User guide

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12
It is imperative that the rise time of the signal is greater that 1uS.
Failure to adhere to this specification may cause output inaccuracy.
The minimum low period of the zero cross signal is 10uS.
The allowed frequency range is 90Hz to 125Hz. Frequencies outside
this range will cause non linear output.
Output
timing
The following examples show the relationship between Output, Zero
cross for three input values.
DMX512
Base
Address
The BCD inputs are used to set the DMX base address. The inputs
are set up for connection of three standard Binary Coded Decimal
Thumbwheel switches. The BCD inputs are active low, i.e. to select a
base address of 001, connect UNIT1 to ground and pull up all other
BCD inputs. Valid addresses range from 001 to 512.
Test Mode
The BCD inputs are also used to enter test mode.
When Test mode is active, the DMX512 input is disabled, but the
Analogue inputs remain active.
When the Hundred inputs are set to either ‘6’ or ‘7’ Test mode is
active. The Hundred input sets the intensity, while the Ten and Units
inputs select the channel.
The following examples show the operation:
Hundreds Tens Units Output DMX
Input
Analogue
Input
0 0 0 All Off Off Off
0 0 1 Controlled by inputs On On
5 1 2 Controlled by inputs On On
7 0 1 Output 1 @ 100% Off On
6 0 1 Output 1 @ 50% Off On
7 0 9 Output 9 @ 100% Off On
6 1 2 Output 12 @ 50% Off On
Analogue
Inputs
The Analogue inputs are decoded by the external multiplexers.
Designs which do not require analogue inputs or preheat may ground
the AN-X inputs. The Preheat input value is applied to all channels.
No analogue input voltage may exceed 5V. The following table shows
the decoding.
ANAD1 ANAD AN-A AN-B AN-C AN-D
90% Output
50% Output
10% Output
Zero Cross