Specifications subject to change without notice
© Digital View Ltd – Ver 1.5 7 May 2020 (DT-1920-HDMI-EDPT_manual.doc)
Page 19 of 33
APPLICATION NOTES
USING THE CONTROLLER WITHOUT BUTTONS ATTACHED
This is very straightforward:
•
Firstly setup the controller/display system with the buttons. With controls attached and display system active make any settings
for color, 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 JP6, 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:
•
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/24V DC. This should be matched with the inverter
specification: see table.
CNB1
PIN
DESCRIPTION
1
Ground
2
+12V/+24VDC
Remark: For higher power inverter, more current (for 12V/24V) 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
DESCRIPTION
3
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
Purpose
Note
JB2
Inverter enable voltage
1-2 H = 3.3V, 2-3 H = 5V, OPEN H = open collector
JB3
Inverter control
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:
•
Brightness can control 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
DESCRIPTION
4
VR WIP
5
VR A
This can then be matched with function controls connected to CNC1 pins 4 & 3 or 5: see table.
CNC1
PIN
DESCRIPTION
3
VR A
4
VR WIP
5
VR B
