Features:
USITT DMX512 / 1990 (4µSec)
compliant
Fully selectable DMX base address
350mA, 500mA or 700mA constant
current output (specify when ordering)
On-board terminate setting (120
Ohm)
Full isolation from DMX connection
for maximum reliability
Power and Data indicator LEDs
Built in stand-alone programs
Custom builds available
Specifications:
Output current per colour channel:
350/500/700mA.
Maximum total output drive
capability: 5 to 6 LEDs depending on Vf of LEDs used.
Input Power Consumption: 100mA
approx. quiescent current at 24Vdc with no LED loading.
Output frequency: 100Hz approx.
Dimming levels (all channels): Off
and 1 to 255 (0 to 100%)
Selectable DMX termination impedance:
120W PCB Dimensions: Standard FR4 double sided PTH board, 1.6mm thick. 106mm x 138mm
size.
Tallest component 35mm 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
all channels
Address 509: System check - outputs
checksum on LEDs.
Dip Switch Configuration:
The dip switches are located at the front of the board beside the two status LEDs. The
switch is a right-angled type, so to be accessible from the outside of a casing through a
cut-out window. The 10 dip switches provide access to all the user settings. These switches
are read only on start-up, so any changes made while the board is powered will require a
power down reset to take effect. Switch functions are given below:
SW1: DMX address bit 0 [ = 1].
SW2: DMX address bit 1 [ = 2].
SW3: DMX address bit 2 [ = 4].
SW4: DMX address bit 3 [ = 8].
SW5: DMX address bit 4 [ = 16].
SW6: DMX address bit 5 [ = 32].
SW7: DMX address bit 6 [ = 64].
SW8: DMX address bit 7 [ = 128].
SW9: DMX address bit 8 [ = 256].
SW10: DMX Terminate (on or off). Changing this switch does not require reset.
Note: Setting a DMX start address of 0 (switches 1..9 off) is invalid for DMX and will
invoke RS232 mode. Any non zero setting of Switches 1..9 will set the base address of the
board for DMX mode, such that output channel 1 will respond to data at the base address,
output 2 respond to data at base address +1 and so on.
For stand-alone use the following table shows the high DMX addresses functions:
Address 511: All channels on full -
useful for checking connections
Address 510: Cross fade pattern on
all channels
Address 509: System check - outputs
checksum on LEDs.
