The DMX-9 board is designed to work with Common Anode configured LED systems. As Standard
it works with regulated 12 to 24Vdc power inputs, and outputs this to the LED outputs
through a dimming control system.
Maximum output current per colour
channel: 5Amps (Fused).
Maximum total output drive capability: up
to 25A total capability.
Input Power Consumption: 50mA
quiescent current at 12Vdc with no LED loading.
Output frequency: 100Hz approx.
Dimming levels (all channels): Off
and 1 to 255 (0 to 100%)
Selectable DMX termination impedance:
Standard FR4 double sided PTH board, 1.6mm thick. 106mm x 138mm size.
Tallest component 20mm above PCB.
Recommended underside clearance 5mm.
Fixing centres on 99mm x 130mm. Fixing hole size 3mm dia.
Recommended maximum screw and pillar outer diameter: 6mm (if metal).
A. interface Protocols
DMX512: RS485 standard at 250kbps. 8 Data bits, 1 Start bit, 2 Stop bits.
B. RS232: RS232 standard at 19.2kbps. 8 Data bits, 1 Start bit, 1 Stop bit, no Parity.
A.USITT DMX512 / 1990 (4µSec) This is an industry standard interface used widely for the
control of lighting dimmers. The DMX-9 board is also capable of handling the older version
of DMX512 having a 4µ Second ‘Mark After Break’ with no change of setting. Using dip
switches, the user can select a start address anywhere between 0 and 511. The user is also
able to terminate the DMX512 chain by simply flicking a dip switch - no need for a
terminator plug. The integral DMX512 interface includes isolation from the rest of the
circuit and mains earth to avoid earth problems.
B. RS232 Interface (Optional Extra) This interface can connect directly to a PC or MAC with
an RS232 (serial) port. All the functions DMX can offer are available through this
interface along with a few extras. This allows for custom PC or MAC software to be written
to perform the required functions, without the expense of a DMX controller. Alternatively
an embedded system could also take control of the board.
> In-built Stand Alone Functions By setting high unused DMX addresses, stand-along
programs are activated. These programs do not require any external controller and free run
from the point of switch on. Also diagnostic functions are available to help quickly solve
connection and other problems.
For stand-alone operation, DMX9-27 uses following DMX address functions:
Address 511: All channels on full -
useful for checking connections
Address 510: Cross fade pattern on
Address 509: System check - outputs
checksum on LEDs.