Matrix Orbital LK202-25 Legacy - Manual (Page 8)

LK202-25 rev 3 8
2. Connections
2.1 Connector Pinout
Refer to the diagram below for this chapter.
Key pad
Connector
Powe r
connecto r
Ge neral
Purpose
Outputs
RS -232
pin 1
+5 gnd
pin 1 pin 5
1
2
3
4
5
6
Figure 2-1 Electrical Connections
The LK202-25 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)
2.1.1 Power and I
2
C Connections
Power is applied via pins 1 and 4 as shown in Figure 2-1. 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.
Connector pinout is as follows:
1 2 3 4
Figure 2-2 Power connector
Pin 1 +5.0 VDC (+7 to +15 VDC with wide voltage option)
Pin 2 SCL (I
2
C clock)
Pin 3 SDA (I 2 C data)
Pin 4 Ground