Matrix Orbital GLK24064-25 Legacy - Manual (Page 10)

GLK24064-25 rev. 06 10
PC wiring
Display module w iring
+5 V
+12 V
GND
GND
+12 V
Figure 2-4 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 2-5 below.
Figure 2-5 Twelve volt power cable
Note: The connector provided does not allow access to the middle two pins, which are used for I 2 C
communications. If you need this functionality, we suggest you wire a suitable connector.
2.2 RS-232 Communications
2.2.1 DB9 Connector Pin Out
RS - 232 port: This connector is wired so that a standard “straight through” 9 pin D-sub cable may be used
to connect the modules on a standard serial port such as comm ports on PCs. Note that this device complies
with the EIA232 standard in that it uses signal levels from +/- 3V to +/- 12V. It will not operate correctly at
TTL (0 to +5V) levels.
Pin Number Pin Number Pin Number Pin Number Direction Direction Direction Direction Description Description Description Description
2 from LCD module Data Out
3 to LCD module Data In
5 - Ground
9 to LCD module +5Vdc