46
CY3274 Cypress High Voltage Programmable PLC Development Kit Guide, Doc. # 001-53598 Rev. *G
PLC Development Board
4.3.2
LCD Daughter Card
The LCD module is connected to header LCD1 and controlled with the CY8CPLC20 port 4 pins
P4[6:0].
Figure 4-4. LCD Daughter Card
Connect the LCD daughter card to the main board as shown in
. LCD contrast is
controlled by the potentiometer R46.
Figure 4-5. LCD Daughter Card Board Connection
R47
This is a variable resistor (potentiometer) that connects to the VR header. It
can be used to generate a voltage b5 V and GND.
RX LED[DS2]
Red LED that can be used to indicate when the board is receiving data
S2
Reset switch for resetting the CY8CPLC20-OCD chip
S3[7-0]
These dip switches are general purpose and can be routed to any port of the
CY8CPLC20 chip.
SW
Header connected to the switch S4. S4 is a general purpose switch. Active
HIGH (connected to V
DD
when pressed).
TP1, TP2, TP3, TP4
Grounded test points to facilitate probing/debugging. These test points
connect to the board ground plane.
TX LED[DS3]
Green LED that can be used to indicate when the board is transmitting data
on to the powerline
VR
Header connected to the potentiometer R47
Headers and Jumpers
Description
Potentiometer R46
-> For LCD Contrast
