Matrix Orbital LCD/VFD Legacy - Manual (Page 10)

2.1.4 Power through the DB-9 Connector
The display 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.
WARNING Failure to follow these instructions will destroy the unit.
Solder a jumper as shown in the below image to use the DB-9 connector for power .
Figure 9: DB-9 Connector
2.1.5 RS-232 Communications
A standard DB-9F is provided for RS-232 communications. Power may also be supplied via this con-
nector if desired.
Figure 10: RS-232 and Power Connector
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