+ * mark (MTAP)
+
+* break
+ * syncs start of DMX packet
+ * >= 22 low bits (88 µs)
+ * up to 1s
+ * recommended 25 - 30 low bits
+
+* mark after break (MAB)
+ * immediately follows the break
+ * high mark of > 2 bits (8µs)
+ * up to 1s
+ * recommended 3 high bits
+
+* (channel frames)
+ * first frame is start code (SC)
+ * data value = 0x00 signifies dimmer data
+
+ * 11 bits / frame
+ * 1 low bit (start bit)
+ * 8 data bits (0-255)
+ * 2 high bits (stop bits)
+
+ * mark time between frames (MTBF)
+ * idle time between frames; line kept high
+ * can be as short as desired
+
+ * between 1 and 512 sequential frames
+
+* mark time between packets (MTBP)
+ * after the last frame's stop bits
+ * same as MTBF
+ * idle time between packets; line kept high
+ * can be as short as desired
+
+