HUST H2N Connecting Manual
4 - 6
z CONTRAST, R7
This is an adjustable resistor for LCD screen contrast adjustment.
z D/A Connector
This connector is for special application and it needs an IC for it to be effective.
In addition, the PLC should includes C100 = 1 and the registers in PLC are R152
and R153.
R152 = Input signal = 0 ~ 10V
R153 = Output signal = -10.000V ~ +10.000V
The decimal format for R153 is 2 integer with 3 decimal points.
If R153 = 05200, it means 5.2 volts.
Fig 4-7 D/A Connector
5
4
3
2
1
9
8
7
6
+12V
ADC N
+5V
VCOM
+12V
-12V
GND
GND
-12V
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