Matrix Orbital LK162-12 Legacy - Manual (Page 12)

LK162-12 rev 4 12
The 12 volt power cable is designed for use with wide voltage range display modules mounted in a PC.
Wiring required for the 12 volt power connector is shown in Figure 2-5 below.
PC wiring
Display module wiring
+5 V
+ 12 V
GND
GND
+ 12 V
Figure 2-5 Wiring for 12 volt modules
If you don't want to modify cable wiring yourself, Matrix Orbital can supply an adapter cable designed to
use with the display module when it's installed in a PC. The cable is wired as shown in Figure 2-6 below.
Figure 2-6 Twelve volt power cable
2.1.2 Applying Power through the DB-9 Connector
The LK162-12 can be powered by pin #9 on the DB-9 connector. If power is applied here, power cannot be
applied to the other power connector. The input voltage for pin #9 can only be +5Vdc, even if the unit is
wide voltage. Not following these instructions can destroy the unit.
To use the DB-9 connector for power you will have to solder a jumper as show in the bellow image.
2.1.3 RS-232 Communications
The RS-232 connector on the PC cable is wired so that a standard “straight through” 9 pin D-sub cable may
be used to connect the module to a standard serial port such as COM ports on PCs. Note that this device
complies with the EIA232 standard in that it uses signal levels from ± 12V to ± 12V and can be converted to
TTL levels as well. The LCD2041 is set at 19.2Kbps default speed. Other settings are: