Omega-vehicle-security OMP-MODL Manuel d'utilisateur télécharger pdf (Page 20)

2... OMP-MODL System Base

Using the OMP-MODL

2-11

RTC / Memory Backup Battery

The OMP-MODL utilizes static ram for internal data storage which requires a

constant power supply to maintain its memory. Similarly, the Real Time

Clock (RTC) that keeps track of the date and time within the OMP-MODL

runs continually whether the main power switch is ON or OFF.

When the main power is ON, the memory and RTC draw their power from

the D-Cell batteries (or a connected external power supply). When the main

power is switched OFF, power for memory and the RTC automatically

switches to a small coin type lithium cell that is mounted on the main OMP-

MODL circuit board (Figure 2... -7).

This cell will provide power for the RTC and memory for approximately one

year. Any time that the OMP-MODL main power is ON extends this lifetime.

At any time, the approximate state of charge of the lithium cell can be

displayed on the LCD under the SYSTEM STATUS / SUPPLY VOLTAGES

menu or from a serially connected PC running HyperWare and a Status

Query command. For lithium cell replacement procedure, refer to Appendix

MLAD-1 MODULE

Overview

The MLAD-1 module contains the Analog to Digital converter, General

Purpose Digital Input channel circuitry, Cold Junction Compensation

circuitry, and four channels of analog input. This module plugs into the top

of the MLCPU-1 module (or MLIM-5 if so equipped) and is required in all

OMP-MODL systems.

ML006

LITHIUM CELL

BATTERY PIGTAIL & CONNECTOR

EPROM

EXTERNAL POWER FUSE

Figure 2... -7: Memory and RTC lithium battery location (bottom of

MLCPU-1)

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Omega-vehicle-security OMP-MODL Manuel d'utilisateur Page 20