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Matrix Orbital LK202-25 LCD schematic:

GPO 1

GPO 6

General

Purpose

outputs

* Connector

General Purpose Outputs

4 pin power

10 pin keypad header

DB-9F

For more details refer to Matrix Orbital Users Manual for LK202-25.

©Digital Alert Systems, LLC 2004

Power

10 pin keypad

Connector

header

Pin 1

Pin 4

Function

2 Status LEDs, optional GPO relay control

GPO1 Green LED System status

GPO2 Red LED EAS Alert status

GPO3-6 available for external GPO relay control

LCD power ( 5.0VDC), unused I2C comm.

Pin1 +7 to +15 VDC

Pin2 I2C SCL clock

Pin3 I2C SDA data

Pin4 Ground

generate 25 key states-optional GPI input

RS-232 connection to VIA motherboard COM2 serial port

Pin2 Data from LCD

Pin3 Data to LCD

RS-232

Pin 5

Pin 1