Matrix Orbital LK402-25 Legacy - Manual (Page 10)

2.1.1 Power Through DB-9 Jumper
In order to provide power through pin 9 of the DB-9 Connector you must place a solder jumper on the
Power through DB-9 Jumper pictured in figure 10 below. The LK402-25 allows all voltage models to use the
power through DB-9 option, see table 68 on page 49 for display module voltage requirements.
Figure 10: Power Through DB-9 Jumper
WARNING Do not apply voltage through pin 9 of the DB-9 connector
AND through the Power/Data Connector at the same time.
2.2 Power/Data Connector
The Power/Data Connector provides a standard connector for powering the display module. The LK402-
25 requires five volts for the standard display module, between nine to fifteen for the wide voltage (V)
and between nine to thirty-five volts for the wide voltage with efficient power supply module (VPT). The
voltage is applied through pins one and four of the four pin Power/Data connector. Pins two and three are
reserved for serial transmission, using either the RS-232/TTL or the I
2 C protocol, depending on what has
been selected by the Protocol Select Jumpers. Pins two and three may be reversed by changing the Legacy
Connector Jumpers in order to be compatible with previous PCB revisions.
Pin 1 PWR (See table 68 on page 49)
Pin 2 Rx \ SCL (I 2 C clock)
Pin 3 Tx \ SDA (I 2 C data)
Pin 4 GND
Figure 11: Power Connector and Pin out
Matrix Orbital LK402-25 6