Figure 1 – DMX 512 Bus Connection
 
하드웨어 통신 방식은 RS-485 입니다.
 

Figure 2 – DMX Frame
http://www.altium.com/community/newsletters/december-09/en/nanoboard_controller.cfm
 
조명장치에 많이 사용하는 DMX512 프로그램 포멧은
데이터를 전송 하기 전에 BREAK 신호를 전송하고
SLOT0 위치에 스타트(0x00)를 전송 한 후
SLOT1부터 512개의 데이터를 한번에 전송 합니다.
각각의 장치는 SLOT1 부터 SLOT512까지 자기 어드에스 위치의 데이터를 읽어서 표시에 사용합니다.
 

Start bit, stop bit and date frame  
250Kbps를 사용하므로 1비트가 4us입니다.
1 Start bit + 8 date bits + 2 stop bits = 11 bits
 
Which connectors and how to connect them? 
If connectors are used, then it must be 5-Pol XLR types. 
Pin 1 = signal reference = cable shield 
Pin 2 = signal inversion = ' - ' 
Pin 3 = signal = ' + ' 
Pin 4 = optional (e.g. acknowledgment) 
Pin 5 = optional (e.g. acknowledgment) 
 
  
http://www.theater-technisch-lab.nl/dmxen.htm
 
 
 

Nr.
Signalname
Min.
Typ.
Max.
Einheit
1
RESET
88
88
us
2
MARK zw. RESET und Startbyte
8
-
1 s
us
3
Frame-Zeit
43,12
44,0
44,48
us
4
Startbit
3,92
4,0
4,08
us
5
LSB (niederwertigstes Datenbit)
3,92
4,0
4,08
us
6
MSB (höchstwertigstes Datenbit)
3,92
4,0
4,08
us
7
Stoppbit
3,92
4,0
4,08
us
8
MARK zwischen Frames (Interdigit)
0
0
1,00
s
9
MARK zwischen Paketen
0
0
1,00
s
 
 

 
5-poliger XLR-Steckverbinder

Pin
Funktion
1
Masse (Abschirmung)
2
DMX-
3
DMX+
4
frei, oder 2. Verbindung (2. Link, optional) DMX-
5
frei, oder 2. Verbindung (2. Link, optional) DMX+
 
 
3-poliger AXR-Steckverbinder, MARTIN-Belegung
DIESER STECKER IST NICHT NORMMÄSSIG !

Pin
Funktion
1
Masse (Abschirmung)
2
DMX+
3
DMX-
 
 
3-poliger AXR-Steckverbinder, internationale Belegung
DIESER STECKER IST NICHT NORMMÄSSIG !

Pin
Funktion
1
Masse (Abschirmung)
2
DMX-
3
DMX+
 
 
DMX-512 Repeater:
http://www.soundlight.de/techtips/dmx512/dmx512.htm
 
 
 
 
Figure 2. The DMX-512 protocol.
(full size)
http://bhanderi.dk/teaching/pro7/f7.php
 
 
SPACE for BREAK
MARK after BREAK (MAB)
Slot Time
START bit
LEAST SIGNIFICANT Data BIT (LSB)
MOST SIGNIFICANT Data BIT (MSB)
STOP Bit
STOP bit
MARK time between slots
MARK before BREAK (MBB)
BREAK to BREAK time
RESET Sequence (BREAK, MAB, START Code)
DMX512 Packet
START CODE (SLOT 0 Data)
SLOT 1 Data
SLOT n DATA ( Max. 512)
The timing for the signal, as described in the draft DMX-A specification, is shown in the following table.
Designation
Description
Transmitter
Receiver
Min
Typical
Max
Min
Typical
Max
-
Bit Rate
245
250
255
245
250
255
kbits/sec
-
Bit Time
3.92
4
4.08
3.92
4
4.08
µs
-
Min. Update time for 513 slots
-
22.7
-
-
22.7
-
ms
-
Max. Refresh rate for 513 slots
-
44
-
-
44
-
updates/sec
1
SPACE for BREAK
92
176
-
88
176
-
µs
2
MARK after BREAK (MAB)
12
-
< 1.00
8
-
< 1.00
µs
s
9
MARK Time between slots
0
-
< 1.00
0
-
< 1.00
s
10
MARK before BREAK (MBB)
0
-
< 1.00
0
-
< 1.00
s
11
BREAK to BREAK time
1204
-
-
1.00
1196
-
-
1.25
µs
s
13
DMX512 Packet
1204
-
-
1.00
1196
-
-
1.25
µs
s
http://www.erwinrol.com/dmx512/
 
 
 
http://www.dmx512-online.com/packt.html
 
 
 
http://dmx512net.com/lj/Support1_e.html