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48
Circuit
Operation
The AL4008 provides chip selects and a data bus which is used to
address a single switched output from the 24 available.
The output devices used are 74HCT374 octal latches.
Please not the 470R pull down network attached to the data bus.
This device ensures that the relays do not momentarily energise
during the power on sequence.
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.
When the Hundred inputs are set to ‘7’ Test mode is active. The Ten
and Units inputs select the channel.
The following examples show the operation:
Hundreds Tens Units Output
DMX
Input
0 0
0
All
Off
Off
0
0
1
Controlled by inputs
On
5
1
2
Controlled by inputs
On
7
0
1
Output 1 On
Off
6
1
9
Output 19 On
Off
DMX512
Input
The DMX512 input connects directly to the output of a standard
RS485 or RS422 receiver such as the 75176.
Good Data
The GOOD signal is driven low to show that valid DMX512 data is
being received. The output is suitable for direct connection (via a
current limit resistor) to the cathode of a 20mA LED.
Power
Supply
The AL4008 requires a 5V DC supply at approximately 6mA
All Ground and Vcc pins must be connected.
The device is CMOS so normal handling precautions should be
adhered to.
Good decoupling and pcb layout conventions (i.e. fill all unused pcb
areas with grounded copper planes) should be followed.
Particular attention should be paid to routing the crystal
connections.
Crystal
The AL4008 requires a 16MHz, fundamental mode crystal. A tuning
capacitance of approximately 12pF is suggested between each crystal
Содержание DMX512
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