Matrix Orbital LK204-25 Legacy - Manual (Page 13)

Pin 2 Tx \ SDA (I 2 C data)
Pin 3 Rx \ SCL (I 2 C clock)
Pin 5 GND
Pin 9 PWR (Must solder Power Through DB-
9 Jumper. See table 70 on page 54 for
power requirements.)
Figure 14: RS-232 Pin out
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 15 below. The LK204-25 allows all voltage models to use the
power through DB-9 option, see table 70 on page 54 for display module voltage requirements.
Figure 15: 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.
Matrix Orbital LK204-25 9