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Appendix E – Using COM0 / J6 for 3.3V CMOS Interface
The SLCD+ serial port COM0 is typically used for communication using RS232 levels.
However, by removing resistor R24, it can use 3.3V CMOS logic levels.
COM0 Logic Level Mode:
1. Resistor R24 (next to J6) must be removed.
Connector J6 in Logic Level Mode:
J6 8 Pin Molex 53261-0890 for Power and Communications
Pin
Logic level mode – R24 not installed
1
TxD- output from microcontroller.
2
RxD- input to microcontroller *
3
do not connect
4
do not connect
5
Backlight power (Typ. 12V) input
6
3.3V out (reference only)
7
5V Input
8
GND (power and communications)
*
R24 must be removed to avoid conflict with RS232 receiver.
Typical connection directly from a microcontroller is as
follows:
SLCD+ Controller Manual V1.1
8/14/2009
Page 29
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