Matrix Orbital LK204-25 Legacy - Manual (Page 9)

2.1.1.2Wide Voltage Range Modules
Note: Do not use this cable unless your display module has the "wide voltage range" option (option V). Use
of the 12 volt power cable with 5 volt modules will damage the module.
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 2-6 below.
PC wiring
Display module wiring
+5 V
+12 V
GND
GND
+12 V
Figure 2-6 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 2-7 below.
Figure 2-7 Twelve volt power cable
2.1.2RS-232 Communications
A standard DB-9F is provided for RS-232 communications. Power may also be supplied via this connector
if desired. See Figure 2-8 for pin connections.
Figure 2-8 RS-232 and power connector
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
LK204-25 rev 1 9