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APPLICATION NOTES
USING THE CONTROLLER WITHOUT BUTTONS ATTACHED
This is very straightforward:
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Firstly setup the controller/display system with the buttons. With controls attached and display system active make any
settings for colour, tint and image position as required then switch everything off.
Remove the control switches, the 12-way (CNC1) cable.
Use a jumper or similar to connect pins 1 & 2 on CNC1, this will fix the board On.
Refer to inverter specifications for details as to fixing brightness to a desired level, this may require a resistor, an open
circuit or closed circuit depending on inverter.
Summary : On CNC1 the only pins that are used are for On/Off and Brightness (if controller mounted inverter is used). On
CNC1 the pins are for momentary type buttons so it doesn’t matter that no buttons are attached.
INVERTER CONNECTION
There are potentially 3 issues to consider with inverter connection:
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Power
Enable
Brightness
Please read the following sections for a guide to these issues.
Inverter Power : As per the table for CNB1 pin 1 is ground and pin 2 provides 12V DC. This should be matched with the inverter
specification: see table.
CNB1
PIN
1
2
DESCRIPTION
Ground
+12VDC
Remark: For higher power inverter, more current (for 12V) can be taken from CNA1 pin 1.
Enable : This is a pin provided on some inverters for On/Off function and is used by this panel controller for VESA DPMS
compliance. If the inverter does not have an enable pin or the enable pin is not used then DPMS will not be operational. Pin 3
should be matched to the inverters specification for the ‘enable’ or ‘disable’ pin.
CNB1
PIN
3
DESCRIPTION
Enable
Further, jumpers JB2 & JB3 should be set to match the inverters specification for the enable pin power and High or Low setting:
see table.
Ref
JB2
JB3
Purpose
Inverter enable voltage
Inverter control
Note
1-2 H = 12V, 2-3 H = 5V (Vcc), OPEN H = open collector
1-2 H = On, 2-3 L = On
Brightness : There are various methods for brightness control and it is important to consider the specifications for the inverter to
be used. Generally the situation is:
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Brightness can controlled by using a resistor or VR (Variable Resistor).
Brightness controlled by adding a circuit such as PWM (Pulse Width Modulation).
No adjustment of brightness is possible.
CNB1 pins 4 & 5 are available for connecting to an inverter or circuit where VR control is supported.
CNB1
PIN
4
5
DESCRIPTION
VR WIP
VR A
This can then be matched with function controls connected to CNC1 pins 4 & 3 or 5: see table.
CNC1
PIN
3
4
5
DESCRIPTION
VR A
VR WIP
VR B
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