Matrix Orbital LK204-25 Legacy - Manual (Page 7)

2.Connections
2.1Connector Pinout
Refer to the diagram below for this chapter.
Figure 2-2 Electrical Connections
The LK204-25 has four connectors:
Connector Function
14 pin dual header General purpose outputs (6) (see section 2.2)
4 pin power (5.0 VDC) and I 2 C communications (see section 2.1.1)
10 pin header Keypad (see section 3.4.12)
DB-9F RS-232/power (see section 2.1.1.1)
2.1.1Power and I 2 C Connections
Power is applied via pins 1 and 4 as shown in Figure 2-2. Power requirement is +5 VDC ±0.25V. Power
may also be supplied via the RS-232 connector as described in the next section.
Warning:
 Do not apply any power with reversed polarization.
 Do not apply any voltage other than the specified voltage.
 Do not use any cables other than the cables supplied by Matrix Orbital,
unless you are aware of the modifications required.
 Do not apply voltage to the DB-9 connector AND power connector
LK204-25 rev 1 7