Changes between Version 7 and Version 8 of Specs/I²C/Protocol

Timestamp:

09/09/13 02:27:54 (11 years ago)

Author:

ph3-der-loewe

Comment:

+DMX512

Specs/I²C/Protocol

@@ -101 +101 @@
 === Device Serial ===
 The serial of the device is given as a 16 byte bitstring. This is intended to be used to store an UUID as device serial. If a vendor uses some other numbering a schema neets to be established that maps those serials to the device serial field. A mapping should be chosen that complies with the current UUID standard.
+
+
+== Bank 63: DMX512 ==
+The DMX512 bank consists of two parts: the sub-bank part and the data part:
+||= Offset =||= Length =||= Description         =||
+||4         ||1         ||Subbank select         ||
+||5-end     ||till end  ||Data                   ||
+
+The subbank select is the offset of the DMX data as mapped into the bank.
+The channel of a given address is: (address-5)+32*subbank.
+This allows access to about eight thousand channels, or sixteen universes.
+
+A typical method to randomly access channels is:
+{{{
+ variables of unsigned integer type: bank, offset
+
+ bank = int(channel/32)
+ offset = bank*32
+
+ write_to_device(OFFSET_SUBBANK, bank)
+ write_to_device(OFFSET_DATA+channel-offset, value)
+}}}